Digital Camera Patent Abstract
A digital camera includes a connector for connecting another digital
camera and an interface for exchanging data between the digital
camera and another digital camera. When another digital camera is
connected to the connector, another digital camera is be controlled
by a controller via the interface. Digital Camera Patent Claims
What is claimed is:
1. A digital camera, comprising: a connector for connecting said
digital camera to another digital camera; an interface for exchanging
data between said digital camera and said another digital camera;
and a controller for controlling said another digital camera via
said interface when said another digital camera is connected to
said connector, wherein said controller controls a display provided
to said another digital camera so as to turn on/off the display
when the data exchange between said digital camera and said another
digital camera is executed.
2. The digital camera according to claim 1, further comprising
a display for displaying a controlling menu for said another digital
camera.
3. The digital camera according to claim 2, wherein said digital
camera displays a controlled result of said another digital camera
on said display at a first display mode and does not display a controlled
result of said another digital camera on said display at a second
display mode.
4. The digital camera according to claim 1, wherein said digital
camera transfers a photographed image data and its related data
to said another digital camera at a first transfer mode, and transfers
only the photographed image data at a second transfer mode.
5. The digital camera according to claim 1, wherein said interface
is an interface based on a USB (Universal Serial Bus) standard.
6. The digital camera according to claim 5, wherein said digital
camera is equipped with an upstream connector and a downstream connector
for connecting an external equipment via said interface, and wherein
said another digital camera is connected to said downstream connector.
7. The digital camera according to claim 1, wherein said digital
camera has a function for selecting a first control mode in which
said digital camera controls said another digital camera or a second
control mode in which said digital camera is controlled by said
another digital camera.
8. A digital camera, comprising: an interface based on a USB (Universal
Serial Bus) standard; first and second connectors for connecting
a plurality of external equipment via said interface; a detector
for detecting whether or not any of the plurality of external equipment
is connected to said first and second connectors; and a controller
for changing an operation of the digital camera based on the detected
results of the detector, wherein when the detector detects that
external equipment is connected to both said first and second connectors,
the controller sets the digital camera to operate as a hub of the
external equipment connected to both said first and second connectors,
and when the detector detects that external equipment is connected
to the second connector and not to the first connector, the controller
sets the digital camera to operate as a master controller of the
external equipment connected to the second connector.
9. The digital camera according to claim 8, wherein said first
and second connectors are upstream and downstream connectors, respectively
of said digital camera.
10. The digital camera according to claim 9, wherein the external
equipment to be connected to said downstream connector is anyone
of a digital camera, a modem and a printer.
11. The digital camera according to claim 9, wherein the external
equipment to be connected to said upstream connector is a computer
or a hub.
12. A digital camera, comprising: a connector for connecting said
digital camera to another digital camera, said another digital camera
having a power supply configure to supply power to said another
digital camera; an interface for exchanging data between said digital
camera and said another digital camera; and a controller for controlling
said another digital camera via said interface when said another
digital camera is connected to said connector, wherein said controller
controls said another digital camera so as to turn on/off a display
of said another digital camera and power continues to be supplied
to said another digital camera from said power supply when the display
is turned off by said controller.
13. The digital camera according to claim 12, further comprising
a display for displaying a controlling menu for said another digital
camera.
14. The digital camera according to claim 13, wherein said digital
camera displays a controlled result of said another digital camera
on said display at a first display mode and does not display a controlled
result of said another digital camera on said display at a second
display mode.
15. The digital camera according to claim 12, wherein said digital
camera transfers a photographed image data and its related data
to said another digital camera at a first transfer mode, and transfers
only the photographed image data at a second transfer mode.
16. The digital camera according to claim 12, wherein said interface
is an interface based on a USB (Universal Serial Bus) standard.
17. The digital camera according to claim 16, wherein said digital
camera is equipped with an upstream connector and a downstream connector
for connecting an external equipment via said interface, and wherein
said another digital camera is connected to said downstream connector.
Digital Camera Patent Description
The present invention claims a priority based on the Japanese Patent
Application No. H10-304421, the contents of which is incorporated
hereinto by reference in its entirety.
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to a digital camera which photoelectrically
converts an optical image of an object, which is taken by an image
taking lens, into analog signals by an image pick-up element and
generates digital image data by subjecting the analog image signals
to an image processing, more particularly to, a digital camera connectable
to another digital camera or a peripheral equipment.
2. Description of the Related Art
Conventionally, many proposals have been made to a digital camera
equipped with a host interface for connecting the digital camera
to a personal computer in order to transfer image data to the personal
computer as a host computer so as to process and/or store the image
data.
Recently, new standards of interface such as a USB (Universal Serial
Bus) or an IEEE 1394 have been proposed, and a digital camera utilizing
the aforementioned interface as a host interface has been provided.
Although these conventional interfaces are used to connect a host
computer to its peripheral equipment such as a printer, it has not
been considered that these conventional interfaces are used for
connecting digital cameras for transferring image data therebetween.
