Digital Camera Patent Abstract
A digital camera includes an interface connected with a memory card.
To the memory card is recorded an image file including a compressed
main-image data and compressed thumbnail image data of a subject
taken. When the operator selects a transmit mode and performs predetermined
key operation, the image file recorded on the memory card is transmitted
to an Internet server via a communication circuit. After completing
the transmission, the image files already transmitted are erased
leaving the compressed thumbnail image data. Digital Camera Patent Claims
What is claimed is:
1. A digital camera for recording to a recording medium an image
file including a main-image and a size-reduced image which correspond
to a subject taken, comprising: a first transmitter for transmitting
to an external storage device the image file recorded in said recording
medium; an eraser for erasing from said recording medium the image
file transmitted by said first transmitter except for the size-reduced
image; a displayer for displaying the size-reduced image(s) remaining
in said recording medium when a display operation is carried out;
a receiver for receiving, when a desired image is selected from
among the size-reduced image(s) displayed by said displayer, the
image file including the desired size-reduced image from said external
storage device; and a recorder for recording to said recording medium
the image file received by said receiver.
2. A digital camera according to claim 1, wherein said eraser includes
a size-reduced image extractor for extracting the size-reduced image
from the image file, a file eraser for erasing the image file after
an extracting process of the size-reduced image extractor, and a
size-reduced image recorder for recording to said recording medium
the size-reduced image extracted by said size-reduced image extractor.
3. A digital camera according to claim 1, further comprising an
image file selector for selecting a desired image file from said
recording medium, wherein said first transmitter transmits the desired
image file, and said eraser erases from said recording medium the
desired image file except for the size-reduced image included in
the desired image file.
4. A digital camera according to claim 1, further comprising an
adder for adding to the image file print-job information which requests
a printing operation, prior to transmitting the image file.
5. A digital camera according to claim 1, further comprising: a
detector for detecting a relationship in magnitude between a vacant
capacity of said external storage device and a size of the image
file to be transmitted; and a second transmitter for transmitting
an extension request for the vacant capacity to said external storage
device based on a result of detection by said detector, wherein
said first transmitter transmits the image file after the vacant
capacity has been extended in response to the extension request.
6. A digital camera according to claim 1, further comprising: a
prompter for prompting the vacant capacity to extend when the vacant
capacity is lower than the size; and an instructor for instructing
an extension of the vacant capacity, wherein said second transmitter
transmits the extension request in response to an instruction by
said instructor.
7. A digital camera according to claim 6, wherein the capacity
of said external storage device is on sale on a predetermined-size
basis, and the instruction of said instructor is an instruction
for purchasing a capacity of the predetermined size.
Digital Camera Patent Description
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to a digital camera for storing and accumulating
taken-image data into a high-capacity server remotely located through
the Internet so that desired image data can be, as required, downloaded
from the server.
2. Description of the Prior Art
In the digital camera, the subject image taken by an imager device,
such as a CCD imager, is subjected to predetermined signal processing.
This produces still image data to be recorded in a compressed state
onto a removable recording medium. When a reproduce mode is set,
still image data is reproduced from the recording medium and outputted
onto a LCD monitor through the decompression process. For such digital
cameras, various recording mediums are used, including memory cards
incorporating a flash memory having a capacity of approximately
several tens of M bytes, floppy disks, small-sized hard disks, magneto-optical
disks having a capacity of approximately several hundreds of M bytes,
etc. These mediums are on rapid increase in their capacity. Today,
they can store increased amount of image data as compared to that
several years before.
However, the data size of one still picture has increased with
recent increase of pixel count of the CCD-imager. Meanwhile, the
speed increase of signal processing has enabled to take a motion
image. As a result, the total data amount of an image to be recorded
to the recording medium has also drastically increased. The user
who is to take a picture is required to be conscious of if sufficient
vacant capacity is available in the recording medium.
SUMMARY OF THE INVENTION
Therefore, it is a primary object of the present invention to provide
a digital camera capable of taking subjects without paying attentions
to the memory capacity.
According to the present invention, a digital camera for recording
to a recording medium an image file including a main-image signal
and a size-reduced image signal of a subject taken comprises: a
first transmitter for transmitting a plurality of the image files
recorded in the recording medium to an external storage device;
an eraser for erasing from the recording medium the plurality of
image files transmitted by the first transmitter; a first receiver
for receiving a plurality of the size-reduced image signals from
the external storage device; a selector for selecting a desired
size-reduced image signal from among the plurality of size-reduced
image signals received by the first receiver; and a second receiver
for receiving from the external storage device the image file including
the desired size-reduced image signal selected by the selector.
