JP6431803B2 - Image recording apparatus, image reproducing apparatus, method thereof, and program thereof - Google Patents

Description

  The present invention relates to an image recording apparatus, an image reproducing apparatus, a method thereof, and a program thereof.

  When image data is compressed and recorded, there is one that records first encoded data that has been irreversibly compressed and difference data between original image data and restored image data that has been restored from the first encoded data. . During normal reproduction, only the first encoded data is restored, and when the original image data is necessary, the first encoded data and the difference data are restored (Patent Document 1). Also, compressed data obtained by compression-encoding the reduced image data obtained by thinning out a part of the pixels, and compressed image quality holding data obtained by compression-encoding information for restoring the portion to be thinned out, Some are recorded (Patent Document 2).

JP-A-77-146927 JP-A-8-265752

  In the device described in Patent Document 1, there is redundancy between image data and difference data obtained by performing orthogonal transform and quantizing, and the total data amount becomes larger than before dividing into two data. Also in the one described in Patent Document 2, since two types of compressed data to be recorded have redundancy, the amount of data to be recorded increases.

  An object of the present invention is to reduce the amount of data to be recorded.

  An image recording apparatus according to a first aspect of the present invention includes a first sampling means for sampling original image data at a first sampling interval to obtain first sampling data, and a first sampling means obtained by the first sampling means. First orthogonal transform means for dividing the sampling data into a plurality of blocks and performing orthogonal transform to obtain first frequency component data for each block, and dividing the original image data into a plurality of blocks and performing orthogonal transform for each block 2nd orthogonal transformation means for obtaining second frequency component data; first frequency component data obtained by the first orthogonal transformation means; and second frequency component data obtained by the second orthogonal transformation means. Difference data calculation means for calculating difference data for each block, difference data calculated by the difference data calculation means, and first orthogonal transformation Characterized in that a recording control means for recording a first frequency component data obtained by a step in the recording medium.

  The first invention also provides an image recording method. That is, in this method, the first sampling means obtains the first sampling data by sampling the original image data at the first sampling interval, and the first orthogonal transform means obtains the first sampling means. The first sampling data is divided into a plurality of blocks and orthogonally transformed to obtain first frequency component data for each block, the second orthogonal transformation means divides the original image data into a plurality of blocks, and The second frequency component data is obtained for each block by orthogonal transformation, and the difference data calculation means obtains the first frequency component data obtained by the first orthogonal transformation means and the second frequency transformation data obtained by the second orthogonal transformation means. Difference data with respect to the frequency component data of 2 is calculated for each block, and the recording control means calculates the difference between the difference data calculated by the difference data calculation means and the first A first frequency component data obtained by the conversion means is for recording on a recording medium.

  The first invention also provides a program for controlling the computer of the image recording apparatus. A recording medium storing such a program may also be provided.

  According to a second aspect of the present invention, there is provided an image reproducing apparatus comprising: reading means for reading differential data and first frequency component data recorded on a recording medium; and first frequency component data read by the reading means. A first reproduction means for reproducing one image, and a second frequency represented by the first frequency component data and the difference data read by the reading means after the reproduction of the first image by the first reproduction means. Second reproducing means for reproducing an image.

  The second invention also provides an image reproduction method. That is, in this method, the reading means reads the difference data and the first frequency component data recorded on the recording medium, and the first reproducing means uses the first frequency component data read by the reading means. The first image represented is reproduced, and the second reproduction means is represented by the first frequency component data and the difference data read by the reading means after the reproduction of the first image by the first reproduction means. The second image to be reproduced is reproduced.

  The second invention also provides a program for controlling the computer of the image reproducing apparatus. A recording medium storing such a program may be provided.

  According to a third aspect of the present invention, there is provided an image recording apparatus according to a first sampling means for sampling original image data at a first sampling interval to obtain first sampling data, and a first sampling means obtained by the first sampling means. First orthogonal transform means for dividing the sampling data into a plurality of blocks and performing orthogonal transform to obtain first frequency component data for each block, and dividing the original image data into a plurality of blocks and performing orthogonal transform for each block 2nd orthogonal transformation means for obtaining second frequency component data; first frequency component data obtained by the first orthogonal transformation means; and second frequency component data obtained by the second orthogonal transformation means. First difference data calculation means for calculating the first difference data for each block, and the amount of quantized input data and output quantized data Quantization means for performing quantization processing, inverse quantization means for performing inverse quantization processing for dequantizing the quantized data output from the quantization means and outputting inverse quantized data, and output from the inverse quantization means The second difference data calculating means for calculating the second difference data between the inversely quantized data and the data input to the quantizing means, and the first frequency component data obtained by the first orthogonal transform means as initial values Input to the quantization means as input data, perform quantization processing by the quantization means, inverse quantization processing by the inverse quantization means, and calculation of the second difference data by the second difference data calculation means, and second The second difference data calculated by the difference data calculation means is given as input data to the quantization means, and the quantization processing by the quantization means, the inverse quantization processing by the inverse quantization means, and the second difference data calculation are performed. The calculation of the second difference data by the means is repeated a predetermined number of times, the first difference data calculated by the first difference data calculation means, the quantized data output from the quantization means, and the first difference data by the control means. And recording control means for recording the last second difference data obtained by calculation after a certain number of times in the difference data calculation means of No. 2 on a recording medium.

  The third invention also provides an image recording method. That is, in this method, the first sampling means obtains the first sampling data by sampling the original image data at the first sampling interval, and the first orthogonal transform means obtains the first sampling means. The first sampling data is divided into a plurality of blocks and orthogonally transformed to obtain first frequency component data for each block, the second orthogonal transformation means divides the original image data into a plurality of blocks, and The second frequency component data is obtained for each block by orthogonal transformation, and the first difference data calculation means is obtained by the first frequency component data obtained by the first orthogonal transformation means and the second orthogonal transformation means. First difference data with the second frequency component data thus obtained is calculated for each block, and the quantization means quantizes the input data and outputs the quantized data. The quantization process is performed, and the inverse quantization unit performs the inverse quantization process of dequantizing the quantized data output from the quantization unit and outputs the dequantized data, and the second difference data calculating unit includes: The second difference data between the inversely quantized data output from the inverse quantization means and the data input to the quantization means is calculated, and the control means obtains the first frequency component obtained by the first orthogonal transform means. Data is input to the quantization means as initial input data, quantization processing by the quantization means, inverse quantization processing by the inverse quantization means, and calculation of the second difference data by the second difference data calculation means, and The second difference data calculated by the second difference data calculation means is given as input data to the quantization means, and the quantization process by the quantization means, the inverse quantization process by the inverse quantization means, and the second difference data are given. The calculation of the second difference data by the data calculation means is repeated a certain number of times, and the recording control means performs the first difference data calculated by the first difference data calculation means, the quantized data output from the quantization means, and The last second difference data obtained by the calculation after a certain number of times in the second difference data calculation means by the control means is recorded on the recording medium.

  The third invention also provides a program for controlling the computer of the image recording apparatus. A recording medium storing such a program may be provided.

  According to a fourth aspect of the present invention, there is provided an image reproducing apparatus comprising: reading means for reading first difference data, quantized data and last second difference data recorded on a recording medium; and quantized data read by the reading means. A first reproduction means for reproduction, and after reproduction of the first image by the first reproduction means, reproduces a second image represented by the first difference data and quantized data read by the reading means. Or a second reproduction means for reproducing a third image represented by the first difference data, the quantized data, and the second difference data read by the reading means. To do.

  The fourth invention also provides an image reproduction method. That is, in this method, the reading means reads the first difference data, the quantized data and the last second difference data recorded on the recording medium, and the first reproducing means is read by the reading means. The second reproduction unit reproduces the quantized data, and the second reproduction unit is represented by the first difference data and the quantized data read by the reading unit after the reproduction of the first image by the first reproduction unit. Or the third image represented by the first difference data, the quantized data, and the last second difference data read by the reading means.

  The fourth invention also provides a program for controlling the computer of the image reproducing apparatus. A recording medium storing such a program may also be provided.