Originally, in the USB standard, a tree structure in which a host
computer is located at the summit thereof is constituted. Equipments
included in the structure except for the computer located at the
summit, are regarded as slave peripheral equipments which receive
instructions from the summit computer. Therefore, in a digital camera
connectable to a computer via a USB interface, like a digital camera
equipped with a conventional RS-232C serial interface, it was impossible
to control a peripheral equipment such as a printer connected to
the interface from the digital camera.
SUMMARY OF THE INVENTION
Therefore, it is an object of the present invention to provide
a convenient digital camera which can operate another digital camera
connected to the digital camera without relying on a host computer.
It is another object of the present invention to provide a convenient
digital camera which can operate a peripheral equipment such as
a modem or a printer connected to the digital camera without relying
on a host computer.
According to one aspect of the present invention, a digital camera
includes a connector for connecting the digital camera to another
digital camera, an interface for exchanging data between the digital
camera and another digital camera, and a controller for controlling
another digital camera via the interface when another digital camera
is connected to the connector.
According to the aforementioned digital camera, an operation such
as a data transfer between the digital camera and another digital
camera can be performed easily at the digital camera side without
relying on a software of a host computer, and the operation of another
digital camera can be controlled by the digital camera.
According to another aspect of the present invention, a digital
camera includes an interface based on a USB (Universal Serial Bus)
standard, first and second connecters for connecting a plurality
of external equipments via the interface, a detector for detecting
whether or not the external equipment is connected to the first
and second connector, and a controller for changing an operation
of the external equipment connected to the second connector based
on the detected result on whether or not the external equipment
is connected to the first connector.
According to this digital camera, by utilizing a USB interface,
which was only available for connecting the digital camera to a
host computer, the digital camera can directly control a peripheral
equipment such as a modem and/or a printer.
BRIEF DESCRIPTION OF THE DRAWINGS
The above and other objects, features, and advantages of the present
invention will be apparent from the following detailed description
of the preferred embodiments with reference to the attached drawings,
wherein:
FIG. 1 is a front view of the digital camera according to an embodiment
of the present invention;
FIG. 2 is a rear view of the digital camera shown in FIG. 1;
FIG. 3 is a bottom view of the digital camera shown in FIG. 1;
FIG. 4 is a block diagram showing the control system of the digital
camera shown in FIG. 1;
FIG. 5 is a block diagram showing a connection structure utilizing
an interface based on a USB standard;
FIG. 6 is an explanatory view of a connector for connecting a host
interface of a digital camera;
FIG. 7 is a perspective view showing the digital camera connected
to another digital camera via a cable;
FIG. 8 illustrates a screen showing a connection mode select menu
when a menu call key is operated;
FIG. 9 illustrates a screen showing a slave camera menu;
FIG. 10 illustrates a screen showing a master camera menu;
FIG. 11 illustrates a screen showing a master camera mode set menu;
FIG. 12 illustrates a screen showing a slave camera mode set menu;
FIG. 13 illustrates a screen showing a data transferring state
with comparing the master camera and the slave camera as one example
of a remote control mode of the master camera;
FIG. 14 illustrates a screen showing a data transferring state
with comparing the master camera and the slave camera as one example
of a normal mode of the master camera;
FIG. 15 illustrates a screen showing a data transferring state
with comparing the master camera and the slave camera as another
example of a normal mode of the master camera;
FIG. 16 is a flow chart showing a process for setting the digital
camera function by a menu;
FIG. 17 is a flow chart showing a process of the master camera
mode shown in FIG. 16;
FIG. 18 is a flow chart showing a process of a remote control mode
shown in FIG. 17;
FIG. 19 is a flow chart showing a process of a master normal mode
shown in FIG. 17;
FIG. 20 illustrates a block diagram showing one example in which
a digital camera and a host computer are connected each other; and
FIG. 21 illustrates a flow chart showing an operation mode set
process of the digital camera when another device is connected to
the digital camera.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
FIGS. 1 to 3 illustrate a digital camera according to one embodiment
of this present invention.
As shown in FIGS. 1 to 3, the digital camera 1 comprises a camera
frame, which is referred to as a main body 2, and a photographing
unit 3 which is attachable to and removable from the main body 2
on the right side of the main body 2 in the front view shown in
FIG. 1. The photographing unit 3 is rotatable within a plane parallel
to the right side of the main body 2.
The photographing unit 3 has a photographing device comprising
a macrozoom lens 301 and a photoelectric conversion device such
as a CCD (Charge Coupled Device) array, to convert the optical image
of an object into an electric image consisting of charge signals,
each of which was generated by each pixel of the CCD via photoelectric
conversion. The main body 2 has a display or LCD (Liquid Crystal
Display) 10, a slot 17 for receiving a memory card 8, and a connection
terminal 13 for connecting the digital camera 1 to a personal computer,
another digital camera, a modem, a printer or the like. The image
signal taken by the photographing unit 3 is subjected to a prescribed
image processing in the main body 2. The processed image is displayed
on the LCD display 10, recorded in the memory card 8 or transferred
to the personal computer, another digital camera, or the like. The
connection terminal 13 is comprised of two terminals which will
be explained later.