An image file including a main-image signal and a size-reduced
image signal of a subject taken is recorded to the recording medium.
The image files recorded are transmitted to the external storage
device by the first transmitter. The image files transmitted are
erased from the recording medium by the eraser. A plurality of the
size-reduced image signals are received from the external storage
device by the first receiver. If a desired size-reduced image signal
is selected from among the plurality of size-reduced image signals
received by the selector, the second receiver receives from the
external storage device the image file including the desired size-reduce
image signal selected.
Because the image files recorded in the recording medium are transmitted
to the external storage medium, the operator is allowed to continue
to take pictures without paying attention to the capacity of the
recording medium. Also, because the already-transmitted image files
are erased by the eraser, it is possible to omit the labor and time
that the operator manually transmits image files. Furthermore, a
desired size-reduced image signal is selected from among the size-reduced
image signals received from the external storage device whereby
a corresponding image file is received. Accordingly, the image file
can be easily restored to hand.
In one embodiment of the invention, the first receiver includes
a date inputter, a date information transmitter and a size-reduced
image signal receiver. If a date inputter to inputs a desired date,
a date information transmitter transmits date information representative
of the desired date to the external storage device. Thereupon, a
size-reduced image signal receiver receives from the external storage
device the plurality of size-reduced image signals generated on
the desired date.
In another embodiment of the invention, the selector includes a
displayer. The displayer displays a plurality of size-reduced images
based on the plurality of size-reduced image signals received by
the first receiver. A size-reduced image selector selects a desired
size-reduced image from among the plurality of size-reduced images
displayed by the displayer.
According to the invention, a digital camera for recording to a
recording medium an image file including a main-image signal and
a size-reduced image signal of a subject taken comprises: a transmitter
for transmitting to an external storage device the image file recorded
in the recording medium; a storage for storing in a nonvolatile
memory area the size-reduced image signal included in the image
file transmitted by the transmitter; and an eraser for erasing from
the recording medium the image file transmitted by the transmitter.
The recording medium records an image file including a main-image
signal and a size-reduce image signal of a subject taken. When a
transmitter transmits to an external storage device the image file
recorded in the recording medium, a storage stores in a nonvolatile
memory area the size-reduced image signal included in this image
file. Also, an eraser erases from the recording medium the image
file transmitted.
Because the image files recorded in the recording medium is stored
in the externally provided storage device in this manner, the operator
can continue to take pictures without paying attention to the capacity
of recording medium. Also, the transmitted image files are erased
leaving size-reduced image signals, it is possible for the operator
to omit the labor and time of manually erasing the image files.
Further, the content of the image files stored in the external storage
device can be easily confirmed by the size-reduced image signals.
In one embodiment of the invention, an image file selector is further
provided to select a desired image file from among a plurality of
the image files recorded in the recording medium. In this case,
the transmitter transmits the desired image file and the storage
stores in the memory area the size-reduced image signal included
in the desired image file. The eraser erases from the recording
medium the desired image file.
In another embodiment of the invention, when a reproducer for reproducing
a plurality of the size-reduced image signals stored in the memory
area, a displayer displays a plurality of size-reduced images based
on the plurality of size-reduced image signals reproduced by the
reproducer. When a size-reduced image selector selects a desired
size-reduced image from among the plurality of size-reduced images
displayed, a receiver receives from the external storage device
the image file corresponding to the size-reduced image selected.
In still another embodiment of the invention, an adder adds print-job
information to the image file prior to transmitting the image file.
In yet another embodiment of the invention, the nonvolatile memory
area is formed in the recording medium.
According to the invention, a digital camera for transmitting to
an external storage device an image signal of a subject taken comprises:
a detector for detecting a relationship in magnitude between a vacant
capacity of the external storage device and a size of the image
signal; a first transmitter for transmitting an extension request
for the vacant capacity to the external storage device based on
a result of detection by the detector; and a second transmitter
for transmitting the image signal to the external storage device
after the vacant space bas been extended in response to the extension
request.
The image signal of a subject taken by the digital camera is sent
to the external storage device. The relationship in magnitude between
the vacant capacity of the external storage medium and the to-be-transmitted
image signal is detected by the detector. The first transmitter
transmits a vacant-capacity extension request to the external storage
device based on a result of detection by the detector. If the vacant
capacity is extended in response to the extension request, the second
transmitter transmits the image signal to the external storage device.
Because the vacant capacity of the external storage medium is extended
based on a relationship in magnitude of the vacant capacity of the
external storage medium and the to-be-transmitted image signal,
the operator is allowed to continue to take pictures without conscious
of the vacant capacity of the external storage device.