  According to a fifth aspect of the present invention, there is provided an image recording apparatus comprising: first sampling means for sampling original image data at a first sampling interval to obtain first sampling data; and first sampling obtained by the first sampling means. . First orthogonal transform means for dividing data into a plurality of blocks and performing orthogonal transform to obtain first frequency component data for each block, and quantizing the first frequency component data obtained by the first orthogonal transform means , First quantizing means for outputting first quantizing data, first quantizing means for performing first quantizing processing, first quantizing data outputted from the first quantizing means being inputted, and first inverse quantum Obtained by first inverse quantization means for performing first inverse quantization processing for outputting quantized data, first inverse quantized data output from the first inverse quantization means, and first orthogonal transform means. First An initial difference data calculating means for calculating initial difference data representing a difference from frequency component data; a second orthogonal unit for dividing original image data into a plurality of blocks and performing orthogonal transformation to obtain second frequency component data for each block; First difference data representing a difference between the first frequency component data obtained by the transform means and the first orthogonal transform means and the second frequency component data obtained by the second orthogonal transform means is obtained for each block. The first difference data calculating means for calculating, the second quantizing means for performing the second quantization processing for quantizing the input data and outputting the second quantized data, and the second quantizing means are outputted. The second inverse quantization means for inputting the second quantized data and outputting the second inverse quantized data, the second inverse quantization means for performing the second inverse quantization process, and the second inverse quantizing means outputted from the second inverse quantization means. 2 dequantized data Second difference data calculating means for calculating second difference data representing a difference from data input to the second quantizing means; initial difference data is input as initial input data to the second quantizing means; A second quantization process by the second quantization means, a second inverse quantization process by the second inverse quantization means, a second difference data calculation by the second difference data calculation means, and a second The second difference data calculated by the difference data calculation means is given as input data to the second quantization means, and the second quantization process by the second quantization means and the second inverse quantization means by the second quantization means The first difference data output from the first control means and the first difference data calculation means that repeats the second dequantization process and the calculation of the second difference data by the second difference data calculation means a predetermined number of times. And second difference data calculation An adding means for adding the last second difference data output from the means and outputting the added data; a third quantizing process for quantizing the input data and outputting the third quantized data; 3rd quantization means, 3rd inverse quantum which performs the 3rd inverse quantization process which inputs the 3rd quantization data output from the 3rd quantization means, and outputs 3rd inverse quantization data Difference data for calculating third difference data representing a difference between the third inverse quantized data output from the quantization means and the third inverse quantization means and the data input to the third quantization means The addition data obtained by the calculating means and the adding means is input to the third quantizing means as initial input data, the third quantizing process by the third quantizing means, and the third quantizing means by the third dequantizing means. 3 by the inverse quantization process and the third difference data calculation means Minute data is calculated, and the third difference data calculated by the third difference data calculation means is given to the third quantization means as input data, and the third quantization means by the third quantization means Processing, second control means for repeating the third inverse quantization process by the third inverse quantization means, and calculation of the third difference data by the third difference data calculation means for a predetermined number of times, and the first quantization The first quantized data output from the means, the second quantized data output from the second quantizing means, and the third quantized data output from the third quantizing means are recorded on the recording medium. The recording control means is provided.

  The fifth invention also provides an image recording method. That is, in this method, the first sampling means obtains the first sampling data by sampling the original image data at the first sampling interval, and the first orthogonal transform means obtains the first sampling means. The obtained first sampling data is divided into a plurality of blocks and orthogonally transformed to obtain first frequency component data for each block, and the first quantizing means is obtained by the first orthogonal transforming means. 1st frequency component data is quantized, the 1st quantization process which outputs 1st quantization data is performed, and the 1st dequantization means outputs the 1st quantum output from the 1st quantization means The first inverse quantization process is performed to input the quantized data, output the first inverse quantized data, and the initial difference data calculation means outputs the first inverse quantization output from the first inverse quantization means Data and 1 straight Initial difference data representing a difference from the first frequency component data obtained by the transforming means is calculated, and the second orthogonal transforming means divides the original image data into a plurality of blocks and performs orthogonal transform for each block. The second frequency component data is obtained, and the first difference data calculation means obtains the first frequency component data obtained by the first orthogonal transformation means and the second frequency component obtained by the second orthogonal transformation means. First difference data representing a difference with the data is calculated for each block, and the second quantization means performs a second quantization process for quantizing the input data and outputting the second quantized data. , The second inverse quantization means inputs the second quantized data output from the second quantizing means, performs a second inverse quantization process for outputting the second inverse quantized data, The second difference data calculating means has a second difference Second difference data representing a difference between the second dequantized data output from the quantizing means and data input to the second quantizing means is calculated, and the first control means calculates the initial difference data. Input to the second quantization means as initial input data, the second quantization process by the second quantization means, the second inverse quantization process by the second inverse quantization means, and the second difference data calculation The second difference data is calculated by the means, and the second difference data calculated by the second difference data calculating means is given as input data to the second quantizing means, and the second quantizing means The second quantization process, the second inverse quantization process by the second inverse quantization means, and the calculation of the second difference data by the second difference data calculation means are repeated a predetermined number of times. Output from the difference data calculation means The first difference data and the last second difference data output from the second difference data calculation means are added to output addition data, and the third quantization means quantizes the input data, 3rd quantization processing which outputs 3 quantization data is performed, the 3rd inverse quantization means inputs the 3rd quantization data output from the 3rd quantization means, 3rd inverse A third inverse quantization process for outputting quantized data is performed, and the third difference data calculating means outputs the third inverse quantized data and the third quantizing means output from the third inverse quantizing means. 3rd difference data showing the difference with the data input to is calculated, the 2nd control means inputs the addition data obtained by the addition means to the 3rd quantization means as initial input data, 3rd The third quantization process by the quantization means, and the third quantization process by the third inverse quantization means The third difference data is calculated by the quantization process and the third difference data calculating means, and the third difference data calculated by the third difference data calculating means is input to the third quantizing means as input data. The third quantization processing by the third quantization means, the third inverse quantization processing by the third inverse quantization means, and the calculation of the third difference data by the third difference data calculation means, The recording control means repeats a fixed number of times, from the first quantized data output from the first quantizing means, the second quantized data output from the second quantizing means, and the third quantizing means. The output third quantized data is recorded on a recording medium.

  The fifth invention also provides a program for controlling the computer of the image recording apparatus. A recording medium storing such a program may also be provided.

  According to a sixth aspect of the present invention, there is provided reading means for reading the first quantized data, the second quantized data, and the third quantized data recorded on the recording medium, and a first quantized data represented by the first quantized data. First reproduction means for reproducing one image, first reproduction data read by the reading means after reproduction of the first image by the first reproduction means, second quantization data, and third quantum And a second reproduction means for reproducing the second image represented by the digitized data.

  The sixth invention also provides an image reproduction method. That is, in this method, the reading means reads the first quantized data, the second quantized data, and the third quantized data recorded on the recording medium, and the first reproducing means reads the first quantized data. The first image represented by the quantized data is reproduced, and the second reproduction means reproduces the first quantized data read by the reading means after the reproduction of the first image by the first reproduction means. The second image represented by the second quantized data and the third quantized data is reproduced.

  The sixth invention also provides a program for controlling the computer of the image reproducing apparatus. A recording medium storing such a program may also be provided.

  You may further provide the 2nd sampling means which samples original image data by a 2nd sampling interval, and obtains 2nd sampling data. In this case, the second orthogonal transform means, for example, divides the second sampling data obtained by the second sampling means into a plurality of blocks, and orthogonally transforms the second frequency component data for each block. You will get.

  According to the first invention, difference data between the first frequency component data obtained from the first sampling data and the second frequency component data obtained from the original image data is calculated. The calculated difference data and first frequency component data are recorded on a recording medium. The difference data and the first frequency component data recorded on the recording medium have no overlapping data, and redundancy is eliminated. The amount of data recorded on the recording medium can be reduced.

  According to the second invention, by reproducing the first frequency component data, the first image representing the outline of the image is quickly reproduced. By reproducing the first frequency component data and the difference data, a detailed second image is reproduced.

  Also in the third aspect, the first difference data, the quantized data, and the last second difference data recorded on the recording medium have no redundant data, and redundancy is eliminated. The amount of data recorded on the recording medium can be reduced.