A macrozoom lens 301 is provided in the photographing unit 3. An
image pick-up circuit including a CCD color area sensor 303 is located
at an appropriate position behind the macrozoom lens 301. A light
adjusting circuit 304 having a light adjusting sensor 305 for receiving
flash light reflected from the object is provided at an appropriate
position in the photographing unit 3.
As shown in FIG. 1, a grip 4 is formed in the left-hand side of
the front face of the camera main body 2, and a built-in flash lamp
5 is provided in the right-hand upper side at an appropriate position.
Frame forwarding and backwarding switches 6 and 7 are provided near
the center of the top face of the main body 2 as shown in FIG. 1.
The forwarding switch 6 feeds the frame in the direction that the
frame number increases in the photographed order, and is referred
to as an UP key 6. The backwarding switch 7 feeds the frame in the
direction that the frame number decreases, and is referred to as
a DOWN key 7. A delete key D for deleting the images recorded in
the memory card 8 is provided on the left side of the DOWN key 7,
and a shutter button 9 is provided on the right side of the UP key
6 in the rear view shown in FIG. 2.
As shown in FIG. 2, an LCD 10 is provided in the middle of the
left-hand side of the rear face of the camera main body 2. The LCD
10 functions as a view finder during photographing, and as a display
during the reproduction of the recorded image.
Provided at the lower side of the LCD 10 is a compression rate
setting switch 12 for switching the compression rate K of the image
data to be recorded in the memory card 8. The compression rate setting
switch 12 is a slide switch, for example. The connection terminal
13 is provided on the side face of the main body 2 near the photographing
unit 3. A power switch PS and a operation menu call switch MENU
(also referred to as a "menu call key") are provided on
the top of the rear face of the main body 2.
The flash lamp (which may be abbreviated as "FL") of
the digital camera 1 has an "automatic flash mode", a
"forcible flash mode", and a "flash prohibition model".
In the "automatic flash mode", the built-in flash lamp
5 is automatically flashed according to the luminance of the object.
In the "forcible flash mode", the built-in flash lamp
5 is forcibly flashed regardless of the luminance of the object.
In the "flash prohibition mode", light emission of the
built-in flash lamp 5 is prohibited. Every time the user presses
the FL mode setting key 11 positioned above the LCD 10 on the rear
face of the main body 2, the flash mode is switched among three
modes in a cyclic order. The digital camera 1 has a 1/8 compression
rate and a 1/20 compression rate, and the user can select the preferred
compression rate K. For example, if the compression rate setting
switch 12 is shifted to the right, the compression rate K is set
to 1/8, and if it is shifted to the left, the compression rate K
is set to 1/20. Although, in this embodiment, the compression rate
K is set two modes, it may be set to three or more values.
A photographing/reproduction mode setting switch 14 is positioned
at the top right of the rear face of the main body 2. Digital pictures
are taken in the photographing mode. In the reproduction mode, the
digital images recorded in the memory card 8 are reproduced and
displayed on the LCD 10. The photographing/reproduction mode setting
switch 14 is also a bicontact slide switch. For example, if the
switch is shifted to the right, the reproduction mode is selected,
and if shifted to the left, the photographing mode is selected.
A battery cavity 18 and a slot 17 for receiving a memory card 8
are provided on the bottom face of the main body 2. The battery
cavity 18 and the slot 17 are covered with a clam-shell type cover
15. The digital camera 1 according to the embodiment has a power
supply source consisting of four AA batteries connected in series.
FIG. 4 is a block diagram of the control system of the digital
camera 1.
The CCD 303 in the photographing unit 3 photoelectrically converts
the optical image of the object focused by the macrozoom lens 301
into image signals of three color components R (red), G (green)
and B (blue), and outputs the image signals to the signal processor
313. This image signal consists of sequence of pixel signals received
by the respective pixels. A timing generator 314 generates various
timing pulses for controlling and driving the CCD 303.
Since the diaphragm of the photographing unit 3 is fixed, the exposure
of the photographing unit 3 is controlled by adjusting the quantity
of exposure of the CCD 303, that is, the charge accumulation time
of the CCD 303, which corresponds to the shutter speed. If the luminance
of the object is too low to select to an appropriate shutter speed,
the level of the image signal output from the CCD 303 is adjusted
in order to compensate for the insufficient exposure. In other words,
at a low luminance, the exposure is controlled by adjusting both
the shutter speed and the gain. The level of the image signal is
adjusted by controlling the gain of the AGC circuit in the signal
processor 313.
The timing generator 314 generates various driving control signals
for the CCD 303 based on the reference clock supplied from the timing
control circuit 202. The signals generated by the timing generator
314 includes a timing signal for starting and finishing integration
(i.e., exposure), and clock signals (horizontal synchronization
signals, vertical synchronization signals, transfer signals, etc.)
for controlling the reading timing of the light-receiving signals
from the respective pixels. These timing signals are supplied to
the CCD 303.