In one embodiment of the invention, a prompter prompts the vacant
capacity to extend when the vacant capacity is lower than the size.
Here, if an instructor instructs an extension of the vacant capacity,
the first transmitter transmits the extension request in response
to an instruction by the instructor.
Preferably, the capacity of the external storage device is on sale
on a predetermined-size basis and the instruction of the instructor
is an instruction for purchasing a capacity of the predetermined
size.
The above described objects and other objects, features, aspects
and advantages of the present invention will become more apparent
from the following detailed description of the present invention
when taken in conjunction with the accompanying drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a block diagram showing one embodiment of the present
invention;
FIG. 2 is a flowchart showing one part of operation of the FIG.
1 embodiment;
FIG. 3 is a flowchart showing another part of operation of the
FIG. 1 embodiment;
FIG. 4 is a flowchart showing still another part of operation of
the FIG. 1 embodiment;
FIG. 5 is a flowchart showing yet another part of operation of
the FIG. 1 embodiment;
FIG. 6 is a flowchart showing one part of operation of another
embodiment of the invention;
FIG. 7 is a flowchart showing another part of the other embodiment
of the invention;
FIG. 8 is a flowchart showing part of operation of still another
embodiment of the invention;
FIG. 9 is a flowchart showing another part of operation of the
other embodiment of the invention;
FIG. 10 is a flowchart one part of operation of still another embodiment
of the invention;
FIG. 11 is an illustrative view showing an example of a password
input screen;
FIG. 12 is an illustrative view showing one example of a mode select
screen.
FIG. 13 is an illustrative view showing one example of a purchase
query screen;
FIG. 14 is an illustrative view showing an example of an image-file
storage reject screen;
FIG. 15 is an illustrative view showing an example of a group select
screen; and
FIG. 16 is an illustrative view showing an example of a print-job
information input screen.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
Referring to FIG. 1, a digital camera of this embodiment includes
a system controller 38. The system controller 38 is to be selected
in a still-picture taking mode by a taking-mode select switch 42
and, at operating a release button 40, supplies a corresponding
key state signal to a CPU 32. Thereupon, the CPU 32 starts up a
picture-taking system including a CCD imager 10, a CDS/AGC circuit
12, an A/D converter 14, a signal processing circuit 16 and a thumbnail
creator circuit 18.
The CCD imager 10 performs photoelectric conversion on a subject
optical image given through a lens (not shown) to produce image
signals (electric charges) and outputs the produced image signals
by the raster-scan scheme. The output image signal is removed of
noise and adjusted in level by the CDS/AGC circuit 12 and converted
into image data (digital signal) by the A/D converter 14. The signal
processing circuit 16 performs signal processing, such as color
separation and YUV conversion, on the image data and creates image
data (main-image data) comprising luminance data and two kinds of
color-difference data. The produced main-image data is delivered
to a memory control circuit 22 via a bus 20 and stored in a main-image
storage area 24a of an SDRAM 24 by the memory control circuit 22.
The main-image data produced by the signal processing circuit 16
is also supplied to the thumbnail creator circuit 18. The thumbnail
creator circuit 18 performs thinning-out on the supplied main-image
data to produce thumbnail image data and sends the created thumbnail
image data to the memory control circuit 22 through the bus 20.
The thumbnail image data is then stored to a thumbnail image storage
area 24b by the memory control circuit 22.
The CPU 32 disables the picture-taking system at a time that the
thumbnail image data has been stored in the SDRAM 24, and in turn
supplies a main-image compressing command and thumbnail compressing
command to the image compression/decompression circuit 30. A main-image
compressing command is first outputted. The image compression/decompression
circuit 30 reads out main-image data stored in the main-image storage
area 24a through the memory control circuit 22 and conducts image
compression confirming to the JPEG format. The compressed main-image
data produced by the compression process is stored to a compressed
main-image storage area 24c of the SDRAM 24 through the memory control
circuit 22. Subsequently, when a thumbnail compressing command is
outputted, the image compression/decompression circuit 30 reads
out the thumbnail image data stored in the compressed thumbnail
image storage area 24d through the memory control circuit 22 and
performs JPEG compression similarly to the above. This produces
compressed thumbnail image data to be stored in a compressed-thumbnail-image
storage area 24d of the SDRAM through the memory control circuit
22.
Obtaining the compressed main-image data and compressed thumbnail
image data as above, the CPU 32 reads out these of compressed data
through the memory control circuit 22 and records them as still
image files to a memory card 34. Here, the compressed thumbnail
image data serves as index information for the still picture files.
Also, the still picture file at its header is given a file name,
a picture taking date and an escape identifier representative of
a JPEG file.