  According to the fourth invention, by reproducing the quantized data, the first image representing the outline of the image is quickly reproduced. By reproducing the first difference data and the quantized data, a second image that is more detailed than the first image is reproduced, and the first difference data, the quantized data, and the second difference data are reproduced. As a result, a third image that is more detailed than the second image is reproduced.

  According to the fifth aspect, the first quantized data, the second quantized data, and the third quantized data are recorded on the recording medium. Since these first quantized data, second quantized data, and third quantized data do not overlap, redundancy is eliminated and the amount of data recorded on the recording medium is reduced.

  According to the sixth aspect, by reproducing the quantized data, the first image is quickly reproduced, and the first quantized data, the second quantized data, and the third quantized data are reproduced. As a result, a high-quality second image can be reproduced.

1 shows an overview of an image compression system. It is a block diagram which shows the electric constitution of a smart phone. It is a block diagram which shows the electric constitution of a server. It is a flowchart which shows the recording process procedure of an image. It shows how the original image data is compressed. It shows how the original image data is compressed. It is a flowchart which shows the reproduction | regeneration processing procedure. The reproduced image is shown. It is a flowchart which shows the recording process procedure of an image. It shows how the original image data is compressed. It shows how the original image data is compressed. It is a flowchart which shows the recording process procedure of an image. It is a flowchart which shows the recording process procedure of an image. It shows how the original image data is compressed. It shows how the original image data is compressed. It is a flowchart which shows the reproduction | regeneration processing procedure. It is a flowchart which shows the reproduction | regeneration processing procedure. It is a flowchart which shows the recording process procedure of an image. It is a flowchart which shows the recording process procedure of an image. It shows how the original image data is compressed. It shows how the original image data is compressed. It shows the recorded data and how it is played back. It is a flowchart which shows the reproduction | regeneration processing procedure.

  FIG. 1 shows an embodiment of the present invention and shows an outline of an image compression system.

  The image compression system includes a smartphone 1 (so-called multi-function mobile phone, image reproduction device) and a server 10 (image recording device) that can communicate with each other via the Internet. Other communication devices such as a feature phone, a client computer, and a PDA (Personal Digital Assistant) may be used as long as they can communicate with the server 10 via the Internet, instead of the smartphone 1.

  FIG. 2 is a block diagram showing an electrical configuration of the smartphone 1.

  The overall operation of the smartphone 1 is controlled by the control device 2.

  The smartphone 1 is provided with a display device 3 for displaying images, characters, and the like. On the display screen of the display device 3, a touch panel 4 for receiving a command from the user is formed. The smartphone 1 includes a memory 5 for storing data, a microphone 6 for voice input, a speaker 7 for voice output, a communication device 8 for connecting to the Internet, and the like. Further, the smartphone 1 includes a memory card interface 9A. When image data or the like is stored in the memory card 9B, the image data is read out and an image is displayed on the display screen of the display device 3. Can be displayed. Further, when a program for controlling the operation described later is stored in the memory card 9B (recording medium for storing the program), the program is read from the memory card 9B and installed in the smartphone 1. The Thereby, the smart phone 1 performs the operation | movement mentioned later. Of course, the program may be stored in a recording medium other than the memory card 9B, and the program may be installed in the memory card 9B. Alternatively, the program may be received via the Internet and installed on the smartphone 1.

  FIG. 3 is a block diagram showing an electrical configuration of the server 10.

  The overall operation of the server 10 is controlled by a CPU (Central Processing Unit) 11.

  The server 10 includes a ROM (Read Only Memory) 12 that stores programs, a RAM (Random Access Memory) 13 that temporarily stores data, a CD-ROM (Compact Disc Read Only Memory) drive 14A, and a display device 15. Etc. are included. A keyboard 16 for giving commands to the server 10, a communication device 17 for connecting to the Internet, and an external storage device 18 are also connected to the server 10. Further, the server 10 includes an interface 20 to which a scanner 19A and a digital camera 19B can be connected.

  A CD-ROM (Compact Disc Read Only Memory) 14B (recording medium storing a computer-readable program) stores a program for controlling operations described later. When the program is read from the CD-ROM 14B and installed in the server 10, the server 10 performs an operation described later. Of course, the program may be stored in a recording medium other than the CD-ROM 14B, and the program may be installed in the server 10, or the program transmitted via the Internet is received, and the received program is the server. 10 may be installed.

  Image data is input to the server 10 via the Internet, a scanner 19A, a digital camera 19B, or the like. The input image data is compressed as described below and recorded in the external storage device 18.

  FIG. 4 is a flowchart showing a processing procedure for recording image data in the external storage device 18. 5 and 6 show how the original image data 31 is compressed.

  The original image data 31 input to the server 10 is given to the RAM 13 and temporarily stored. The original image data 31 is read from the RAM 13 and sampled at a first sampling interval by the CPU 11 (first sampling means) (step 21). By this sampling, first sampling data 32 is obtained. The first sampling data 32 is divided into a plurality of blocks Br (for example, composed of 8 pixels × 8 pixels) by the CPU 11 (step 22), and the first sampling data 33 divided into the plurality of blocks Br. Is obtained. The divided first sampling data 33 is subjected to orthogonal transformation by the CPU 11 (first orthogonal transformation means) (step 23). By performing orthogonal transform on the first sampling data 33, first frequency component data 34 is obtained for each block Br.

  The original image data 31 is also divided by the CPU 11 into a plurality of blocks Br (for example, 8 pixels × 8 pixels) (step 24), and divided original image data 43 is obtained. The divided original image data 43 is subjected to orthogonal transformation by the CPU 11 (second orthogonal transformation means) (step 25). By performing orthogonal transform on the divided original image data 43, second frequency component data 44 is obtained for each block Br.

  Referring to FIG. 6, the first frequency component data 34 is obtained by sampling the original image data 31 at the first sampling interval, while the second frequency component data 44 is sampled. Therefore, there is a portion where the second frequency component data 44 exists but the first frequency component data 34 does not exist (hatching in FIG. 6 indicates that data exists. Data indicated by a broken line) Indicates that it does not exist.)

  Difference data 35 between the first frequency component data 34 and the second frequency component data 44 obtained in this way is calculated by the CPU 11 (difference data calculation means) (step 26). The difference data 35 represents data that does not exist in the first frequency component data 34.

  The first frequency component data 34 and the difference data 35 are encoded by the CPU 11 (encoding means) (step 27). The encoded first frequency component data 34 and the encoded difference data 35 are recorded in the external storage device 18 (recording medium) by the CPU 11 (recording control means) (step 28).

  Since the image portion represented by the first frequency component data 34 recorded in the external storage device 18 and the image portion represented by the difference data 35 do not overlap, redundancy is eliminated. The amount of data recorded in the external storage device 18 can be reduced.

  FIG. 7 is a flowchart showing a reproduction processing procedure of the first frequency component data 34 and the difference data 35 recorded as described above. FIG. 8 is an example of a displayed image.

  The CPU 11 reads the encoded first frequency component data 34 recorded in the external storage device 18 (step 61). The encoded first frequency component data 34 is transmitted from the server 10 to the smartphone 1 by the communication device 17 (step 62).

  The first frequency component data 34 transmitted from the server 10 is received by the communication device 8 (reading means) of the smartphone 1 (reading of the first frequency component data 34 recorded on the recording medium) (step). 51). The received first frequency component data 34 is given to the memory 5 and temporarily stored. The first frequency component data 34 is read from the memory 5 and decoded by the control device 2 (step 52). The decoded first frequency component data 34 is reproduced in the control device 2 (first reproduction means) including conversion from frequency components to data representing pixels (step 53). Since the first frequency component data 34 is sampled as described above, the low frequency represented by the first frequency component data 34 is displayed on the display screen of the display device 3 as shown in FIG. An image quality image (first image) 71 is displayed (step 54).

  Subsequently, the differential data 35 encoded by the CPU 11 is read from the external storage device 18 of the server 10 (step 63). The encoded difference data 35 is transmitted to the smartphone 1 by the communication device 17 of the server 10 (step 64).

  The encoded difference data 35 from the server 10 is received by the communication device 8 (reading means) of the smartphone 1 (reading the difference data recorded on the recording medium) (step 55). The encoded difference data 35 is decoded by the control device 2 (step 56). After reproduction of the low-quality image (first image) 71, the decoded difference data 35 and the decoded first frequency component data 34 represent pixels from the frequency components in the control device 2 (second reproduction means). Playback including conversion into data is performed (step 57). By using both the first frequency component data 34 and the difference data 35, a high-quality image (second image) 72 is displayed on the display screen of the display device 3 as shown in FIG. (Step 58).