The signal processor 313 applies prescribed analogue signal processing
to the analog image signal output from the CCD 303. The signal processor
313 has a CDS (correlation double sampling) circuit for reducing
the noise of the image signal and an AGC (automatic gain control)
circuit for adjusting the level of the image signal by controlling
the gain of this AGC circuit.
The light-quantity adjusting circuit 304 sets the light emission
of the built-in flash lamp 5 to a predetermined level determined
by the general controller 211 when the flash lamp is used during
the photographing. During the flash photographing, the flash light
reflected from the object is received by the light-adjusting sensor
305 upon starting exposure. When the quantity of light received
by the sensor 305 reaches a predetermined level, the light-quantity
adjusting circuit 304 supplies a flash stop signal to the flash
control circuit 214 via the general controller 211. In response
to the flash stop signal, the flash control circuit 214 forcibly
stops the light emission of the built-in flash lamp 5, whereby the
light emission amount of the built-in flash lamp 5 can be regulated
to the prescribed level.
The A/D converter 205 provided in the main body 2 of the digital
camera 1 converts each pixel signal (i.e., analog signal) of the
image signal sequence into a 10-bit digital signal based on the
A/D conversion clock supplied from the A/D clock generator (not
shown).
A reference clock/timing generator 314 and a timing control circuit
202 are also provided in the main body 2. The timing control circuit
202 is controlled by the general controller 211.
A black level correction circuit 206 corrects the black level of
the digitalized pixel signal (hereinafter referred to as pixel data)
converted by the A/D converter 205 to the reference black level.
A white balance circuit (hereinafter referred to as WB circuit)
207 converts the level of the pixel data of each color component
of R, G or B, so that the white balance can be adjusted after .gamma.
(gamma) correction. The WB circuit 207 converts the level of the
pixel data of each color component R, G, B using a level conversion
table input from the general controller 211. The conversion coefficient
(or the slope of the characteristic line) for each color component
in the level conversion table is set each photographed image by
the general controller 211.
The .gamma. (gamma) correction circuit 208 corrects for the .gamma.
(gamma) characteristic of the pixel data. The .gamma. (gamma) correction
circuit 208 has, for example, six .gamma. (gamma) correction tables
with different .gamma. (gamma) characteristics, and uses the most
appropriate .gamma. (gamma) correction table according to the photographed
scene or the photographic conditions.
An image memory 209 stores the pixel data output from the .gamma.
(gamma) correction circuit 208. The memory capacity of the image
memory 209 corresponds to one frame data. Accordingly, if the CCD
303 has an n.times.m pixel matrix, the image memory 209 has a memory
capacity of n.times.m pixel data, and each pixel data is stored
in the corresponding pixel position in the memory.
A VRAM 210 is a buffer memory for storing the image data which
is to be reproduced and displayed on the LCD 10. The memory capacity
of the VRAM 210 corresponds to the number of pixels of the LCD 10.
In the photographing preparation mode, each pixel data of the image
taken by the photographing unit 3 every 1/30 seconds is subjected
to the prescribed signal processing by the sequence from the A/D
converter 205 to the .gamma. (gamma) correction circuit 208, and
stored in the image memory 209. This pixel data is simultaneously
transferred to the VRAM 210 via the general controller 211, and
displayed on the LCD 10. The user can recognize the photographed
object on the LCD 10. In the reproduction mode, the image read out
from the memory card 8 is subjected to the prescribed signal processing
by the general controller 211, which is then transferred to the
VRAM 210, and displayed on the LCD 10.
A card I/F 212 is an interface for writing the image data into
the memory card 8 or reading the image data from the memory card
8. A communication I/F 213 is an interface based on the USB standard,
or an interface for externally connecting an external equipment
such as a personal computer or another digital camera.
A flash control circuit 214 controls light emission of the built-in
flash lamp 5. In particular, the flash control circuit 214 controls
the quantity of flash light, flash timing, and so on, based on the
control signal supplied from the general controller 211. The flash
control circuit 214 also brings the light emission to zero based
on the flash stop signal STP input from the light-quantity adjusting
circuit 304.
An RTC (Real Time Clock) 219 is a time circuit for keeping the
track of the date and time of each photograph, which is driven by
a separate power source (not shown).
An operation unit 250 has switches corresponding to the UP key
6, the DOWN key 7, the shutter button 7, the FL mode setting key
11, the compression rate setting key 12, the photographing/reproduction
mode setting switch 14, and the operation menu call switch MENU.
The general controller 211 comprises a micro computer, and it organically
controls the driving timing of each element in the photographing
unit 3 and the main body 2 so as to generally control the photographing
operation of the digital camera 1. In a case where the digital camera
1 is connected to an apparatus such as another digital camera, a
printer, or a modem, the general controller 211 controls such apparatus.
Furthermore, in a case where a host computer or a hub is connected
to the digital camera at its upstream side, the general controller
211 functions as a hub for the downstream side apparatus.
