JP2007013706A - Image data generating apparatus, image data generating method, and image data generating program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an image data generating apparatus, an image data generating method, and an image data generating program capable of generating high quality image data whereby both an original image and a high quality image can be decoded. <P>SOLUTION: A high image quality/high resolution processing section 13 applies high quality processing to an original image PG obtained by decoding coded original image data DG by a decoder 12 to produce a target high quality image PQ, an attached data generating section 15 attaches trial attached data DA for generating the high quality image PQ to the original image data DG to generate integrated image data DU, the decoder 12 decodes the integrated image data DU to generate an integrated image PU for comparison with the high quality image PQ, the attached data generating section 15 updates the attached data DA to reduce the difference between the integrated image PU and the high quality image PQ so as to repeat the production of the integrated image data DU and the update of the attached data DA thereby bringing the integrated image data DU close to the high quality image PQ. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an image data generation device, an image data generation method, and an image data generation program, and is suitably applied to, for example, a high quality image data generation device that generates high quality image data.

  In recent years, with the spread of information processing apparatuses capable of handling images such as personal computers and digital still cameras, image data obtained by encoding analog images with a coding method such as JPEG (Joint Photographic Experts Group) has been widely used. Yes.

  For example, in the case of a digital still camera, the resolution (hereinafter referred to as the resolution of image data) in an image when image data is decoded is determined by the number of pixels (that is, resolution) in an image sensor such as a CCD (Charge Coupled Device). It will be fixed.

  By the way, when the resolution of the image data is relatively low, an image obtained by decoding the low-resolution image data (hereinafter referred to as original image data) (hereinafter referred to as the original image) as editing processing for the image data. The original image is subjected to pixel interpolation processing, edge enhancement processing, etc., to generate a high-quality image in which the original image has a higher image quality / higher resolution (hereinafter referred to as higher quality), and There is a demand for generating and storing high quality data obtained by encoding a high quality image.

  In response to such a request, for example, as shown in FIG. 4, a high-quality image PQ is generated by performing a quality improvement process on the original image PG obtained by decoding the low-resolution original image data DG, and this is encoded again. A high-quality image data generation device has been proposed that generates high-quality image data.

Further, JPEG2000 has been proposed as one of image data encoding methods. In JPEG2000, an original image is subjected to hierarchical coding based on wavelet transform, and an image with a plurality of types of resolutions is generated by extracting only the necessary layer portion from one generated image data. (See, for example, Patent Document 1).
JP 2003-152544 A (page 14, FIG. 7)

  By the way, when the hierarchical image data DC is generated from the high quality image PQ in such a high quality image data generation apparatus, it is conceivable to perform hierarchical encoding using the above-described JPEG2000.

  In this case, as shown in FIG. 4, the high-quality image data generation device converts the hierarchical image data DC into the low-frequency subband DSL representing the low-frequency component of the high-quality image PQ and the high-frequency component of the high-quality image PQ. Is generated by being divided into high-frequency subbands DCH.

  Here, when the low-frequency subband DCL is decoded from the hierarchical image data DC, a low-resolution image GL having the same resolution as the original image PG is generated. However, since the low-frequency subband DSL and the original image data DG are not the same, the low-resolution image GL is different from each other although it is somewhat similar to the original image PG.

  In hierarchical encoding, the low-resolution image GL slightly changes depending on the encoding method and parameter settings at the time of hierarchical encoding, but it is practically impossible to generate a desired low-resolution image. Conceivable.

  That is, since the high quality image data generation device cannot generate the original image PG from the hierarchical image data DC, the original image data DG is left so that the user can refer to the original image PG even after the generation of the hierarchical image data DC. If it is desired to store the data, both the hierarchical image data DC and the original image data DG need to be stored. As a result, the data size in a storage medium such as a hard disk drive increases, and the number of image data that can be stored is reduced. There was a problem of being reduced.

  The present invention has been made in consideration of the above points. An image data generation apparatus, an image data generation method, and an image data generation program capable of generating high-quality image data capable of decoding both an original image and a high-quality image are provided. It is what we are going to propose.

  In order to solve such a problem, in the present invention, a high-quality target image is generated by performing a predetermined high-quality process on the original image obtained by decoding the original image data encoded by the predetermined encoding method. , To generate the integrated image data by adding experimental additional data to the original image data to generate the target image, and to generate an integrated image for comparison with the target image by decoding the integrated image data; The additional data is updated to reduce the difference between the integrated image and the target image, and generation of the integrated image data and update of the additional data are repeated to bring the integrated image closer to the target image.

