JP2004173005A - Successive image compressor, successive image compressing method, program therefor, and information recording medium having the program recorded therein - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a successive image compressor which shortens a trial compression time and improves a processing speed in an image compressing device for simultaneously forming images corresponding to a plurality of frames in a screen and obtained by continually photographing a subject, and also to provide a successive image compressing method therefor, a program therefor, and an information recording medium having the program recorded therein. <P>SOLUTION: In a digital still camera 100 having a continuous shooting function of forming images corresponding to a plurality of time-successive frames in a screen corresponding to one frame, a system controller 101 selects at least one from the plurality of frames of images. A data compressor 1043 compresses only the selected frame and calculates its data amount. A system controller 101 decides a parameter upon compressing the entire screen on the basis of the calculated result and the parameter upon the compression. The data compressor 1043 compresses the entire screen using the decided parameter, whereby the data amount when the entire screen is compressed is controlled to be within a predetermined range. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an image compression method and an image compression apparatus for compressing still image data, and more particularly, to a continuous image compression apparatus for compressing a plurality of still image data, a continuous image compression method, a program of the continuous image compression method, and information recorded thereon. It relates to a recording medium.
[0002]
[Prior art]
By compressing image data, the number of images that can be stored on a recording medium can be increased, image data can be stored on a small-capacity recording medium, and the time required to transmit images can be shortened. 2. Description of the Related Art An image compression apparatus that compresses image data using a compression technique has become widespread. As an example of a conventional image compression device, there is an “image compression device” disclosed in Patent Document 1.
[0003]
2. Description of the Related Art A device that compresses data of an image captured using an image sensor such as a CCD and generates an image file, a so-called digital still camera (digital camera) is one of widely used image compression devices.
[0004]
In a digital still camera, it is necessary to control the data compression ratio so that the data amount per image is constant so that a predetermined number of images can be photographed and recorded. Therefore, a method of performing several trial compressions to make the data amount of each image constant and determining a compression parameter is used.
[0005]
Some digital still cameras have a “continuous shooting” function of generating an image file including a plurality of still image data by continuously shooting a subject. By displaying a series of still images generated by continuous shooting continuously or simultaneously, it is possible to represent the movement of the subject.
[0006]
Normally, in the case of continuous shooting of single shooting, a method of compressing and writing a file for each image or a method of temporarily storing all continuously shot images in a frame memory is applied.
In the former case, the processing time is long since the processing is performed for each image, and the interval between continuous shootings cannot be shortened unless hardware with high processing capability is used. In the latter case, the processing capacity is limited by the capacity of the frame memory for temporarily storing the image, and a large-capacity frame memory must be provided to shorten the continuous shooting interval. Would.
[0007]
As described above, conventional techniques for compressing a continuous image include a “digital still camera” disclosed in Patent Literature 2, an “image data compression processing method and device” disclosed in Patent Literature 3, and Patent Literature 4. There is an "image processing method" disclosed.
[0008]
[Patent Document 1]
JP 2002-262098 A
[Patent Document 2]
JP-A-8-125957
[Patent Document 3]
Japanese Patent Publication No. 7-052951
[Patent Document 4]
Japanese Patent No. 3223866
[0009]
[Problems to be solved by the invention]
In the invention described in Patent Literature 1, since it is necessary to store image words encoded in the past, a storage device for that purpose must be provided. Further, the image is divided into image words of a predetermined number of bits line by line, and the image word to be currently coded is compared with the image word processed in the past. This is to determine whether or not a similar image word has already been encoded, but not to determine the correlation between a plurality of temporally consecutive images.
[0010]
Patent Literature 2 proposes “a digital still camera that simultaneously forms a plurality of frames on one frame (exposure) during normal shooting and then compresses and records data after continuous shooting”. I have. The continuous shooting mode according to the present invention is effective in that it does not require a detailed portion of each image, and can be realized without using expensive hardware when shooting a changing situation of a rapidly changing subject. It is.
However, the present invention realizes high-speed image compression by reducing the amount of data when capturing an image, but does not increase the speed of image compression processing. In other words, the present invention reduces the amount of data to be compressed by thinning out image data before compressing the image in the continuous shooting mode. It has not been.
[0011]
The invention described in Patent Document 3 divides the screen into a plurality of blocks, selects a representative block for each block, compresses the selected block, estimates the data amount of the entire screen, and speeds up image compression. Has been realized.