  The low-quality image 71 can be displayed in a relatively short time, and then the high-quality image 72 can be displayed.

  9 to 11 show modifications.

  In the above-described embodiment, the second frequency component data 44 is not sampled like the first frequency component data 34. However, in this modification, the second frequency component data 44 is also the original image data 31. Is obtained by sampling.

  FIG. 9 is a flowchart showing a processing procedure for recording image data in the external storage device 18, and corresponds to FIG. 10 and 11 show how the original image data 31 is compressed, and corresponds to FIGS. 5 and 6. FIG.

  In the same manner as described above, the data is read from the external storage device 18 of the server 10 and sampled by the CPU 11 at the first sampling interval (step 81), and the first sampling data 32 is obtained. The CPU 11 divides the first sampling data 32 into a plurality of blocks Br (step 82), and the divided first sampling data 33 is obtained. The first sampling data 33 divided into a plurality of blocks Br is orthogonally transformed by the CPU 11 (first orthogonal transformation means) (step 83), and the first frequency component data 34 is obtained.

  Unlike the embodiment described above, the original image data 31 is sampled by the CPU 11 (second sampling means) at the second sampling interval to obtain the second sampling data 42 (step 84). The second sampling interval is shorter than the first sampling interval. The data amount of the second sampling data 42 is larger than the data amount of the first sampling data 32. The second sampling data 42 is also divided into a plurality of blocks Br by the CPU 11 (step 85). The divided second sampling data 42 is orthogonally transformed by the CPU 11 (second orthogonal transformation means), and second frequency component data 44 is obtained for each block Br (step 86). Since the second sampling interval is shorter than the first sampling interval, the data amount of the second frequency component data 44 is larger than the data amount of the first frequency component data 34 as shown in FIG. Many (shows data with hatching).

  Difference data 35 between the first frequency component data 34 and the second frequency component data 44 is calculated by the CPU 11 (difference data calculation means) (step 88). As described above, each of the calculated difference data 35 and first frequency component data 34 is encoded by the CPU 11 (encoding means) (step 88), and the encoded difference data 35 and the encoded first difference data 35 are encoded. One frequency component data 34 is recorded in the external storage device 18 (recording medium) by the CPU 11 (recording control means) (step 89).

  As described above, even when the second frequency component data 44 is generated from the second sampling data 42 obtained by sampling the original image data 31, the first frequency component data 34 recorded in the external storage device 18 Since there is no data indicating the same image portion as the difference data 35, redundancy is eliminated.

  At the time of reproduction, as described with reference to FIG. 7, the encoded first frequency component data 34 is decoded and reproduced, so that a low-quality image (first image) 71 is first obtained. It is quickly displayed on the display screen of the display device 3 of the smartphone 1. Subsequently, the encoded difference data 35 is decoded, and the decoded first frequency component data 34 and the decoded difference data 35 are reproduced, whereby a high-quality image (second image) 72 is obtained. It is displayed on the display screen of the display device 3 of the smartphone 1.

  12 to 17 show another embodiment. This embodiment uses quantization.

  FIGS. 12 and 13 are flowcharts showing the recording processing procedure of the image data, and correspond to FIG. FIG. 14 shows a part of the compression processing and corresponds to FIG. FIG. 15 shows the state of quantization, inverse quantization, subtraction processing, and the like.

  It is assumed that original image data 31 is recorded in the external storage device 18. Original image data 31 is read from the external storage device 18 by the CPU 11. The read original image data is sampled by the CPU 11 (first sampling means) at the first sampling interval, and the first sampling data 32 is obtained (step 91). The first sampling data 32 is divided into a plurality of blocks Br by the CPU 11, and the divided first sampling data 33 is obtained. The divided first sampling data 33 is subjected to orthogonal transformation by the CPU 11 (first orthogonal transformation means), and the first frequency component data 34 is obtained for each block Br (step 92).

  Also, as described above, the original image data 31 is divided into a plurality of blocks Br by the CPU 11 (second orthogonal transformation means) and orthogonally transformed to obtain the second frequency component data 44 (step). 93).

  When the first frequency component data 34 and the second frequency component data 44 are obtained in this way, the first frequency component data 34 and the second frequency component data are obtained by the CPU 11 (first difference data calculation means). First difference data 35 representing a difference from the component data 44 is calculated (step 94).

  Referring mainly to FIGS. 14 and 15, first frequency component data 34 is used as initial input data, and CPU 11 (quantization means for quantizing input data and outputting quantized data) uses quantization coefficient k1. Quantization is performed to obtain first quantized data 34a (step 95). Quantization is to reduce the accuracy of data to obtain coarser data accuracy, and inverse quantization is to return the accuracy of coarse data to the original data accuracy. For example, if the quantization coefficient is k1 and floor (x) is an integer part of x, in quantization, the data after quantization = floor (data before quantization ÷ k1). In inverse quantization, data before quantization = data after quantization × k1. For this reason, even if inverse quantization is performed, the data before quantization may not be completely restored.

  The first quantized data 34a is inversely quantized by the CPU 11 (inverse quantizing means for inversely quantizing the quantized data output from the quantizing means and outputting inverse quantized data). Data 34b is obtained (step 96).

  Subsequently, the second difference data 34c representing the difference between the pre-quantization data (in this case, the first frequency component data 34) and the inverse quantization data (in this case, the first inverse quantization data 34b) is obtained. It is calculated by the CPU 11 (second difference data calculating means) (step 97) (second difference data between the inversely quantized data output from the quantizing means and the data input to the quantizing means is calculated).

  In this way, the first frequency component data 34 is input as initial input data to the CPU 11 (quantization means), the quantization process, the inverse quantization process by the CPU 11 (inverse quantization means), and the CPU 11 (second difference data). When the second difference data calculation by the calculation means) is performed, the calculated second difference data is given as input data to the CPU 11 (quantization means), the quantization process by the CPU 11 (quantization means), and the CPU 11 (reverse) The inverse quantization process by the quantization means) and the calculation of the second difference data by the CPU 11 (second difference data calculation means) are repeated a predetermined number of times by the CPU 11 (control means) (step 98).

  By performing these processes, as shown in FIG. 15, when the second difference data 34c is obtained, the second difference data 34c is quantized by the CPU 11 (quantization means), and the second quantum data 34c is quantized. Data 34d is obtained. The second quantized data 34d is dequantized by the CPU 11 (inverse quantizing means) to obtain second dequantized data 34e. The second difference data 34f between the second dequantized data 34e and the second difference data 34c before the quantization from which the second quantized data 34d is obtained is obtained.

  When the above process is repeated a certain number of times (YES in step 98), the first difference data 35, the first quantized data (including the quantization coefficient) 34a, the second quantized data 34d, and the above process The second difference data 34f at the end of the repetition is encoded by the CPU 11 (encoding means), respectively (step 99). The encoded first difference data 35, first quantized data (including quantized coefficients) 34a, second quantized data 34d, and the second difference data 34f at the end of the repetition of the above-described processing are stored in the CPU 11. The data is recorded in the external storage device 18 (recording medium) by (recording control means) (step 100).

  The first quantized data 34 a and the second quantized data 34 d constitute a part of the first frequency component data 34 that is missing in the first difference data 35. The second quantized data 34d is second difference data 34c between the first dequantized data 34b obtained by dequantizing the first quantized data 34a and the first frequency component data 34. Is quantized. Since the second difference data 34c is not included in the first quantized data 34a, the second quantized data 34d obtained by quantizing the second difference data 34c is also the first quantized data. The data is not included in 34a. The last second difference data 34f is also data that is not included in either the first quantized data 34a or the second quantized data 34d. For this purpose, the first frequency component data 34, the first quantized data 34a, the second quantized data 34d and the last second differential data 34f encoded and recorded in the external storage device 18 are: There is no data overlapping each other, and redundancy is eliminated.