  As a result, the additional data is updated while bringing the integrated image close to the target image without changing the original image data itself, so that the original image can be generated and the integrated image data that can generate the integrated image close to the target image is generated. can do.

  According to the present invention, since the additional data is updated while comparing the integrated image and the target image without changing the original image data itself, an original image can be generated and an integrated image close to the target image can be generated. Integrated image data can be generated, and thus an image data generation apparatus, an image data generation method, and an image data generation program that can generate high-quality image data that can decode both an original image and a high-quality image can be realized.

  Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.

(1) Configuration of Image Data Generation Device As shown in FIG. 1, a high quality image data generation device 1 includes a storage unit 3 and a hard disk drive (HDD) 4 in a control unit 2 that controls the high quality image data generation device 1. As a whole, high-quality image data is generated based on the image data read from the hard disk drive 4 and written to the hard disk drive 4.

  The control unit 2 is configured around a CPU (Central Processing Unit) (not shown), and stores various programs such as a basic program read from a ROM (Read Only Memory) (not shown) and an image data generation program read from the hard disk drive 4. The high-quality image data generating apparatus 1 is operated by expanding and executing it in a work memory (not shown) of the storage unit 3.

  The storage unit 3 includes an image memory 21 that stores an image decoded from image data, and a data memory 22 that stores image data obtained by encoding the image.

  The hard disk drive 4 stores image data encoded by an encoding method such as JPEG (Joint Photographic Experts Group), and can store hierarchical image data encoded by a hierarchical encoding method such as JPEG2000. It has also been made.

  The data interface (I / F) 11 reads image data (hereinafter referred to as original image data DG) from the hard disk drive 4, supplies the data to the data memory 22 of the storage unit 3, and stores the original data. Image data DG is supplied to the decoder 12.

  The data interface 11 writes the image data to the hard disk drive 4 by sending the image data stored in the data memory 22 to the hard disk drive 4.

  As shown in FIG. 2, the decoder 12 generates an original image PG by decoding (decoding) the original image data DG, and supplies the original image PG to the image memory 21 for storage. The decoder 12 decodes the hierarchical image data hierarchically encoded by the JPEG2000 system in the same manner and stores it in the image memory 21.

  Incidentally, the high quality image data generation device 1 displays the image on the monitor device by sending an image such as the original image PG stored in the image memory 21 to a monitor device (not shown) based on a predetermined operation by the user. It is also possible to allow the user to appreciate it.

  The image quality enhancement / resolution enhancement processing unit 13 (FIG. 1) performs pixel interpolation processing, edge enhancement processing, and the like on the original image PG stored in the image memory 21, thereby obtaining the original image PG with high image quality. A high quality image PQ (FIG. 2) having a high resolution / high resolution (hereinafter referred to as high quality) is generated and supplied to the image memory 21 for storage.

  The image comparison unit 14 (FIG. 1) determines whether or not the difference between the two calculated based on a predetermined difference calculation process based on the two types of images stored in the image memory 21 is equal to or less than a predetermined threshold. By determining, the two types of images are compared to determine the similarity.

  The additional data generation unit 15 can generate the integrated image data DU (FIG. 2) representing the high-quality integrated image PU by adding the additional data DA to the original image data DG. This additional data DA is composed of high-frequency components and the like not included in the original image data DG for generating a high-resolution integrated image PU based on the low-resolution original image data DG (details will be described later). .

  Further, the additional data generation unit 15 has an encoder 15A that encodes an image by the JPEG2000 system, and applies a hierarchical encoding process to the high-quality image PQ stored in the image memory 21 by the encoder 15A. Accordingly, hierarchical image data DC (FIG. 4) that can generate (that is, hierarchical) images having a plurality of types of resolutions is generated and stored in the data memory 22.

  This hierarchical image data DC is composed of a low frequency subband DCL and a high frequency subband DCH. The low-frequency subband DCL corresponds to an image having the same quality as that of the original image PG, while the high-frequency subband DCH is the remaining portion of the hierarchical image data DC excluding the low-frequency subband DCL ( That is, it corresponds to a high frequency component).

  As described above, the high-quality image data generation device 1 generates a high-quality image PQ obtained by improving the quality of the original image PG, and generates hierarchical image data DC by hierarchically encoding the high-quality image PQ. The integrated image data DU is generated by adding the additional data DA to the image data DG.