However, in this method, when the data amount of the selected block is significantly different from that of the other blocks, the data amount when the entire screen is actually compressed is different from the estimation result. In other words, in this method, since the screen is divided into blocks and thinning-out compression is performed, the estimation result and the actual compression result are compared with each other when the data amount greatly changes only in a part which is not compressed as a result of the thinning-out. Is shifted.
[0012]
According to the invention described in Patent Document 4, when continuous data such as a moving image is compressed, the correlation between successive images is taken into consideration, and the current image is compressed based on a compression parameter obtained by compressing the preceding image. The parameters for compressing are determined. In other words, the present invention considers inter-image correlation between continuous images in order to compress a continuous image such as a moving image, and based on a compression parameter and a compressed data amount when the preceding image is compressed, This determines the parameters for compressing the image.
However, in this method, when the state of the subject is largely different between the preceding image and the current image, the data amount when the current image is compressed greatly differs from the target data amount. Therefore, this method is suitable for controlling the amount of data per unit time as in the case of a moving image, but is not suitable for controlling data on a single-sheet basis. In other words, this method is effective when controlling the data amount of a continuous image such as a moving image in units of a predetermined number, but is suitable for controlling the data amount of one image. is not.
[0013]
As described above, conventionally, it was not possible to estimate the compressed data amount of the entire image by selecting some frames of the continuous image in consideration of the correlation between the images before and after the continuous shooting. And the processing time becomes longer.
[0014]
SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and in an image compression apparatus that performs continuous shooting to simultaneously form an image for a plurality of frames on a screen and performs compression and recording, the trial compression time is reduced. It is an object of the present invention to provide a continuous image compression apparatus, a continuous image compression method, a program thereof, and an information recording medium on which the program is recorded, with an improved processing speed.
[0015]
[Means for Solving the Problems]
In order to achieve the above object, the present invention provides, as a first aspect, an image compression apparatus having a continuous shooting function for forming and recording temporally continuous images for a plurality of frames in a screen for one frame. Frame selecting means for selecting at least one frame from a plurality of images taken continuously, counting means for compressing only the frames selected by the frame selecting means and calculating the data amount, calculation results of the counting means and frames A continuous image compression apparatus, comprising: a compression parameter determination unit that determines a parameter for compressing the entire screen based on a parameter when a frame selected by the selection unit is compressed.
[0016]
In the first aspect of the present invention, it is preferable that the frame selecting means selects a frame corresponding to a predetermined time interval from a plurality of frames formed in the screen. Alternatively, it is preferable that the image processing apparatus further includes a correlation detection unit that detects a correlation between images of the frames formed in the screen, and the frame selection unit selects a frame based on a detection result of the correlation detection unit.
[0017]
According to a second aspect of the present invention, there is provided a continuous image compression method for forming a plurality of temporally continuous images on a single-frame screen and compressing the images. A frame selecting step of selecting at least one frame from a plurality of images, a counting step of compressing only the image of the frame selected in the frame selecting step, and calculating a data amount thereof; A compression parameter determining step of determining a parameter for compressing the entire screen based on a calculation result and a parameter when the selected frame is compressed. .
[0018]
In the second aspect of the present invention, in the frame selection step, it is preferable to select a frame corresponding to a predetermined time interval from a plurality of frames formed in the screen. Alternatively, before the frame selection step, the image processing apparatus further includes a correlation detection step of detecting the correlation between the images of the respective frames formed in the screen, and in the frame selection step, based on the detection result in the correlation detection step. It is preferable to select a frame.
[0019]
In order to achieve the above object, according to a third aspect of the present invention, a substantial computer causes a plurality of temporally continuous images to be formed in a single-frame screen, and the images are compressed. A program of a continuous image compression method for causing a substantial computer to compress only the image of the frame selected in the frame selection step of selecting at least one frame from the images for a plurality of frames and the frame selection step, A counting step for calculating the data amount and a compression parameter determining step for determining parameters for compressing the entire screen based on the calculation result in the counting step and the parameters when the selected frame is compressed are executed. It is another object of the present invention to provide a continuous image compression method program.