  In the above-described embodiment, the original image data 31 is orthogonally transformed. However, as described with reference to FIGS. 9 to 11, the original image data 31 is converted into the second sampling shorter than the first sampling interval. The second sampling data may be obtained by sampling using the CPU 11 (second sampling means) at intervals. In this case, the second frequency component data 44 is obtained by being divided into a plurality of blocks Br and by the CPU 11 (second orthogonal transform means) for each block Br.

  16 and 17 are flowcharts showing the playback processing procedure, and correspond to the processing procedure of FIG.

  The encoded first quantized data 34a and the second quantized data 34d recorded in the external storage device 18 of the server 10 are read by the CPU 11 (step 131). The read first quantized data 34a and second quantized data 34d are transmitted from the server 10 to the smartphone 1 by the communication device 17 of the server 10 (step 132).

  The first quantized data 34a and the second quantized data 34d transmitted from the server 10 are received by the communication device 8 (reading means for reading the quantized data) of the smartphone 1 (step 111). Since the first quantized data 34a and the second quantized data 34d are encoded, they are decoded by the control device 2 (step 112). The decoded first quantized data 34a and second quantized data 34d are reproduced by the control device 2 (first reproducing means) such as inverse quantization (step 113). By reproducing the first quantized data 34a and the second quantized data 34d, a low-quality image (first image) 71 is displayed on the display screen of the display device 3 (step 114). A part of the quantized data may be reproduced without reproducing the quantized data of both the first quantized data 34a and the second quantized data 34d.

  Subsequently, the last encoded second difference data 34f is read from the external storage device 18 by the CPU 11 (step 133). The last read second difference data 34f is transmitted from the server 10 to the smartphone 1 (step 134).

  The last second difference data 34f transmitted from the server 10 is received by the communication device 8 of the smartphone 1 (reading means for the last second difference data 34f) (step 115). The last second difference data 34f is decoded by the control device 2 (step 116), and reproduction such as position conversion for pixel display is performed from the frequency component (step 117). A medium quality image is displayed on the display screen of the display device 3 from the reproduced first quantized data 34a, second quantized data 34d, and last second differential data 34f (step 118).

  Further, in the server 10, the CPU 11 reads the first difference data 35 encoded from the external storage device 18 (step 135). The read first difference data 35 is transmitted from the server 10 to the smartphone 1 (step 136).

  The first difference data 35 transmitted from the server 10 is received by the communication device 8 of the smartphone 1 (step 119) (reading means for reading the first difference data recorded on the recording medium). The encoded first difference data 35 is decoded by the control device 2 (step 120), and the first difference data 35, the first quantized data 34a and the second quantized data 34d are frequency-converted by the control device 2. Reproduction such as conversion from the component to the pixel display position is performed (second reproduction means). After the low-quality image (first image) 71 is reproduced, the high-quality image (second image) 72 is reproduced, and the high-quality image (second image) 72 is displayed on the display screen of the display device 3. (Step 122).

  In the above-described embodiment, the first differential data 35, the first quantized data 34a, and the second quantum are reproduced by the control device 2 (second reproducing means) after reproducing the low-quality image (first image) 71. The digitized data 34d and the last second difference data 34f are reproduced (reproduction of the third image), and a higher quality image (third image) is displayed on the display screen of the display device 3. Good.

  18 to 22 show still another embodiment.

  FIG. 18 and FIG. 19 are flowcharts showing a part of the image data recording processing procedure, and show processing following the processing of step 96 in FIG. 20 and 21 show a state in which compression is performed. FIG. 22 shows data recorded in the external storage device 18 and how it is reproduced.

  As described with reference to FIG. 12, when the original image data 31 is recorded in the external storage device 18 of the server 10, the original image data 31 is read from the external storage device 18, and the CPU 11 (first The first sampling data 32 is obtained by sampling the original image data at the first sampling interval (step 91 in FIG. 12). The first sampling data 32 is divided into a plurality of blocks Br by the CPU 11 (first orthogonal transformation means) and orthogonally transformed, whereby the first frequency component data 34 is obtained for each block Br (step in FIG. 12). 92). Further, the CPU 11 (second orthogonal transformation means) divides the original image data 31 into a plurality of blocks Br and orthogonally transforms them to obtain second frequency component data 44 for each block Br (step 93 in FIG. 12). ). Further, first difference data 35 representing the difference between the first frequency component data 34 and the second frequency component data 44 is calculated for each block by the CPU 11 (first difference data calculation means) (step in FIG. 12). 94).

  Referring to FIG. 20, the CPU 11 (first quantizing means) performs the first quantization process on the first frequency component data 34 to obtain the first quantized data 34a (step 95 in FIG. 12). ). The first quantized data 34a is subjected to the first dequantization processing by the CPU 11 (first dequantization means), and the first dequantized data 34b is obtained (step 96 in FIG. 12). Initial difference data (second difference data) 34c representing the difference between the first dequantized data 34b and the first frequency component data 34 is obtained by the CPU 11 (initial difference data calculating means) (step 97 in FIG. 18). .

  Further, the initial difference data 34c is subjected to the second quantization process by the CPU 11 (second quantization means) to obtain the second quantized data 34d (step 140 in FIG. 18), and the second quantized data 34d is subjected to a second dequantization process by the CPU 11 (second dequantization means), and second dequantized data 34e is obtained (step 141 in FIG. 18).

  Thus, the initial difference data 34c is input as initial input data to the CPU 11 (second quantization means), and the second quantization processing by the CPU 11 (second quantization means), CPU 11 (second inverse quantum). Second dequantization processing by the conversion means) and calculation of the second difference data 34f by the CPU 11 (second difference data calculation means). The second difference data 34f calculated by the CPU 11 (second difference data calculating means) is given as input data to the CPU 11 (second quantizing means), and the second difference data 34f by the CPU 11 (second quantizing means) is supplied. CPU 11 (first dequantization means), second dequantization processing by CPU 11 (second dequantization means) and second difference data calculation by CPU 11 (second difference data calculation means) The control means) repeats a certain number of times (step 142 in FIG. 18). When it is repeated a certain number of times (YES in step 142 in FIG. 18), the last second difference data (for example, the second difference data 34f) and the first difference data 35 in the second subtraction process performed a certain number of times Are added by the CPU 11 (adding means) to obtain addition data 35a (step 143 in FIG. 18).

  When the addition data 35a is obtained in this way, referring to FIG. 21, the CPU 11 (third quantization means) performs a third quantization process using the addition data 35a as initial input data. By this third quantization process, among the added data 35a, the third quantized data 34g is obtained for the second quantized data 34d, and the third quantized data 35b is obtained for the first difference data 35. Is obtained (step 144 in FIG. 18). A third inverse quantization process is performed on each of the third quantized data 34g and 35b by the CPU 11 (third inverse quantization means), and the third inverse quantized data 34g The quantized data 34h is obtained, and the third dequantized data 35c is obtained from the third quantized data 35b (step 145 in FIG. 18).

  Further, the third dequantized data 34h and 35c are the data (first data) before the third quantization process is performed from the third dequantized data 34h and 35c by the CPU 11 (third difference data calculating means). The third difference data 34i and 35d representing the difference between the data (data input to the third quantization means) and the respective data are calculated (step 146 in FIG. 18). For the third dequantized data 34h, third difference data 34i between the third dequantized data 34h and the second dequantized data 34e constituting the added data 35a is calculated, and the third inverse quantized data 34h is calculated. For the quantized data 35c, third difference data 35d between the third dequantized data 35c and the first difference data 35 constituting the addition data 35a is calculated.

  When the third difference data 34i and 35d are obtained in this way, a third quantization process is performed on the third difference data 34i and 35d by the CPU 11 (third quantization means). Quantized data 35j and 35e are obtained. The obtained third quantized data 35j and 35e are subjected to the third dequantization processing by the CPU 11 (third dequantization means), respectively, and the third dequantized data 34k and 35f are obtained. . Such third quantum processing, third inverse quantization processing, and third subtraction processing are repeated a predetermined number of times by the CPU 11 (second control means) (step 147 in FIG. 19). That is, the addition data 35a obtained by the CPU 11 as the addition means is input as initial input data to the CPU 11 as the third quantization means, and the quantization processing by the CPU 11 as the third quantization means, the third inverse The inverse quantization process by the CPU 11 that is the quantization means and the third difference data 34i and 35d are calculated by the CPU 11 that is the third difference data calculation means, and are calculated by the CPU 11 that is the third quantization means. The third difference data 34i and 35d are given as input data to the CPU 11 which is the third quantization means, and the third quantization process and the third inverse quantization means by the CPU 11 which is the third quantization means. The CPU 11 (second control means) calculates the third dequantization process by the CPU 11 that is and the third difference data calculation by the CPU 11 that is the third difference data calculation means. And repeats a certain number of times.