(2) Generation of High Quality Image Data (2-1) Basic Principle As shown in FIG. 2, the high quality image data generation device 1 improves the quality of the original image PG obtained by decoding the original image data DG. Can generate a high-quality image PQ, but when the high-quality image PQ is hierarchically encoded by an encoding method such as JPEG2000, as shown in FIG. 4, the original image data DG is included in the hierarchical image data DC. It is not included.

  Therefore, the high-quality image data generation device 1 adds the high-frequency subband DCH (FIG. 2) of the hierarchical image data DC as additional data DA to the original image data DG on a trial basis, thereby obtaining an image equivalent to the high-quality image PQ. The integrated image data DU that is expected to be decoded is generated.

  In this case, the high-frequency subband DCH added as the additional data DA in the integrated image data DU originally corresponds to the low-frequency subband DCL. Therefore, the integrated image PU obtained by decoding the integrated image data DU is a high-resolution image, but does not match the high-quality image PQ due to the difference between the low-frequency subband DCL and the original image data DG, and is good. There is a possibility that the image quality will not be correct.

  Therefore, the high-quality image data generation device 1 targets the high-quality image PQ, compares the integrated image PU with the high-quality image PQ, and adds the integrated image PU so as to approach the high-quality image PQ. The data DA is repeatedly updated.

  Specifically, the high-quality image data generation device 1 compares the high-quality image PQ as the target image with the integrated image PU in units of pixels, and the integrated image until the difference value that is the comparison result is equal to or less than a predetermined threshold value. The additional data DA is updated by repeating a series of processes such that the high-frequency subband DCH of the hierarchical image data DC generated by hierarchically encoding the PU is set as the new additional data DA, thereby updating the integrated image PU and the high image data. The difference from the quality image PQ is reduced.

  As a result, the high-quality image data generation device 1 can decode the integrated image PU close to the high-quality image PQ as if the quality of the original image PG is improved, and extracts only the original image data DG. The integrated image data DU that can be decoded into the original image PG can be generated.

  At this time, if the integrated image data DU is stored in the hard disk drive 4, the high-quality image data generation device 1 generates both the high-quality integrated image PU and the original image PG based on the integrated image data DU. Can do.

  For this reason, the high-quality image data generation device 1 stores the integrated image data DU as the high-quality version of the original image data DG in the hard disk drive 4 and deletes the original image data DG from the hard disk drive 4, thereby The occupied capacity for the hard disk drive 4 is minimized, and as much image data as possible can be stored.

(2-2) High Quality Image Data Generation Processing When the high quality image data generation device 1 generates the integrated image data DU that is high quality image data, the high quality image data generation processing procedure is performed according to the flowchart shown in FIG. RT1 is executed.

  In practice, when the control unit 2 of the high-quality image data generation device 1 receives an instruction to improve the quality of the original image data DG through the operation unit (not shown) by the user, the high-quality image data generation processing procedure RT1. And the process proceeds to step SP1.

  In step SP1, the control unit 2 reads the original image data DG from the hard disk drive 4 via the data interface 11 (FIG. 1), decodes it with the decoder 12, generates an original image PG, and generates the original image PG as an image. The data is stored in the memory 21, and the process proceeds to the next step SP2.

  In step SP2, the control unit 2 performs high-quality image / high-resolution (high-quality) processing on the original image PG by the high-quality / high-quality processing unit 13 (FIG. 1). (FIG. 2) is generated, stored in the image memory 21, and the process proceeds to the next step SP3.

  In step SP3, the control unit 2 generates hierarchical image data DC by hierarchically encoding the high quality image PQ using the JPEG2000 system by the additional data generation unit 15 and stores the hierarchical image data DC in the data memory 22, and also stores the hierarchical image data DC. The high band sub-band DCH formed of the high band layer portion is set as the first additional data DA, and the process proceeds to the next step SP4.

  In step SP4, the control unit 2 generates the integrated image data DU by adding the additional data DA to the original image data DG on the data memory 22, and the integrated image PU is obtained by decoding the integrated image data DU with the decoder 12. This is generated, stored in the image memory 21, and the process proceeds to the next step SP5.

  In step SP5, the control unit 2 compares the high quality image PQ stored in the image memory 21 with the integrated image PU by the image comparison unit 14, and proceeds to the next step SP6.

  In step SP6, the control unit 2 uses the image comparison unit 14 to compare the pixel value difference of each pixel when the high quality image PQ and the integrated image PU are compared, and the total difference value is equal to or less than a predetermined threshold value. It is determined whether or not there is.