Incidentally, the memory card 34 is a nonvolatile recording medium
to be removably loaded in the digital camera, which in actual is
connected to the bus 20 through an interface.
Meanwhile, in a state that a motion-picture taking mode is selected
by the taking-mode select switch 42, when the release button 40
is pressed, the CPU 32 continues starting up the picture-taking
system over a time the release button 40 is being pressed and repeatedly
supplies main-image compressing commands at an interval of 1/15th
of a second to the image compression/decompression circuit 30. The
CCD imager 10 outputs frames of image signals, for example, at an
interval of 1/15th of a second, and the main-image data stored in
the main-image storage area 24a is updated at an interval of 1/15th
of a second. It should be however noted that, because the thumbnail
creator circuit 18 is disabled at a time that a first frame of thumbnail
image data has been produced, the first frame of thumbnail image
data stored in the thumbnail image storage area 24b will not be
updated by the following thumbnail image data.
The image compression/decompression circuit 30 compresses the main-image
data in response to a compressing command, in a manner similarly
to the above. The main-image data stored in the main-image storage
area 24a is sequentially subjected to compression processing. The
frames of compressed main-image data are successively accumulated
to the compressed main-image storage area 24c of the SDRAM 24. When
the release button is released from depression, the CPU 32 sends
a thumbnail image compressing command to the image compression/decompression
circuit 30. Thereupon, the image compression/decompression circuit
30 compresses the thumbnail image data in a manner similar to the
above, and stores the compressed thumbnail image data to the compressed
thumbnail image storage area 24d.
After obtaining a plurality of frames of compressed main-image
data and one frame of compressed thumbnail image data, the CPU 32
records these of compressed data as motion-picture files (motion
JPEG files) to the memory card 34. The compressed thumbnail image
data, even if in a motion image file form, serves as index information.
Also, to the header of the motion image file is given a file name,
a picture-taking date and an escape identifier (MOV) representative
of a motion image file.
By the repetition of taking still or motion images as above, still
or motion image files are accumulated up within the memory card
34 and the vacant capacity is correspondingly decreased in the memory
card 34. In order for restoration from the vacant capacity inside
the memory card 34, the operator may operate a file-transmit key
46. This causes a communication circuit 36 having a data-communication
function as that of a portable communication terminal to make dialing
to an Internet service provider 50. When a connection is once established,
a URL of a data base server (external memory device) 52 is transmitted
over the Internet thereby getting an access to the server 52 through
the provider 50. Once the access to the server 52 becomes available,
the still or motion image files accumulated on the memory card 34
can be sent to the server 52 by operator's predetermined key operation.
A 10 G-bytes user area is secured on the data base server 52 on
the basis of a contract with the operator. The sent still or motion
image file is received in the user area. After all the image files
has been transferred from the memory card 34, the CPU 32 erases
all the accumulated image files from the memory card 34. This restores
the vacant capacity inside the memory card 34.
Incidentally, in the case that the vacant capacity of the user
area is decreased, the operator can purchase an additional user
area (30 M bytes) by performing predetermined key operation. Accordingly,
after the initial 10 G-bytes user area becomes full, the image files
may be stored to an additional area.
On the other hand, when it is desired to download a particular
image file (still or motion image file) stored in the data base
server 52 to the digital camera, the operator may operate a file
download key 48. Thereupon, the communication circuit 36 makes dialing
to the provider 50 and gets an access to the server 52. After establishing
a connection to the server 52, if the operator designates a desired
date, an image file created on that designated date is detected
on the server 52 side. Thus, downloaded is the compressed thumbnail
image data included in the detected image file. The downloaded compressed
thumbnail image data is stored to the compressed thumbnail image
storage area 24d through the memory control circuit 22.
Completing the download, the CPU 32 supplies a thumbnail image
decompressing command to the image compression/decompression circuit
30. The image compression/decompression circuit 30 reads out the
compressed thumbnail image data through the memory control circuit
22 and performs JPEG decompression on it. The decompressed thumbnail
image data is stored to the main-image storage area 24a through
the memory control circuit 22. That is, the main-image storage area
24a, when displaying an image on a LCD monitor 28, serves as a VRAM.
The decompressed thumbnail image data is stored not to the thumbnail
image area 24b but to the main-image storage area 24a. An NTSC encoder
26 reads the image data out of the main-image storage area 24a through
the memory control circuit 22 and converts the read-out image data
into an NTSC-formatted composite image signal. The converted composite
image signal is supplied to the incorporated LCD monitor 28. As
a result, a thumbnail image is displayed on the LCD monitor 28.