  Referring to FIG. 20 to FIG. 22, the first quantized data 34a, the second quantized data 34d thus obtained, and the third quantized data obtained by the first third quantizing process are obtained. The quantized data 34g and 35b and the third quantized data 35j and 35e obtained by the second third quantization process are encoded by the CPU 11 (encoding means) (step 148 in FIG. 19). The encoded first quantized data 34a, second quantized data 34d, third quantized data 34g and 35b, and third quantized data 35j and 35e are externally transmitted by the CPU 11 (recording control means). It is recorded in the storage device 18 (recording medium) (step 149).

  Also in this case, the third quantized data 34g recorded in the external storage device 18 includes the first frequency component data 34 and the first inverse quantized data 34b (corresponding to the first quantized data 34a). Is obtained based on the second difference data 34c and does not overlap with the first quantized data 34a recorded in the external storage device 18. The third quantized data 35j recorded in the external storage device 18 includes the third inverse quantized data 34h (corresponding to the third quantized data 34g recorded in the external storage device 18) and the second. This data is obtained based on the third difference data 34i from the inversely quantized data 34e and does not overlap with the third quantized data 34g recorded in the external storage device 18. Similarly, the third quantized data 35e recorded in the external storage device 18 includes third dequantized data 35c (corresponding to the third quantized data 35b recorded in the external storage device 18) and the third quantized data 35e. This data is obtained based on the third difference data 35d with the first difference data 35 and does not overlap with the third quantized data 35b recorded in the external storage device 18. As described above, the redundancy of the data recorded in the external storage device 18 is eliminated.

  In the embodiment described above, the second frequency component data 44 is obtained by orthogonally transforming the original image data 31, but the CPU 11 (second sampling means) samples at the second sampling interval. To obtain the second sampling data 42 (see FIG. 10), and the CPU 11 (second orthogonal transformation means) divides the second sampling data into a plurality of blocks Br and performs orthogonal transformation to obtain the second frequency. The component data 44 may be obtained.

  FIG. 22 shows how the first quantized data 34a, second quantized data 34d, third quantized data 34g and 35b, and 35j and 35e recorded in the external storage device 18 are reproduced. . FIG. 23 is a flowchart showing the reproduction processing procedure.

  Of the data recorded in the external storage device 18, the encoded first quantized data 34a is read by the CPU 11 (reading means) (step 161). The encoded first quantized data 34a is transmitted from the server 10 to the smartphone 1 (step 162).

  The encoded first quantized data 34a is received by the communication device 8 (reading means) of the smartphone 1 (step 151) (the encoded first quantum data recorded in the external storage device 18). The data 34a is read by the communication device 8). The encoded first quantized data 34a is decoded by the control device 2 (step 152). The decoded first quantized data 34a is subjected to reproduction processing such as inverse quantization by the control device 2 (first reproduction means) using the quantization coefficient (for example, K) used for quantization. , A low-quality image (reproduction of the first image) 71 is obtained. The obtained first image is displayed on the display screen of the display device 3 of the smartphone 1 (step 154).

  The remaining encoded second quantized data 34d, third quantized data 34g and 35b, and 35j and 35e are read from the external storage device 18 by the CPU 11 (reading means) (step 163). The read second quantized data 34d, third quantized data 34g and 35b, and 35j and 35e are transmitted from the server 10 to the smartphone 1 (step 164).

  The remaining second quantized data 34d, third quantized data 34g and 35b and 35j and 35e transmitted from the server 10 are received by the communication device 8 (reading means) of the smartphone 1 (step 155). The remaining second quantized data 34d, third quantized data 34g and 35b, and 35j and 35e are decoded by the control device 2 (step 156). Reproduction including the remaining second quantized data 34d, third quantized data 34g and 35b, and 35j and 35e decoded using the quantization coefficient at the time of quantization is performed by the control device 2 (first 2 reproduction means) (step 157). For example, when the second quantized data 34d is quantized with the quantized coefficient L, the quantized coefficient L is inversely quantized, and the third quantized data 34g and 35b are quantized with the quantized coefficient M. Is quantized with the quantization coefficient M, and when the third quantized data 35j and 35e are quantized with the quantization coefficient N, the quantization coefficient N Is dequantized using. Since the image is reproduced using the first quantized data 34a, the second quantized data 34d, the third quantized data 34g and 35b, and 35j and 35e, the display screen of the display device 3 of the smartphone 1 , A high-quality image (second image) 72 is displayed (step 158). After the low-quality image (first image) 71 is reproduced, the high-quality image (second image) 72 is reproduced.

  In the embodiment described above, the second quantized data 34d, the third quantized data 34g and 35b, and all the third quantized data 35j and 35e are reproduced. Among the quantized data 34g and 35b and 35j and 35e, the high-quality image (first image) is reproduced after the reproduction of the low-quality image (first image) 71 using the arbitrary third quantized data and the first quantized data 34a. 2 image) 72 may be reproduced and displayed.

  In the above-described embodiment, it is implemented by software. However, a part of the above-described processing may be performed by using hardware.

1 Smartphone (image playback device)
2 Control device (first reproduction means, second reproduction means)
8 Communication device (reading means)
10 Server (image recording device)
11 CPU (first sampling means, first orthogonal transform means, second orthogonal transform means, difference data calculation means, recording control means, second sampling means, encoding means, first difference data calculation means, Quantization means, inverse quantization means, second difference data calculation means, control means, first quantization means, first inverse quantization means, second quantization means, second inverse quantization means, Addition means, third quantization means, third inverse quantization means, third difference data calculation means)

Claims (23)