In the photographing mode, if the shutter button 9 is pressed to
start photographing, the general controller 211 creates a thumb
nail image created from the image taken in the image memory 209
after the start of the photographing operation, and the compressed
image created by a JPEG method at the compression rate K when the
compression mode is selected by manipulating the compression rate
setting slide switch 12. A tag information (such as the frame number,
exposure value, shutter speed, compression rate K, photographing
date and time, flash ON/OFF data, scene information, image type,
judged result of the image, etc) stored in the memory card 8, the
compressed image and the thumb nail image are stored in the memory
card 8.
The memory card 8 can store forty frames of images taken by the
digital camera 1 at a 1/20 compression rate. Each of the frames
has tag information, high-resolution image data (640.times.480 pixels)
compressed by a JPEG method, and thumb nail image data (80.times.60
pixels). Each frame may be treated as an image file of EXIF type.
As mentioned above, in this embodiment, the aforementioned communication
I/F 213 is an interface based on a USB standard. The USB standard
has been developed for a medium speed interface for connecting a
peripheral apparatus of a personal computer, and has drawn attention
to an interface available for a hot-connection by a Plug-And-Play.
The USB standard has a connection structure as shown in FIG. 5,
the personal computer 21 located at the summit of the tree-structure
takes the initiative as a host, and controls a corresponding peripheral
equipment such as a printer 41A, a key board 41B via an upstream
hub 31A. Furthermore, the personal computer 21 controls a corresponding
peripheral equipment such as a joy stick 41C via a downstream hub
31B, and also controls a peripheral equipment such as a mouse 41D
via the aforementioned peripheral equipment 41B.
As it is understood from the above, in the USB interface, only
the host computer 21 located at the summit of the tree-structure
controls each of the peripheral equipments. For example, in the
example shown in FIG. 5, it is impossible for the mouse 41D itself
to directly control the printer 41A. The host computer 21 detects
the operation of the mouse 41D, and controls the printer 41A depending
on the detected results.
Conventionally, the digital camera 1 was treated as a peripheral
equipment of the host computer 21, and was controlled by the host
computer 21 depending on the instruction of the host computer 21
or the detected results.
However, in the USB interface, an equipment located at the summit
of the tree-structure is not limited to the host computer 21. As
mentioned above, since the general controller 211 of the digital
camera 1 is equipped with a micro computer, the digital camera 1
can act as a host computer if a driver software for the USB interface
is installed in the micro computer.
In this embodiment, the digital camera 1 can act as a host computer
along the USB interface standard (master camera mode), and also
can act as a peripheral equipment (slave camera mode) by the switch
operation which will be mentioned later.
In the digital camera 1 according to this embodiment, the connection
terminal 13 having the upstream connector 13A and the downstream
connector 13B is connected to the communication I/F 213. The upstream
connector 13A is used for connecting the host computer 21 or a hub
31A, and the downstream connector 13B is used for connecting another
digital camera or other peripheral equipments 41. In this embodiment,
a personal computer is used as a host computer.
In the digital camera 1 according to this embodiment, in a state
that a host computer or another digital camera is connected to the
connection terminal 13 of the camera main body 2, it is possible
to call a camera function by pressing the menu call key MENU, and
is also possible to set the camera function depending on the called
menu. When the menu call key MENU is pressed, as shown in FIG. 8,
the connection mode select menu is displayed on the LCD display
10. The menu can be selected by shifting the arrow by using the
UP switch 6 and the DOWN switch 7. After the selection of the menu,
when the shutter button 9 is depressed, the selected function is
set.
Following is an explanation of the operation of the digital cameras
in a case where the digital camera 1 and another digital camera
1' are connected each other via a cable CBL as shown in FIG. 7.
First, the downstream connector 13B of the digital camera 1 and
the upstream connector 13A of another digital camera 1' are connected
each other via a cable CBL, and both the digital cameras 1 and 1'
are activated by depressing the respective power switch PS.
Thereafter, in each digital camera 1 and 1', the menu call key
MENU is depressed to call the connection mode select menu shown
in FIG. 8, and one of the digital camera 1 is set to be a master
camera mode, and the other is set to be a slave camera mode. In
this specification, the digital camera 1 set to be a master camera
mode is referred to as a master camera (i.e., a camera which controls
the other camera) and the digital camera 1' set to be a slave camera
mode is referred to as a slave camera (i.e., a camera which is controlled
by the other camera).
After the completion of the setting of both of the cameras 1 and
1', all switch operation of the slave camera 1' except for the menu
call key MENU and the power switch PS becomes invalid, and all switch
operations will be dominated by the master camera.
When the menu call key MENU of the slave camera 1' is depressed,
a menu shown in FIG. 9 is displayed. In this state, when the shutter
button 9 is depressed, the slave mode is released (OFF).
On the other hand, when the menu call key MENU of the master camera
1 is depressed, as shown in FIG. 10, a master camera menu is displayed.
In this state, the camera setting of the connected cameras can be
changed.
According to the communication system in which these digital cameras
1 and 1' are used, an operation such as a data transfer between
the two digital cameras can easily be performed by a single digital
camera 1 without using an application software of a host computer
or a peripheral equipment. Furthermore, the use can control the
operation of the other digital camera, which results in a simple
operation.