Incidentally, when compressed thumbnail image data is extracted
from a plurality of image files and downloaded, a plurality of screens
of thumbnail image data are stored in the main-image storage area
24a so that a plurality of thumbnail images area multi-displayed
on the LCD monitor 28.
In a state that thumbnail images are multi-displayed, when the
operator selects a desired thumbnail image by the ten key 44, selection
information is transmitted to the server 52. Thereupon, the server
52 specifies an image file corresponding to the sent selection information
and transmits the specified image file. The CPU 32 downloads the
image file transmitted from the server 52 through the communication
circuit 36 and records it onto the memory card 34. Also, the compressed
main-image data contained in the downloaded image file is stored
to the compressed main-image storage area 24c through the memory
control circuit 22, and a main-image decompressing command is sent
to the image compression/decompression circuit 30. The compressed
main-image data stored in the compressed main-image storage area
24c is decompressed by the image compression/decompression circuit
30. The decompressed main-image data is stored in the main-image
storage area 24a. Due to this the thumbnail image data stored in
the main-image storage area 24a is overwritten by the decompressed
main-image data. The NTSC encoder 26 performs encode processing
on the image data stored in the main-image storage area 24a similarly
to the above and supplies an encoded composite image signal to the
LCD monitor 28. As a result, the thumbnail images multi-displayed
are updated by a main image corresponding to a thumbnail image selected
by the operator.
Incidentally, when a motion image file is downloaded, a plurality
of frames of compressed main-image data area transferred from the
memory card 34 to the compressed main-image storage area 24c and
compressed main-image data of each frame is decompressed at an interval
of 1/15th of a second. As a result, a motion picture comprising
a plurality of frames of decompressed main images is displayed on
the monitor 28.
The CPU 32 concretely processes a flowchart shown in FIG. 2 to
FIG. 5 when it sends an image file to the server 52 or downloads
an image file from the server 52. Here, FIG. 2 shows a button-input
task and FIG. 3 an image-transmitting/receiving task. Also, FIG.
4 and FIG. 5 show respective subroutines of transmission and download
processes.
Referring first to FIG. 2, if an operator operates any of the release
button 40, the taking-mode select switch 42, the ten key 44, the
file-transmit key 46 and a file download key 48, the process restores
from a sleep state in step S1 to determine in step S3 whether any
button was operated or not. If an operated button herein is the
file-transmit key 46 or the file download key 48, the process proceeds
from the step S3 to step S5 to generate a transmission/reception
task startup signal. On the other hand, if the operated button is
the release button 40, the taking-mode select switch 42 or the ten
key 44, the process proceeds from the step S3 to S7 to perform another
process. After completing the process of the step S5 or step S7,
the CPU 32 returns to the step S1.
When a transmission/reception task startup signal is generated
in the step S5, the CPU 32 restores an image transmission/reception
task shown in FIG. 3 from a sleep state of step S21. Then, in step
S23 the picture-taking system is disabled and, in step S25, connection
is made to the provider 50. That is, the communication circuit 36
is controlled to make dialing to the provider 50 to establish connection
to the provider 50. After establishing a connection state, in step
S27 an URL of the server 52 is transmitted to the provider 50 thereby
making an access to the server 52.
When communication is made possible to and from the server, the
server 52 transmits a password screen of image data. In step S29,
this password screen of image data is downloaded from the server
52 and the downloaded image data is written to the main-image storage
area 24a of the SDRAM 24 through the memory control circuit 22.
This image data is read out by the NTSC encoder 26 through the memory
control circuit 22 and converted into a composite image signal.
As a result, a download screen shown in FIG. 11 is displayed on
the LCD monitor 28.
In step S31, it is determined whether the operator input a password
or not. If "YES", the input password is transmitted, in
step S31, to the server 52. The server 52, when the password is
correct, transmits a mode select screen of image data. In step S33,
the image data transmitted from the server 52 is downloaded and
processed similarly to the step S27. As a result, a mode select
screen shown in FIG. 12 is displayed on the LCD monitor 28.
Responsive to the mode select screen, when the operator selects
a transmission mode by the ten key 44, the CPU 32 in step S37 determines
"YES" and, in step S39, executes a transmission process.
On the other hand, when the user selects a download mode by the
ten key 44, the CPU 32 in step S41 determines "YES" and
executes a download process in step S43. When the process of the
step S39 or S43 is completed, then in step S45 the connection to
the provider 50 is cancelled and the process returns to the step
S21.
In step S39, the CPU 32 processes a subroutine shown in FIG. 4.
First, calculated in step S51 a total data amount of a transmission
image file (all the image files recorded in the memory card 34).