[0020]
In the third aspect of the present invention, in the frame selecting step, it is preferable that the substantial computer select a frame corresponding to a predetermined time interval from each frame formed in the screen. Alternatively, at a stage prior to the frame selection step, the substantial computer is caused to execute a correlation detection step of detecting the correlation of the image of each frame formed on the screen, and in the frame selection step, It is preferable to have a substantial computer select a frame on the basis of the detection result.
[0021]
According to a fourth aspect of the present invention, there is provided an information recording medium storing the continuous image compression program according to the third aspect of the present invention.
[0022]
BEST MODE FOR CARRYING OUT THE INVENTION
[First Embodiment]
First Embodiment A preferred embodiment of the present invention will be described.
FIG. 1 shows a configuration of a digital still camera according to the present embodiment. The digital still camera 100 includes a system control unit 101, a key operation unit 102, an input device 103, an image processing LSI 104, a frame memory 105, and a memory card 106.
[0023]
The system control unit 101 includes a microcomputer (microcomputer) including a CPU, a ROM, a RAM, and the like (not shown). The CPU uses a RAM as a work area according to a program stored in the ROM, and performs key operation. The input device 103, the image processing LSI 104, the frame memory 105, etc., according to an instruction from the unit 102 or an external operation instruction device such as a remote controller (not shown) or an operation control by communication from an external device such as a computer terminal. And all operations of the digital still camera 100 are controlled.
Specifically, the system control unit 101 controls the imaging operation of the input device 103, sets image processing parameters in the image processing LSI 104, performs memory control, display control, and the like.
[0024]
The key operation unit 102 is an interface for the user to perform an input operation on the digital still camera 100, and includes a release key for instructing photographing and buttons for instructing various other settings.
[0025]
The input device 103 includes a lens unit (not shown), a CCD, a timing SG (control signal generator) for driving the CCD, and an A / D converter for converting an electric signal (analog image data) output from the CCD into a digital signal. Have.
[0026]
The image processing LSI 104 includes a display control unit and a data decompression unit (not shown) in addition to the image processing unit 1041, the memory control unit 1042, and the data compression unit 1043.
The data compression unit 1043 compresses the image data written in the frame memory 105 by a predetermined compression method (for example, JPEG) at the time of shooting, and outputs the processing result to the memory card 106 via the frame memory 105.
[0027]
The frame memory 105 temporarily stores data subjected to predetermined image processing in the image processing LSI 104.
[0028]
The memory card 106 is a storage device for storing compressed image data. Writing and reading of data to and from the memory card 106 are controlled by the system control unit 101, and the system control unit 101 reads out the compressed data temporarily stored in the frame memory 105 and writes it to the memory card 106. Although the memory card 106 is shown in FIG. 1 as being built in the digital camera 100, the memory card 106 may be externally attached to the digital camera 100.
[0029]
FIG. 2 shows a flow of processing when compressing and storing continuously shot images.
At the time of continuous shooting, the image processing LSI 104 performs thinning or reduction processing on the image data generated by the input device 103, and writes the processed data to the frame memory 105 (step S101). The memory control unit 1041 sequentially and continuously writes the plurality of images to the frame memory 105 while shifting the write addresses, and continuously shoots images in one frame area during normal shooting as shown in FIG. An image is arranged (Step S102).
[0030]
When the system control unit 101 selects some frames from the images arranged in the area for one frame (step S103), the data compression unit 1043 performs trial compression on the selected frames (step S103). S104). The system control unit 101 determines a final compression parameter to be used when compressing the entire screen based on the result (step S105).
[0031]
When the final compression parameter is determined, the data compression unit 1043 compresses the entire screen using the final compression parameter determined by trial compression (Step S106), and writes the image to the frame memory 105 once. The system control unit 101 adds file header information and the like to the compressed image data written back to the frame memory 105 and saves the compressed image data in the memory card 106 (step S107).
[0032]
The procedure of trial compression will be described.
The system control unit 101 selects one or more frames from the frames arranged in one screen during continuous shooting, and instructs the image processing unit 104 on the memory location (address) of the selected frame image. . For example, the frames arranged in one screen are selected at regular intervals (every other, every second, etc.) in chronological order. When the address of the selected image is specified, the image processing LSI 104 compresses the image of each selected frame in the data compression unit 1043.