In a master camera menu shown in FIG. 10, after the selection of
the "master camera setting" by using the UP switch 6 or
the DOWN switch 7, when the shutter button 9 is depressed, the mode
set menu of the master camera is displayed as shown in FIG. 11.
In this menu, the following three modes are available. (1) Normal
Mode:
In this mode, the camera functions as a normal master camera, and
the results of the switch operation of the master camera are shown
on the LCD display 10 of this master camera. (2) Remote Control
Mode:
In this mode, the master camera 1 is used as a remote controller
of the slave camera 1'. Each of the key operations of the master
camera 1 corresponds to the corresponding key operation of the slave
camera 1' except for the menu call key MENU.
For example, as shown in FIGS. 13A and 13B, when the UP switch
6 of the master camera 1 is depressed, the images of both cameras
are forwarded as if the UP switch of the slave camera 1' were depressed.
In this mode, the LCD display 10 of the master camera 1 is turned
off (OFF). When the menu call key MENU is depressed, the master
camera menu as shown in FIG. 10 is displayed. (3) Monitor Remote
Control Mode:
Similar to the aforementioned remote control mode, in this mode,
the master camera 1 is used as a remote controller of the slave
camera 1'. For example, as shown in FIGS. 13C and 13D, when the
UP switch 6 of the master camera 1 is depressed, the images of both
cameras are forwarded as if the UP switch of the slave camera 1'
were depressed. However, in this mode, the LCD display 10 of the
master camera 1 displays the same image as that displayed on the
LCD display of the slave camera 1'.
In the master camera menu shown in FIG. 10, after the selection
of the "slave camera setting" by using the UP switch 6
or the DOWN switch 7, when the shutter button 9 is depressed, the
"mode set menu" of the slave camera shown in FIG. 12 is
displayed.
In this menu, the use can select one of the five modes of the slave
camera 1' from the master camera 1 side. (1) Slave mode OFF
In this mode, the slave mode of the current slave camera 1' is
released so that the slave camera can be used as a normal camera.
The selection of this mode can be made regardless of the set mode
(Normal mode, Remote Control Mode, or Monitor Remote Control Mode)
of the master camera 1. (2) Normal LCD ON Mode:
This mode is a normal slave mode, and is mainly used for exchanging
the images between the digital cameras.
For example, in a case where an image is transferred between the
master camera 1 and the slave camera 1', as shown in FIGS. 14A and
14B, the image transferred from the master camera 1 is displayed
on the display of the slave camera 1' after the completion of transfer.
If the master camera 1 is in a remote control mode or in a monitor
remote control mode, the user cannot select this menu. (3) Normal
LCD OFF mode:
This mode is a normal slave mode, and is mainly used for exchanging
the images between the digital cameras.
The difference between this mode and the aforementioned normal
LCD ON mode is that the LCD display 10 of the slave camera is turned
off. Thus, the transferred image is not displayed. If the master
camera 1 is in a remote control mode or in a monitor remote control
mode, the user cannot select this menu. (4) Monitor Mode:
In this monitor mode, as shown in FIGS. 15A and 15B, the slave
camera 1' acts as a monitor apparatus for displaying the same screen
as that of the master camera 1. If the master camera 1 is in a remote
control mode or in a monitor remote control mode, the user cannot
select this menu. (5) Presentation Mode:
This mode is almost the same mode as in the aforementioned monitor
mode. In this mode, the salve camera 1' acts as a monitor apparatus
of the master camera 1. However, unlike in the monitor mode, as
shown in FIGS. 15C and 15D, only the image data is displayed on
the LCD display 10 of the slave camera 1'. If the master camera
1 is in a remote control mode or in a monitor remote control mode,
the user cannot select this menu.
Next, the method for transferring the image will be explained.
The image will be transferred from the master camera 1 to the slave
camera 1'. After the selection of the image to be transferred by
operating the UP switch 6 and the DOWN switch 7 of the master camera
1, when the shutter button 9 is depressed, the selected image will
be transferred to the slave camera 1'. In this case, if the LCD
display 10 of the slave camera 1' is turned on, the transferred
image is displayed on the LCD display 10 of the slave camera 1'
after the completion of the transfer.
Next, the steps for setting the camera function by operating the
menu call switch MENU will be explained with reference to the flow
chart shown in FIG. 16.
In the following explanation, "Step", "YES"
and "No" will be referred to as "S", "Y"
and "N", respectively.
When MENU key is depressed, the connection mode select menu shown
in FIG. 8 is displayed in S101, and it is judged if the "host
connect mode" is selected in S102. If the "host connect
mode" is selected (Y in S102), the "host connect mode"
is set (S105).
If the "host connect mode" is not selected (N in S102),
it is judged whether or not the "master camera mode" is
selected in S103. If the "master camera mode" is selected
(Y in S103), the "master camera mode" is set (S106).