First sampling means for sampling original image data at a first sampling interval to obtain first sampling data;
First orthogonal transformation means for dividing the first sampling data obtained by the first sampling means into a plurality of blocks and performing orthogonal transformation to obtain first frequency component data for each block;
Second orthogonal transform means for dividing the original image data into a plurality of blocks and performing orthogonal transform to obtain second frequency component data for each block;
Difference data calculation means for calculating, for each block, difference data between the first frequency component data obtained by the first orthogonal transform means and the second frequency component data obtained by the second orthogonal transform means; ,
Recording control means for recording the difference data calculated by the difference data calculating means and the first frequency component data obtained by the first orthogonal transform means on a recording medium;
An image recording apparatus comprising: Further comprising second sampling means for sampling the original image data at a second sampling interval shorter than the first sampling interval to obtain second sampling data;
The second orthogonal transform means is:
The second sampling data obtained by the second sampling means is divided into a plurality of blocks and orthogonally transformed to obtain second frequency component data for each block.
The image recording apparatus according to claim 1. Encoding means for encoding the difference data calculated by the difference data calculation means and the first frequency component data obtained by the first orthogonal transform means;
The recording control means is
Recording the data encoded by the encoding means on the recording medium;
The image recording apparatus according to claim 1. Reading means for reading the difference data and the first frequency component data recorded on the recording medium according to claim 1;
First reproducing means for reproducing a first image represented by the first frequency component data read by the reading means;
Second reproduction means for reproducing the second image represented by the first frequency component data and the difference data read by the reading means after the reproduction of the first image by the first reproduction means. When,
An image reproducing apparatus comprising: First sampling means for sampling original image data at a first sampling interval to obtain first sampling data;
First orthogonal transformation means for dividing the first sampling data obtained by the first sampling means into a plurality of blocks and performing orthogonal transformation to obtain first frequency component data for each block;
Second orthogonal transform means for dividing the original image data into a plurality of blocks and performing orthogonal transform to obtain second frequency component data for each block;
The first difference data for each block is calculated for each block of the first frequency component data obtained by the first orthogonal transform means and the second frequency component data obtained by the second orthogonal transform means. Differential data calculation means of
Quantization means for performing quantization processing for quantizing input data and outputting quantized data;
Inverse quantization means for performing inverse quantization processing for inversely quantizing the quantized data output from the quantization means and outputting inverse quantized data;
Second difference data calculating means for calculating second difference data between the inverse quantized data output from the inverse quantizing means and the data input to the quantizing means;
The first frequency component data obtained by the first orthogonal transform means is input to the quantization means as initial input data, and the quantization process by the quantization means, the inverse quantization process by the inverse quantization means, and The second difference data is calculated by the second difference data calculation means, and the second difference data calculated by the second difference data calculation means is given to the quantization means as input data, Control means for repeating the quantization process by the quantization means, the inverse quantization process by the inverse quantization means, and the calculation of the second difference data by the second difference data calculation means a predetermined number of times, and the first difference data First difference data calculated by the calculation means, quantized data output from the quantization means, and second difference data calculation by the control means Recording control means for recording the last second difference data obtained by calculation after a certain number of times in the output means on a recording medium;
An image recording apparatus comprising: Further comprising second sampling means for sampling the original image data at a second sampling interval shorter than the first sampling interval to obtain second sampling data;
The second orthogonal transform means is:
The second sampling data obtained by the second sampling means is divided into a plurality of blocks and orthogonally transformed to obtain second frequency component data for each block.
The image recording apparatus according to claim 5. Encoding means for encoding the first difference data, the quantized data, and the last second difference data;
The recording control means is
Recording the data encoded by the encoding means on the recording medium;
The image recording apparatus according to claim 5. Reading means for reading the first difference data, the quantized data and the last second difference data recorded on the recording medium according to claim 5;
First reproducing means for reproducing the quantized data read by the reading means;
After reproduction of the first image by the first reproduction means, the second image represented by the first difference data and the quantized data read by the reading means is reproduced, or the reading is performed. Second reproduction means for reproducing a third image represented by the first difference data read by the means, the quantized data, and the last second difference data;
An image reproducing apparatus comprising: First sampling means for sampling original image data at a first sampling interval to obtain first sampling data;
First orthogonal transforming means for dividing the first sampling data obtained by the first sampling means into a plurality of blocks and performing orthogonal transform to obtain first frequency component data for each block;
First quantization means for performing first quantization processing for quantizing first frequency component data obtained by the first orthogonal transform means and outputting first quantized data;
First dequantization means for performing first dequantization processing for inputting first quantized data output from the first quantizing means and outputting first dequantized data;
An initial difference for calculating initial difference data representing a difference between the first dequantized data output from the first dequantization means and the first frequency component data obtained by the first orthogonal transform means. Data calculation means,
Second orthogonal transform means for dividing the original image data into a plurality of blocks and performing orthogonal transform to obtain second frequency component data for each block;
First difference data representing the difference between the first frequency component data obtained by the first orthogonal transform means and the second frequency component data obtained by the second orthogonal transform means is calculated for each block. First difference data calculating means for
Second quantizing means for quantizing input data and performing second quantization processing for outputting second quantized data;
Second dequantization means for inputting second quantized data output from the second quantizing means and performing second dequantization processing for outputting second dequantized data;
Second difference data calculation for calculating second difference data representing a difference between the second dequantized data output from the second dequantizing means and the data input to the second quantizing means. means,
Initial difference data is input to the second quantization means as initial input data, and the second quantization process by the second quantization means and the second inverse quantization process by the second inverse quantization means The second difference data is calculated by the second difference data calculation means, and the second difference data calculated by the second difference data calculation means is input to the second quantization means as input data. The second quantization process by the second quantization means, the second inverse quantization process by the second inverse quantization means, and the second difference data calculation means by the second difference data calculation means First control means for repeating the calculation a predetermined number of times;
Adding means for adding the first difference data output from the first difference data calculating means and the last second difference data output from the second difference data calculating means to output addition data;
Third quantizing means for quantizing input data and performing third quantization processing for outputting third quantized data;
Third inverse quantization means for inputting third quantized data output from the third quantizing means and performing third inverse quantization processing for outputting third inverse quantized data;
Third difference data calculation for calculating third difference data representing a difference between the third dequantized data output from the third dequantization means and the data input to the third quantization means. means,
The addition data obtained by the addition means is input as initial input data to the third quantization means, and the third quantization process by the third quantization means, and the third quantization process by the third inverse quantization means. 3, the third difference data is calculated by the third difference data calculating means, and the third difference data calculated by the third difference data calculating means is used as the third difference data. Given as input data to the quantizing means, by the third quantizing process by the third quantizing means, the third dequantizing process by the third dequantizing means, and the third difference data calculating means Second control means for repeating the calculation of the third difference data a predetermined number of times, first quantized data output from the first quantizing means, and second output from the second quantizing means Quantized data And recording control means for recording the third quantized data output from the third quantizing means on a recording medium,
An image recording apparatus comprising: Further comprising second sampling means for sampling the original image data at a second sampling interval shorter than the first sampling interval to obtain second sampling data;
The second orthogonal transform means is:
The second sampling data obtained by the second sampling means is divided into a plurality of blocks and orthogonally transformed to obtain second frequency component data for each block.
The image recording apparatus according to claim 9. Reading means for reading the first quantized data and the third quantized data recorded on the recording medium according to claim 9;
First reproducing means for reproducing a first image represented by the first quantized data;
After reproduction of the first image by the first reproduction unit, the first quantization data read by the reading unit and the third quantization data represented by arbitrary quantization data among the third quantization data. A second reproducing means for reproducing the two images;
An image reproducing apparatus comprising: A first sampling means for sampling the original image data at a first sampling interval to obtain first sampling data;
The first orthogonal transform means divides the first sampling data obtained by the first sampling means into a plurality of blocks, and performs orthogonal transform to obtain first frequency component data for each block,
A second orthogonal transform unit divides the original image data into a plurality of blocks and performs orthogonal transform to obtain second frequency component data for each block;
The difference data calculation means calculates difference data between the first frequency component data obtained by the first orthogonal transformation means and the second frequency component data obtained by the second orthogonal transformation means for each block. And
Recording control means records the difference data calculated by the difference data calculation means and the first frequency component data obtained by the first orthogonal transform means on a recording medium;
Image recording method. A reading unit reads the difference data and the first frequency component data recorded on the recording medium according to claim 12,
First reproducing means reproduces the first image represented by the first frequency component data read by the reading means;
The second reproduction means displays a second image represented by the first frequency component data and the difference data read by the reading means after the reproduction of the first image by the first reproduction means. Reproduce,
Image playback method. A first sampling means for sampling the original image data at a first sampling interval to obtain first sampling data;
The first orthogonal transform means divides the first sampling data obtained by the first sampling means into a plurality of blocks, and performs orthogonal transform to obtain first frequency component data for each block,
A second orthogonal transform unit divides the original image data into a plurality of blocks and performs orthogonal transform to obtain second frequency component data for each block;
The first difference data calculation means is a first difference between the first frequency component data obtained by the first orthogonal transformation means and the second frequency component data obtained by the second orthogonal transformation means. Calculate data for each block,
The quantization means quantizes the input data and performs quantization processing to output the quantized data.
The inverse quantization means performs an inverse quantization process for inversely quantizing the quantized data output from the quantization means and outputting inverse quantized data,
A second difference data calculating unit calculates second difference data between the dequantized data output from the dequantizing unit and the data input to the quantizing unit;