[0033]
The system control unit 101 acquires the amount of compressed data of the image of each frame and calculates the total value of the amount of data. The system control unit 101 determines a compression parameter used when compressing the entire screen based on the total amount of compressed data and the compression parameter used for compression. The data compression unit 1043 compresses the entire screen using the determined compression parameter.
[0034]
Since temporally continuous images have high correlation between the images, when compressed using the same compression parameter, the data amount of the compression result often does not significantly change. Therefore, the data amount when an image of a certain frame is compressed and the data amount when an image of another frame highly correlated with this frame is compressed with the same compression parameter have almost the same value. Therefore, by compressing a part of the plurality of frames by the data compression unit 1043, the system control unit 101 can estimate the data amount of the frames before and after the frame with high accuracy.
[0035]
In addition, since the data compression unit 1043 compresses the entire frame selected by the system control unit 101, even when the data amount is uneven in the screen such as block thinning, the data amount of the compressed image of the entire screen is highly accurate. Can be estimated.
[0036]
For example, in FIG. 3, nine frames of images are arranged in an area for one frame. However, the system control unit 101 controls the amount of compressed image data by displaying three frames surrounded by a bold frame. Is the selected frame.
[0037]
Since the image of the frame selected by the system control unit 101 is often highly correlated with the preceding and succeeding images, the system control unit 101 obtains the three selected frames by performing three times the result of trial compression. A final compression parameter for compressing the entire screen is determined from the data amount and the compression parameter used for the trial compression.
[0038]
In this case, the trial compression is performed once and the estimation is calculated from the result. However, the trial compression is performed until a value three times the trial compression result falls within the range of the target data amount when the entire image is compressed. It may be repeated.
[0039]
Also, here, a digital still camera has been described as an example, but the above-described method of controlling the amount of compressed data is also applicable when a computer terminal is used as an image compression device.
In this case, each frame (frame) may be extracted from an image recorded as a moving image by video or the like, and a plurality of frames may be recorded as one image. Since a continuous image such as a moving image has a high correlation between frames, several frames are extracted from a series of moving images, trial compression is performed, and the total data amount of the entire screen is estimated based on the result, and a compression parameter is set. By deciding, it is possible to execute compression with the control of the amount of compressed data at high speed.
[0040]
[Second embodiment]
A second embodiment in which the present invention is preferably implemented will be described. The configuration of the digital still camera according to the present embodiment is the same as that of the first embodiment. In the present embodiment, the system control unit 101 selects a frame to be subjected to trial compression according to a predetermined time interval.
[0041]
A procedure when the digital still camera 100 in this embodiment performs trial compression on image data will be described.
In the area for one frame on the lower side of FIG. 4, the time interval between frames is set shorter than in the area on the upper side.
[0042]
Here, the time interval between frames in the lower area is 1/2 (for example, the time interval between frames in the upper area is t, and in the lower area is t / 2) as compared with the upper area. Then, the time for two frames in the lower area corresponds to the time for one frame in the upper area. Therefore, the system control unit 101 selects different numbers of frames in the upper area and the lower area at the same time interval.
[0043]
The correlation between temporally consecutive images is likely to be higher as the time interval between the images is shorter. Therefore, when the time interval between frames is short, the estimated value of the data amount of the compressed image of the entire screen can be accurately obtained even if the number of selected frames is reduced.
[0044]
Therefore, in the case of the lower area where the time interval between frames is short, the system control unit 101 determines a smaller number of selected frames than the upper area. For example, when selecting a frame every 2t, five frames surrounded by a thick frame are determined as selected frames in the upper area, and three frames surrounded by a thick frame are determined in the lower area.
[0045]
The image for two frames in the lower area is an image captured within the time corresponding to the image of one frame in the upper area, and thus has a high correlation with the selected frame. Therefore, the system control unit 101 converts a frame other than the selected frame by using the compression result of one of the selected frames before and after the selected frame. In other words, the compressed image data of a frame other than the selected frame is regarded as the same as the compressed image data of any of the selected frames before and after that. As a result, the amount of data to be processed by the data compression unit 1043 at the time of trial compression is reduced, so that image compression can be speeded up.
[0046]
In the digital still camera 100, the image data capturing interval of the CCD included in the input device 103 can be set as the time interval between frames. Since the system controller 101 controls the capture interval of image data in the CCD, the system controller 101 can perform frame selection using a control signal of the capture interval.