If the "master camera mode" is not selected (N in S103),
it is judged whether or not the "slave camera mode" is
selected in S104. If the "slave camera mode" is selected
(Y in S104), the "slave camera mode" is set (S107). If
the "slave camera mode" is not selected (N in S104), the
routine returns to S102.
Next, the process in the "master camera mode" will be
explained with reference to the flow chart shown in FIG. 17.
First, in S201, the operation prohibit command is transmitted to
the slave camera 1', and the master camera menu shown in FIG. 10
is displayed on the LCD display of the master camera 1 in S202.
In S203, it is judged whether or not the "master camera setting"
is selected. If the "master camera setting" is selected
(Y in S203), it is judged whether or not the "normal mode"
is selected in S205. If the "master camera setting" is
not selected (N in S203), it is judged whether or not the "slave
camera setting" is selected in S204. If the "slave camera
setting" is not selected (N in S204), the routine returns to
S201.
In a case where the "master camera setting" is selected,
if the "normal mode" is selected (Y in S205), the camera
is set to be a master normal mode in S206, and the command for transferring
to the normal LCD ON mode is transmitted to the slave camera 1'
(S207). Thus, the master camera is set to be a normal mode state
(S208).
If the aforementioned "normal mode" is not selected (N
in S205), it is judged whether or not the "remote control mode"
is selected in S209. If the "remote control mode" is selected
(Y in S209), the display of the master camera is turned off (S210)
and the routine proceeds to the remote control mode (S211).
If the "remote control mode" is not selected (N in S209),
it is judged whether or not the "monitor remote control mode"
is selected in S212. If the "monitor remote control mode"
is selected (Y in S212), the current displayed image data is obtained
from the slave camera 1' (S213), and the obtained image data is
displayed on the LCD display 10 (S214). Then, the routine proceeds
to the remote control mode (S215).
If the "monitor remote control mode" is not selected
(N in S212), the routine returns to S205.
In S204, if the "slave camera setting" is selected (Y
in S204), it is judged whether or not the "normal LCD ON mode"
is selected in S216. If the "normal LCD ON mode" is selected
(Y in S216), the LCD ON command is transmitted to the slave camera
1' in S217. Then, the master camera is set to be a normal mode state
(S218).
If the "normal LCD ON mode" is not selected (N in S216),
it is judged whether or not the "normal LCD OFF mode"
is selected in S219. If selected (Y in S219), the LCD OFF command
is transmitted to the slave camera 1' in S220. Then, the master
camera is set to be a normal mode state (S221).
If the "normal LCD OFF mode" is not selected (N in S219),
it is judged whether or not the "monitor mode" is selected
in S222. If the "monitor mode" is selected (Y in S222),
the LCD ON command and all current display information of the master
camera 1 are transmitted to the slave camera 1' (S223). Then, the
master camera is set to be a normal mode state (S224).
If the "monitor mode" is not selected (N in S222), it
is judged whether or not the "presentation mode" is selected
in S225. If the "presentation mode" is selected (Y in
S225), the LCD ON command and only the current display image of
the master camera 1 are transmitted to the slave camera 1' (S226).
Then, the master camera 1 is set to be a normal mode state (S227).
If the "presentation mode" is not selected (N in S225),
it is judged whether or not the "slave mode release" is
selected in S228. If the "slave mode release" is selected
(Y in S228), the slave release command is transmitted to the slave
camera 1' (S229). If the "slave mode release" is not selected
(N in S228), the routine returns to S216.
Next, the process in the remote control mode will be explained
with reference to the flow chart shown in FIG. 18.
First, in S301, an operation of the input key such as an UP/DOWN
switch is waited. If the input key is operated, the command corresponding
to the pressed key is transmitted to the slave camera 1' in S302.
In S303, it is judged whether or not it is in the "monitor
remote control mode". If it is in the "monitor remote
control mode" (Y in S303), the display data request command
is transmitted to the slave camera 1' in S304. In S305, the transferred
contents from the slave camera 1' is displayed on the LCD display
10. If it is not the "monitor remote control mode" (N
in S303), the routine returns to S301.
Next, the process in the normal mode will be explained with reference
to the flow chart shown in FIG. 19.
In S401, it is judged whether or not the image is transmitted.
If the image is transmitted (Y in S401), the next image is read
out from the memory card in S402, and the image is displayed on
the LCD display 10 in S403.
In S404, it is judged whether or not the slave camera 1' is in
the "monitor mode" in S404. If it is in the "monitor
mode" (Y in S404), all of the information on the master camera
is transmitted to the slave camera 1' in S405, and the routine returns
to S401.
If the slave camera 1' is not in the "monitor mode" (N
in S404), it is judged whether or not the slave camera 1' is in
the "presentation mode" in S406. If it is in the "presentation
mode" (Y in S406), the image on the master camera 1 is transmitted
to the slave camera 1' in S407. Then, the routine returns to S401.
Even if the slave camera 1' is not in the "presentation mode"
(N in S406), the routine returns to S401.