Next, in step S53 a request is made to the server 52 to transmit
vacant capacity information about the user area, and in step S55
vacant capacity information is downloaded from the server 52. In
step S57, comparison is made between a total data amount and a vacant
capacity. If the total data amount is greater than the vacant capacity,
in step S59 information of capacity insufficiency is sent to the
server 52. The server 52 transmits a purchase query screen of image
data in response to the capacity-insufficiency information. Consequently,
in step S61 the purchase query screen of image data is downloaded
to execute the same process as that of the step S27. As a result,
a purchase query screen shown in FIG. 13 is displayed on the LCD
monitor 28.
Responsive to the purchase query screen, if the operator select
"YES" by the ten key 44, the CPU 32 advances from step
S63 to step S67 to perform a process of purchasing an additional
area (30 M bytes). This provides an extension of 30 Mbytes to the
user area. After completing the purchase process, process returns
to the step S53. On the other hand, if the operator selects "NO"
by the ten key 44, the CPU 32 advances from the step S63 to step
S65 to display a storage-impossible screen as shown in FIG. 14 on
the LCD monitor 28. Thereafter, in step S73 the connection to the
server 52 is cancelled and then the process returns to the image
transmission/reception task shown in FIG. 3.
On the other hand, if it is determined in step S55 that the total
data amount is greater than the vacant capacity, the process advances
to step S69 to transmit all the image files recorded on the memory
card 34 to the server 52. Specifically, all the image files are
first stored to the compressed main-image storage area 24b and thereafter
transferred to the server 52 through the communication circuit 36.
After completing the transfer process, all the image files are deleted
from the memory card 34 in step S71. After deleting all the image
files, the process returns to the image transmission/reception task
shown in FIG. 3 through a disconnection process from the server
52 of step S73.
In the step S43 shown in FIG. 3, the CPU 32 executes a download
process shown in FIG. 5. At first, in step S81, a group select screen
shown in FIG. 15 is displayed on the LCD monitor 28 and then, in
step S83, a creation date of a desired image file is waited to input.
If the operator inputs a desired date by the ten key 44, date data
is transmitted in step S85 to the server 52. The server 52 extracts
an image file corresponding to the transmitted date data from the
user area and takes compressed thumbnail image data out of the extracted
image file. Then, the compressed thumbnail image data thus taken
out is transmitted.
In step S87, the compressed thumbnail image data transmitted from
the server 52 is downloaded to the compressed thumbnail image storage
area 24d of the SDRAM 24. The image compression/decompression circuit
30 is instructed to make a decompression process on the compressed
thumbnail image data. The compressed thumbnail image data is read
out through the memory control circuit 22 and decompressed by the
image compression/decompression circuit 30. The decompressed thumbnail
image data is stored to the main-image storage area 24a and thereafter
delivered to the NTSC encoder 26 through the memory control circuit
22. The NTSC encoder 26 converts the received thumbnail image data
into a composite image signal. As a result, a plurality of thumbnail
pictures are multi-displayed on the LCD monitor 28.
In step S89, it is determined whether a desired thumbnail image
has been selected by the ten key or not. If "YES", in
step S91 selection information is transmitted to the server 52.
The server 52 specifies a desired image file from the user area
based on the transmitted selection information, and transmits the
specified image file. In step S93, the image file transmitted from
the server 52 is downloaded and, in the following step S95, the
downloaded image file is recorded onto the memory card 34. In step
S97, the compressed main-image data contained in the downloaded
image file is reproduced.
Specifically, the compressed main-image data is stored to the compressed
main-image storage area 24c through the memory control circuit 22
and a main-image decompressing command is given to the image compression/decompression
circuit 30. The image compression/decompression circuit 30 reads
out the compressed main-image data stored in the compressed main-image
storage area 24c through the memory control circuit 22 and performs
JPEG decompression on the read-out compressed main-image data. The
decompressed main-image data is stored to the main-image storage
area 24a through the memory control circuit 22 and thereafter converted
into a composite image signal by the NTSC encoder 26. As a result,
a main picture same as the selected thumbnail image is displayed
on the entire screen of the LCD monitor 28. In the case that the
downloaded image file is a motion image file, a plurality of frames
of compressed main-image data are stored to the compressed main-image
storage area 24c and frames of compressed main-image data are sequentially
decompressed at an interval of 1/15th of a second. As a result,
a motion picture comprising a plurality of decompressed main images
is displayed on the monitor 28. After completing the process of
step S97, the process returns to the image transmission/reception
task shown in FIG. 3.