The control means inputs the first frequency component data obtained by the first orthogonal transform means to the quantization means as initial input data, and performs a quantization process by the quantization means and an inverse by the inverse quantization means. The second difference data is calculated by the second difference data calculation unit by the quantization process and the second difference data calculation unit, and the second difference data calculated by the second difference data calculation unit is input to the quantization unit. The quantization processing by the quantization means, the inverse quantization processing by the inverse quantization means, and the calculation of the second difference data by the second difference data calculation means are repeated a certain number of times,
The recording control means performs the first difference data calculated by the first difference data calculation means, the quantized data output from the quantization means, and a predetermined number of times in the second difference data calculation means by the control means. Record the last second difference data obtained by later calculation on a recording medium,
Image recording method. Reading means reads the first difference data, the quantized data and the last second difference data recorded on the recording medium according to claim 14,
First reproducing means reproduces the quantized data read by the reading means;
The second reproducing means displays the second image represented by the first difference data and the quantized data read by the reading means after the reproduction of the first image by the first reproducing means. Replaying or replaying a third image represented by the first differential data, the quantized data and the second differential data read by the reading means;
Image playback method. A first sampling means for sampling the original image data at a first sampling interval to obtain first sampling data;
The first orthogonal transform means divides the first sampling data obtained by the first sampling means into a plurality of blocks, and performs orthogonal transform to obtain first frequency component data for each block,
A first quantizing unit that quantizes the first frequency component data obtained by the first orthogonal transform unit and performs a first quantizing process for outputting the first quantized data;
A first inverse quantizing unit that inputs the first quantized data output from the first quantizing unit and performs a first dequantizing process for outputting the first dequantized data;
An initial difference data calculation means is an initial value representing a difference between the first inverse quantized data output from the first inverse quantization means and the first frequency component data obtained by the first orthogonal transform means. Calculate the difference data,
A second orthogonal transform unit divides the original image data into a plurality of blocks and performs orthogonal transform to obtain second frequency component data for each block;
A first difference data calculating means for representing a difference between the first frequency component data obtained by the first orthogonal transform means and the second frequency component data obtained by the second orthogonal transform means; 1 difference data is calculated for each block,
A second quantization means for performing a second quantization process for quantizing the input data and outputting the second quantized data;
A second inverse quantization means that receives the second quantized data output from the second quantizing means and performs a second inverse quantization process for outputting the second inverse quantized data;
Second difference data representing a difference between the second dequantized data output from the second dequantizing means and the data input to the second quantizing means by the second differential data calculating means. To calculate
The first control means inputs initial difference data as initial input data to the second quantization means, the second quantization process by the second quantization means, and the second inverse quantization means. The second difference data is calculated by the second inverse quantization process and the second difference data calculating means, and the second difference data calculated by the second difference data calculating means is used as the second difference data. The second quantization processing by the second quantization means, the second inverse quantization processing by the second inverse quantization means, and the second difference data calculation means Repeat the calculation of the second difference data by a certain number of times,
The adding means adds the first difference data output from the first difference data calculating means and the last second difference data output from the second difference data calculating means, and outputs the added data. And
The third quantization means quantizes the input data and performs a third quantization process for outputting the third quantized data,
The third inverse quantization means performs the third inverse quantization process for inputting the third quantized data output from the third quantizing means and outputting the third inverse quantized data,
Third difference data representing a difference between the third dequantized data output from the third dequantizing means and the data input to the third quantizing means. To calculate
The second control means inputs the addition data obtained by the addition means to the third quantization means as initial input data, and performs a third quantization process by the third quantization means, And the third difference data calculated by the third difference data calculating means and the third difference data calculating means by calculating the third difference data by the third difference data calculating means. Data is given as input data to the third quantization means, and the third quantization process by the third quantization means, the third inverse quantization process by the third inverse quantization means, and the The calculation of the third difference data by the difference data calculation means of 3 is repeated a certain number of times,
The recording control means outputs first quantized data output from the first quantizing means, second quantized data output from the second quantizing means, and output from the third quantizing means. Recording the third quantized data on a recording medium,
Image recording method. A reading means reads the first quantized data, the second quantized data, and the third quantized data recorded on the recording medium according to claim 16,
First reproducing means reproduces the first image represented by the first quantized data;
The second reproducing means, after reproducing the first image by the first reproducing means, reads the first quantized data, the second quantized data, and the third quantized data read by the reading means. A second image represented by any quantized data of the quantized data is reproduced,
Image playback method. A computer-readable program for controlling the computer of the image recording apparatus,
Sampling the original image data at a first sampling interval to obtain first sampling data;
The obtained first sampling data is divided into a plurality of blocks and orthogonally transformed to obtain first frequency component data for each block,
The original image data is divided into a plurality of blocks and orthogonally transformed to obtain second frequency component data for each block,
The difference data between the obtained first frequency component data and the second frequency component data is calculated for each block,
A computer-readable program for controlling a computer of an image recording apparatus to record the calculated difference data and the obtained first frequency component data on a recording medium. A computer-readable program for controlling a computer of an image reproduction device,
19. Read the difference data and the first frequency component data recorded on the recording medium according to claim 18,
Reproducing the first image represented by the read first frequency component data;
A program readable by a computer that controls a computer of an image reproduction apparatus so as to reproduce a second image represented by the first frequency component data and the difference data after reproduction of the first image. A computer-readable program for controlling the computer of the image recording apparatus,
Sampling the original image data at a first sampling interval to obtain first sampling data;
The obtained first sampling data is divided into a plurality of blocks and orthogonally transformed to obtain first frequency component data for each block,
The original image data is divided into a plurality of blocks and orthogonally transformed to obtain second frequency component data for each block,
Calculating the first difference data between the obtained first frequency component data and second frequency component data for each block;
Quantize the given data, perform quantization processing to obtain quantized data,
Dequantize the quantized data that has been subjected to the above quantization process to obtain dequantized data,
Calculating second difference data between the dequantized data obtained by the dequantization process and the data given to the quantization process;
The obtained first frequency component data is used as initial input data, the quantization process is performed, the quantization process, the inverse quantization process, and the calculation of the second difference data are performed. Second difference data is given as data for performing the quantization process, and the quantization process, the inverse quantization process, and the calculation of the second difference data are repeated a certain number of times,
Recording the calculated first difference data, the quantized data obtained by the quantization process, and the last second difference data obtained by calculating the second difference data after a predetermined number of times are recorded on a recording medium. A computer-readable program for controlling the computer of the image recording apparatus to cause A computer-readable program for controlling a computer of an image reproduction device,
The first differential data, the quantized data, and the last second differential data recorded on the recording medium according to claim 20, are read.
Reproduce the read quantized data,
After reproduction of the first image, the second image represented by the read first difference data and the quantized data is reproduced, or the read first difference data and the quantized data A computer-readable program for controlling a computer of an image reproduction device to reproduce a third image represented by data and the second difference data. A computer-readable program for controlling the computer of the image recording apparatus,
Sampling the original image data at a first sampling interval to obtain first sampling data;
The obtained first sampling data is divided into a plurality of blocks and orthogonally transformed to obtain first frequency component data for each block,
Quantizing the obtained first frequency component data, and performing a first quantization process for outputting the first quantized data;
First output quantized data is input, and first dequantization processing is performed to output first dequantized data.
Calculating initial difference data representing a difference between the output first dequantized data and the obtained first frequency component data;
The original image data is divided into a plurality of blocks and orthogonally transformed to obtain second frequency component data for each block,
Calculating first difference data representing a difference between the obtained first frequency component data and the obtained second frequency component data for each block;
Quantize input data and perform second quantization processing to output second quantized data,
Inputting the second quantized data output in the second quantizing process, and performing the second dequantizing process for outputting the second dequantized data;
Calculating second difference data representing a difference between the second dequantized data output in the second dequantization process and the data input to the second quantization process;
The second quantization process is performed using initial difference data as initial input data, the second quantization process, the second inverse quantization process, and the calculation of the second difference data are performed. Second difference data is given as input data for the second quantization process, and the second quantization process, the second inverse quantization process, and the calculation of the second difference data are repeated a certain number of times. Let
Adding the first difference data and the second difference data at the end of the calculation of the second difference data to output addition data;
Quantize input data and perform third quantization processing to output third quantized data,
Inputting the third quantized data output in the third quantizing process, and performing the third dequantizing process for outputting the third dequantized data;
Calculating third difference data representing a difference between the third dequantized data output in the third dequantization process and the data input in the third quantization process;
Performing the third quantization process using the addition data as initial input data, performing the third quantization process, the third inverse quantization process, and calculating the third difference data; and Third difference data is given as input data in the third quantization process, and the third quantization process, the third inverse quantization process, and the calculation of the third difference data are repeated a predetermined number of times. Let
A computer-readable program for controlling a computer of an image recording apparatus so as to record the first quantized data, the second quantized data, and the third quantized data on a recording medium. A computer-readable program for controlling a computer of an image reproduction device,
23. Reading the first quantized data, the second quantized data, and the third quantized data recorded on the recording medium according to claim 22,
Playing back the first image represented by the first quantized data;
A computer of an image reproducing apparatus that reproduces the second image represented by the first quantized data, the second quantized data, and the third quantized data after reproducing the first image. A computer-readable program that controls the computer.

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