In S401, if the image is not transmitted (N in S401), it is judged
whether or not the image transfer button is depressed in S408. If
the image transfer button is depressed (Y in S408), the image data
is transferred to the slave camera 1' in S409. In S410, it is judged
whether or not it is in the "normal LCD ON mode." If it
is in the "normal LCD ON mode" (Y in S410), the image
display command is transmitted in S411. If it is not in the "normal
LCD ON mode" (N in S410), the routine returns to S410. If the
image transfer button is not depressed (N in S408), the routine
also returns to S401.
Next, a second embodiment of the present invention will be explained
as follows.
In this embodiment, the digital camera 1 is connected to a host
computer 21. As shown in FIG. 20, the upstream connector 13A is
connected to the USB terminal of the host computer 21 or to the
downstream connector of the hub 31A.
Various kinds of USB standard peripheral apparatus such as a modem
41D, the printer 41A or another digital camera can be connected
to the downstream connector 13B of the digital camera 1. In this
case, the host computer recognizes this digital camera 1 as a peripheral
equipment 41B with a hub.
As mentioned above, in cases where digital cameras 1 and 1' are
connected each other, or a printer or a modem is directly connected
to the digital camera 1, no apparatus is connected to the connector
13A, and another digital camera 1', the printer 41A or the modem
41D is connected to the connector 13B. In this case, the digital
camera 1 functions the same as the host computer 21 and controls
the peripheral equipments such as another digital camera 1', the
printer 41A, and/or the modem 41D connected to the connector 13B.
Next, the operation mode set steps in the second embodiment will
be explained with reference to the flow chart shown in FIG. 21.
First, in S501, the connection status of the terminal 13 of the
digital camera 1 is detected. And it is judged whether or not the
upstream terminal 13A is connected in S502. If the upstream terminal
13A is connected by a device (Y in S502), it is judged whether or
not the downstream terminal 13B is connected.
If the downstream terminal 13B is connected by a device (Y in S503),
since the upstream connector and the downstream connector are connected
by devices, the digital camera 1 sets itself as a hub in S505. In
S506, other processing 1 as a hub is performed. In this embodiment,
the data transferred from the upstream side is transferred to the
downstream side, and vice versa. Thereafter, the routine returns
to S501.
On the other hand, in S502, if the upstream terminal 13A is not
connected by a device (N in S502), it is detected if the downstream
terminal 13B is connected in S507.
If the downstream terminal 13B is connected by a device (Y in S507),
since only the downstream terminal 13B is connected by the device,
the digital camera sets itself as a host computer for the downstream
devices in S508, and then inquires the type of the device connected
to the downstream terminal.
In S512, if it is judged that the type of the device connected
to the downstream terminal 13B is a printer, after detecting the
operation in S513, the data is transferred to the printer 41A from
the digital camera 1 in S514. Then, in S515, other processing 3
required when the printer is connected is performed. In S512, if
it is judged that the type of the device connected to the downstream
terminal 13B is a modem 41D, after detecting the operation in S516,
the data is transferred to the modem 41D from the digital camera
1 in S517. Then, in S518, other processing 4 required when the modem
is connected is performed. Thereafter, the routine returns to S501.
In cases where the upstream terminal 13A is connected by a device
(Y in S502) or is not connected by any device (N in 502), if the
downstream terminal 13B is not connected by a device (N in S503,
and N in S507), the digital camera 1 sets itself as a digital camera
in S509. Then, in S510, other processing 2 (known processing of
a digital camera). Thereafter, the routine returns to S501.
In a case where the digital cameras are connected each other and
the display controls are performed in accordance with their operations,
these digital cameras may be connected via an IEEE 1394 interface.
As mentioned above, according to the embodiment, in a case where
a digital camera is connected by another digital camera, the operation
thereof can easily be performed by a single digital camera, and
one of the digital cameras can control the other digital camera,
resulting in an easy operation.
Furthermore, in a case where the upstream and downstream connectors
for connecting external apparatuses by an interface based on the
USB standard, and the downstream connector is to be connected by
another digital camera, it becomes possible to control another digital
camera by using an interface based on the USB standard.
According to the digital camera characterized in that an upstream
and downstream connectors for connecting external apparatuses at
an interface based on the USB standard, and the digital camera functions
as a host computer of an apparatus such as a digital camera, a modem,
or a printer to be connected to the downstream connector when the
upstream connector is not connected by a device, a direct control
not only between digital cameras but also between a digital camera
and a modem, or a printer, by utilizing a USB interface which could
only be used for connecting the digital camera to the host computer.
According to the digital camera characterized in that an upstream
and downstream connectors for connecting external apparatuses by
an interface based on the USB standard, and the digital camera operates
as a hub of a device connected to the downstream connector when
the upstream connector is connected by a computer or a hub, a normal
tree-structure in which a USB interface is used can be obtained.
Thus, an apparatus connected to the downstream connector can be
controlled by the computer.
The terms and descriptions in this specification are used only
for explanatory purposes and the present invention is not limited
to these terms and descriptions. It should be appreciated that there
are many modifications and substitutions without departing from
the spirit and the scope of the present invention which is defined
by the appended claims.
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