According to this embodiment, if a transmission mode is selected,
all the image files accumulated in the memory card 34 are saved
to the server 52 located at a remote site and the image files in
the memory card 34 are deleted. Accordingly, the operator is allowed
to continue to take pictures without paying attention to the vacant
capacity of the memory card 34. Also, where the vacant capacity
of the server 52 decreases lower than the size of the image file,
the user area can be extended by conducting a purchase procedure.
Thus, the operator can continue to take pictures without paying
attention to the user-area vacant capacity. Furthermore, because
the image files saved in the server 52 is to be downloaded by selecting
a download mode, it is possible to easily view a picture content
by the built-in LCD monitor 28.
A digital camera of another embodiment is similar to the FIG. 1
embodiment except in that the subroutines of FIG. 6 and FIG. 7 are
to be processed respectively in steps S39 and S43 of FIG. 3. Hence,
duplicated explanations will be omitted.
Referring first to FIG. 6, in steps S91 to S117, similar process
is made to that of the steps S51 to S67 of FIG. 4 and, in steps
S121, S123 and S127, similar process is made to that of the steps
S69 to S73 of FIG. 4. The difference from the process of FIG. 4
lies in that the processes of the steps S119 and S125 are added.
In step S119, compressed thumbnail image data is extracted from
each image file to be transmitted to the server 52. The extracted
compressed thumbnail image data is stored to the compressed thumbnail
image storage area 24d through the memory control circuit 22. In
step S125, the compressed thumbnail image data stored in the compressed
thumbnail image storage area 24d is read out through the memory
control circuit 22 and recorded to a predetermined area of the memory
card 34. That is, prior to transferring the image files accumulated
in the memory card 34 to the server 52, the compressed thumbnail
image data contained in the image files is read out and stored to
the SDRAM 24. The read-out compressed thumbnail image data is returned
to the memory card 34 after all the image files have been transferred.
Because the memory card 34 is nonvolatile, the compressed thumbnail
image data will not disappear even if the power is put off.
Referring subsequently to FIG. 7, in steps S133 to S141, a similar
process to that of the steps S89 to S97 of FIG. 5 is carried out.
The difference from the process of FIG. 5 lies in that the compressed
thumbnail image data stored in the memory card 34 in the step S131
is reproduced and multi-displayed on the LCD monitor 28. In this
embodiment, after the image files have been transferred to the server
52, the compressed thumbnail image data only is left in the memory
card 34. Consequently, the compressed thumbnail image data in the
memory card 34 is reproduced without downloading the compressed
thumbnail image data as is made in FIG. 5.
According to this embodiment, because of no necessity of downloading
the compressed thumbnail image data, it is possible to confirm simply
and swiftly as to what image file is being saved in the server 52.
A digital camera of still another embodiment is similar to the
above other embodiment except in that a subroutine of FIG. 1 and
FIG. 9 is to be processed in step S39 of FIG. 3. Hence, duplicated
explanations will be omitted as large as possible.
Referring to FIG. 8, the CPU 32 first, in step S151, reproduces
the compressed thumbnail image data contained in the image files
accumulated in the memory card 34 and multi-displays a plurality
of thumbnail pictures on the LCD monitor 28. Subsequently, it is
determined in step S153 whether the file-transmit key 46 was pressed
or not. It is determined in step S155 whether or not any of the
thumbnail images was selected by the ten key 44. If a thumbnail
image is selected by the ten key 44, the process advances to step
S157 to store an image file corresponding to the selected thumbnail
image as a transmission image file to the compressed main-image
storage area 24c. On the other hand, if the file-transmit key 46
is pressed, the process proceeds to step S159 to determine whether
one or more transmission image files exist or not. If no transmission
image file exists, the process returns to the step S153. However,
if one or more transmission image files exist, the process of step
S161 and the subsequent are executed. Incidentally, in steps S161
to S177, a similar process to that of steps S101 to S117 of FIG.
6 is to be made, hence duplicated explanation being omitted.
If it is determined in step S167 that the total data amount is
equal to or smaller than the vacant capacity, the process proceeds
to step S179 to extract compressed thumbnail image data from the
transmitting image files stored in the compressed main-image storage
area 24c. The extracted compressed thumbnail image data is stored
in the compressed thumbnail image storage area 24d. After completing
the process of the step S179, in step S181 the to-be-transmitted
image file within the compressed main-image storage area 24c is
transmitted to the server 52 and, in step S183, the image files
already transmitted are deleted from the memory card 34. Thereafter,
in step S185, the compressed thumbnail image data stored in the
compressed thumbnail image storage area 24d is recorded to the predetermined
area of the memory card 34. After ending the process of the step
S185, in step S187 the connection is cancelled from the server 52,
and then the process returns to the image transmission/reception
task of FIG. 3.