[0047]
In a case where the same trial compression as described above is performed in a computer terminal or the like, if data relating to time is stored together with the base image, this can be used.
For example, when a part of data recorded in a moving image is arranged in time series to form a continuous frame image, frame selection can be performed using the frame rate of the moving image. In other words, when arranging the images cut out from the moving image one by one in time series, the system control unit 101 determines the time between frames based on the frame rate of the moving image and how many frames the image is cut out. The interval can be specified, and the selected frame can be determined.
When generating an index image by reducing a normal continuous shot image, the system control unit 101 can read out the image recording time held in the file header of each image and specify the time interval between frames.
[0048]
[Third embodiment]
A third preferred embodiment of the present invention will be described. FIG. 5 shows a configuration of the digital still camera according to the present embodiment. The digital still camera 100 is the same as the first embodiment, except that the image processing LSI 104 further includes an inter-frame correlation detection unit 1044.
[0049]
The inter-frame correlation detection unit 1044 detects a correlation between frames of a series of continuous images. As an example of a method of detecting the correlation between frames, the system control unit 101 reads out the image of each frame fetched into the frame memory 105 and compares the images on a pixel-by-pixel basis, so that a pixel having a change between frames can be obtained. Can be detected. As another example, the system control unit 101 can detect the correlation using motion detection realized by MPEG or the like.
[0050]
The stronger the correlation between frames, the smaller the variation in the amount of image data when compressing an image using the same compression parameters. Therefore, by selecting a frame based on the correlation between the images of each frame, the compressed data amount of the entire screen predicted using the compression parameters calculated based on the compression results of some frames and the actual An error with the total data amount when the entire screen is compressed can be reduced.
For example, when there are five frames having high correlation with the image of a certain frame (hereinafter, frame A), the data amount when these frames are compressed is the same as the data amount when frame A is compressed. Even if it is considered, little error occurs. As the number of frames with many highly correlated frames is selected, the number of frames that can be considered as having the same amount of compressed data as the selected frame increases, so the total data amount when the entire screen is compressed is reduced Can be accurately estimated. That is, the system control unit 101. Control of the amount of compressed image data can be performed quickly and accurately.
[0051]
By detecting the correlation of the image of each frame, the system control unit 101 can select the frame to be trial-compressed regardless of the time interval between the frames. For example, if there is no change in the screen, the system control unit 101 can select only one of the consecutive frames as a selected frame and compress the entire screen based on the result of trial compression in the selected frame. is there.
[0052]
When the system control unit 101 determines the selected frame based only on the time interval between frames as in the second embodiment, light such as strobe light enters only one frame in continuous frames. In such a case, an error may occur in the estimated value of the compressed data amount of the entire screen.
On the other hand, as in the present embodiment, if the inter-frame correlation detection unit 1044 detects the correlation between frames and the system control unit 101 determines the selected frame, the frame group having a high correlation can be selected. Can be selected from. Therefore, if the data compression unit 1043 compresses the entire screen based on the result of the trial compression in the selected frame, the accuracy of the estimated value of the data amount of the compressed image of the entire screen can be increased.
[0053]
In addition, by detecting the correlation between images between frames, when generating an index image by reducing a normal continuous shot image, when the shooting time of each image is not recorded in the file head, or when the shooting interval Is too short, and the time interval between frames cannot be specified only by the imaging time recorded in the file head of each image, the system control unit 101 can select the frame to be trial-compressed. Therefore, the system control unit 101 specifies the minimum necessary frame as the selected frame, so that the data amount to be trial-compressed by the data compression unit 1043 can be reduced. Therefore, the processing time required for trial compression by the data compression unit 1043 can be reduced, and the processing speed when compressing image data can be increased.
[0054]
The above embodiments are merely examples of preferred embodiments of the present invention, and the present invention is not limited to these embodiments.
For example, in each of the above embodiments, a digital still camera provided with an LSI dedicated to image processing (image processing LSI 104) has been described as an example. However, the same operation as described above can be performed by software control in a general computer terminal. it can. In other words, when a general-purpose computer terminal shown in FIG. 6 does not include an LSI dedicated to image processing, a CPU (not shown) provided in the system control unit transmits control software from a storage device (for example, HDD) to the control software. May be read to provide a functional unit equivalent to the image processing LSI 104 in each of the above embodiments. Further, the control software may be written in a DSP or a programmable ROM.