According to this embodiment, only the image files selected by
the operator are sent to the server 52 and the compressed thumbnail
image data relating to the transmitted image files is left in the
memory card 34. Consequently, the operator is allowed to arbitrary
select an image file desired saved in the server 52. Furthermore,
the operator can easily, swiftly confirm from the on-hand compressed
thumbnail image data as to what image files are currently saved
in the server 52.
In a digital camera of yet another embodiment, a subroutine shown
in FIG. 10 is processed in the process of step S7 of FIG. 2. The
CPU 32 first, in step S181, reproduces the compressed thumbnail
image data contained in the image files stored in the memory card
34 and multi-displays a plurality of thumbnail images on the LCD
monitor 28. If the operator herein selects any thumbnail image by
the ten key 44, the CPU in step S183 determines "YES"
and, in step S185, displays on the LCD monitor 28 a print-job screen
shown in FIG. 16. In response, if the operator inputs a desired
number and size of prints, the CPU advances from step S187 to step
S189 to add print-job information comprising a number and size to
the image file corresponding to the selected thumbnail image. After
ending the process of step S189, the process returns to the button-input
task of FIG. 2.
This embodiment is effective for the case where the server 52 side
can afford to provide print service of image files. That is, if
desired print-job information is added before transmission to the
image file through the above process and then the image file is
transmitted to the server 52, it is possible to positively, swiftly
send a required size and number of sheets to the server 52.
Also, in any of the above embodiments, because the image files
are under management in the Internet server 52, a plurality of persons
if know a password can freely save or download an image file by
utilization of their digital cameras. That is, the image files in
the server 52 can be shared by a plurality of persons.
Incidentally, in the embodiments, although the communication circuit
incorporates therein the function of a portable communication terminal,
the communication interface only may be connected to the bus while
communication with the provider be made through a separately prepared
portable communication terminal. In this case, it can be considered
for a method to connect between the digital camera and the portable
communication terminal via a communication-cable wire or a near-distance
wireless scheme such as of the Bluetooth technology.
Furthermore, although the above embodiments erased the image files
immediately after transmission, the following countermeasure is
to be considered in order to prevent the image files from disappearing
due to transmission errors. Where the to-be-transmitted image file
is an extremely important file, after the image file has been stored
to the server the same image file is sent back from the server so
that it is collated with an already-transmitted image file in the
memory card. If their data contents agree, no communication error
occurred is to be assumed and hence the already-transmitted image
file is erased. If there is disagreement, the already-transmitted
image file is again transmitted to the server.
Also, although the above embodiments exemplified the memory card
as a recording medium on the camera side, the recording medium may
be of every medium, including built-in flash memories and removable
magneto-optical disks. Also, the image data in the image file may
be non-compressive. Furthermore, the motion-image compression method
may use, in place of the MOTIONJPEG, MPEG without problems. The
user area on the server side is not limited to 10G bytes but may
have higher capacity.
Furthermore, in the above embodiments, it is on the digital-camera
side that obtains user-area vacant capacity information and compares
a data amount of a to-be-transmitted image file with the vacant
capacity information. In the invention, however, a data amount of
a to-be-transmitted image file may be transmitted to and compared
on the database server side so that a comparison result can be received
from the database server to detect a relationship in magnitude between
the vacant capacity and the data amount.
Furthermore, in the above other and still other embodiments, compressed
thumbnail image data is taken out prior to transmission of an image
file and the image file is erased from the memory card after transmitting
the image file. The compressed thumbnail image data taken out of
the image file can be stored to the memory card. However, the storage
of the compressed thumbnail image data is not necessarily into the
memory card. That is, a non-removable flash memory may be provided
in the digital camera so that the compressed thumbnail image data
taken out of the image file can be stored in the flash memory.
Also, an Internet communication function can be provided to the
digital camera so that contraction can be made with a particular
server prepared with image files having various-site geographical
data. If accessing the server to input an address, it is possible
to download an image file of a site of interest to the camera and
display it on the LCD monitor. Even where outing without carrying
a map and missing a way, a destination can be easily find out by
accessing the map server.
Furthermore, where preparing communication-functioned digital cameras
and one camera is carried to the outside while the other placed
set in front of a safe in the home, dial-connection can be made
as required using the carried digital camera to the in-home digital
camera. The in-home digital camera is made take a still picture
by remote control so that a taken image file is gotten through the
server to confirm the image file with using the carried camera.
This makes it possible to monitor whether a suspicious person is
sneaking into the home or not.
Although the present invention has been described and illustrated
in detail, it is clearly understood that the same is by way of illustration
and example only and is not to be taken by way of limitation, the
spirit and scope of the present invention being limited only by
the terms of the appended claims.
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