[0055]
In addition, the criterion for selecting a frame in each of the above embodiments is an example, and a frame may be selected based on another criterion.
As described above, the present invention can be variously modified.
[0056]
【The invention's effect】
As is clear from the above description, according to the present invention, in an image compression apparatus that performs continuous shooting and simultaneously forms an image of a plurality of frames in a screen, and performs compression and recording, the trial compression time is reduced, It is possible to provide a continuous image compression apparatus, a continuous image compression method, a program thereof, and an information recording medium on which the program is recorded, with an improved processing speed.
[Brief description of the drawings]
FIG. 1 is a diagram showing a configuration of a digital still camera according to a first embodiment in which the present invention is suitably implemented.
FIG. 2 is a flowchart showing a flow of processing when a continuously shot image is compressed and stored.
FIG. 3 is a diagram illustrating an example of selecting a frame to be used for trial compression from a plurality of frames of images written in an area for one frame of a frame memory.
FIG. 4 is a block diagram showing an image compression apparatus according to a second embodiment of the present invention, in which, even when frames are selected at predetermined time intervals, the number of frames selected according to the time interval between frames is reduced. It is a figure which shows a difference.
FIG. 5 is a diagram showing a configuration of a digital still camera according to a third embodiment in which the present invention is suitably implemented.
FIG. 6 is a diagram showing a state where the present invention is implemented using a computer terminal.
[Explanation of symbols]
100 Digital Still Camera
101 System control unit
102 Key operation unit
103 input device
104 Image Processing LSI
105 frame memory
106 memory card
1041 Memory control unit
1042 Image processing unit
1043 Data compression unit
1044 Inter-frame correlation detector

Claims (10)

A continuous image compression apparatus having a continuous photographing function of forming and recording a plurality of temporally continuous images in a single-frame screen,
Frame selection means for selecting at least one frame from a plurality of images taken continuously,
Counting means for compressing only the frames selected by the frame selecting means and calculating the data amount thereof;
A compression parameter determining unit for determining a parameter for compressing the entire screen based on a calculation result of the counting unit and a parameter for compressing a frame selected by the frame selecting unit. Compression device. 2. The continuous image compression apparatus according to claim 1, wherein said frame selecting means selects a frame corresponding to a predetermined time interval from a plurality of frames formed on the screen. Correlation detection means for detecting the correlation of the image of each frame formed in the screen, further comprising a frame selection means for selecting a frame based on the detection result of the correlation detection means. The continuous image compression apparatus according to claim 1. A continuous image compression method for forming a plurality of temporally continuous images in a single-frame screen and compressing the images,
A frame selecting step of selecting at least one frame from the images for the plurality of frames,
A counting step of compressing only the image of the frame selected in the frame selection step and calculating the data amount thereof;
A compression parameter determining step of determining a parameter for compressing the entire screen based on a calculation result in the counting step and a parameter for compressing the selected frame. . 5. The continuous image compression method according to claim 4, wherein in the frame selection step, a frame corresponding to a predetermined time interval is selected from a plurality of frames formed on the screen. Prior to the frame selection step, further comprising a correlation detection step of detecting the correlation of the image of each frame formed in the screen,
5. The continuous image compression method according to claim 4, wherein in the frame selecting step, a frame is selected based on a detection result in the correlation detecting step. A program of a continuous image compression method for causing a substantial computer to form a plurality of temporally continuous images in one frame of a screen and compressing the images,
To the substantial computer,
A frame selecting step of selecting at least one frame from the images for the plurality of frames,
A counting step of compressing only the image of the frame selected in the frame selection step and calculating the data amount thereof;
A compression parameter determining step of determining a parameter for compressing the entire screen based on a calculation result in the counting step and a parameter for compressing the selected frame. How to program. 8. The continuous image processing method according to claim 7, wherein, in the frame selecting step, the substantial computer selects a frame corresponding to a predetermined time interval from each frame formed in the screen. Program. At the previous stage of the frame selection step, the substantial computer is caused to execute a correlation detection step of detecting the correlation of the image of each frame formed in the screen,
8. The program according to claim 7, wherein in the frame selecting step, the substantial computer is caused to select a frame based on a detection result in the correlation detecting step. An information recording medium on which a program for the continuous image compression method according to claim 7 is recorded.

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