  If a negative result is obtained in step SP6, this means that the difference between the high quality image PQ and the integrated image PU is relatively large, and the two cannot be regarded as the same image, so that the integrated image data DU is generated. In this case, the controller 2 moves to the next step SP7.

  In step SP7, the control unit 2 generates hierarchical image data DC by performing JPEG2000 hierarchical encoding processing on the integrated image PU by the encoder 15A of the additional data generation unit 15, and newly generates the high frequency sub-band DCH. If the additional data DA is selected, the additional data DA is updated, and the process returns to step SP4 again.

  On the other hand, if a positive result is obtained in step SP6, this indicates that the difference between the high-quality image PQ and the integrated image PU is relatively small, and both can be regarded as substantially the same image. The process proceeds to the next step SP8.

  In step SP8, the control unit 2 deletes the original image data DG from the hard disk drive 4 and records the integrated image data DU on the hard disk drive 4 as the high-quality original image data DG. Then, the process proceeds to the next step SP9. The quality image data generation processing procedure RT1 is terminated.

(3) Operation and Effect In the above configuration, the high quality image data generation device 1 generates the original image PG by decoding the original image data DG with the decoder 12, and the image quality enhancement / quality enhancement processing unit 13 performs the original image PG. A high-quality image PQ is generated by improving the quality of the image PG, and the high-frequency subband DCH of the hierarchical image data DC obtained by hierarchically encoding the high-quality image PQ by the additional data generation unit 15 is added to the experimental additional data DA. Is added to the original image data DG as an initial value to generate integrated image data DU.

  Further, the high quality image data generation device 1 compares the integrated image PU and the high quality image PQ in units of pixels by the image comparison unit 14, and generates additional data until the difference value that is the comparison result is equal to or less than a predetermined threshold value. By repeating the update process of the additional data DA such that the high frequency subband DCH of the hierarchical image data DC generated by hierarchically encoding the integrated image PU by the unit 15 is used as the new additional data DA, the integrated image data DU The integrated image PU is updated to approach the high quality image PQ.

  Therefore, the high-quality image data generating apparatus 1 adds the additional data DA to the original image data DG so that the original image data DG can be separated and extracted, unlike the case where the high-quality image PQ is simply hierarchically encoded. Integrated image data DU that can be generated can be generated.

  For this reason, the high-quality image data generation device 1 can take out the original image data DG from the integrated image data DU stored in the hard disk drive 4, so that it is not necessary to store the original image data PG separately. The occupied capacity in the hard disk drive 4 can be minimized.

  The high-quality image data generation device 1 is substantially different from the high-quality image PQ obtained by actually updating the original data PG by actually updating the additional data DA, although the quality is different from the high-quality image PQ. It is possible to generate integrated image data DU that can be decoded into an integrated image PU that can be regarded as a high-quality version of the original image PG.

  In this case, the high quality image data generation device 1 uses the first additional data DA (that is, the hierarchical image obtained by hierarchically encoding the high quality image PQ) as data to be added to the original image PG in order to generate an image close to the high quality image PQ. Even if the high frequency sub-band DCH) of the data DC is not appropriate, by repeating the update of the additional data DA so as to reduce the difference between the high quality image PQ and the integrated image PU, finally the high quality An integrated image PU very close to the image PQ can be obtained.

  For this reason, the high-quality image data generation device 1 displays the integrated image PU obtained by decoding the integrated image data DU on a monitor device (not shown) or the like and allows the user to appreciate the integrated image PU as if it were the original image. The image PG can be recognized as if it were an image with improved quality.

  According to the above configuration, the high-quality image data generation device 1 generates the integrated image data DU by adding the experimental additional data DA to the original image data DG, and decodes the integrated image data DU. The image PU and the high-quality image PQ are compared in units of pixels, and the additional data DA is updated according to the comparison result to bring the integrated image PU closer to the high-quality image PQ. It is possible to generate integrated image data DU that can be decoded into the integrated image PU as a quality version and that can extract the original image data DG and decode it into the original image PG.

(4) Other Embodiments In the above-described embodiment, hierarchical image data DC is generated by hierarchically encoding the integrated image PU obtained by decoding the integrated image data DU, and the hierarchical image data DC is high. The case where the additional data DA is updated by using the regional subband DCH as the new additional data DA has been described. However, the present invention is not limited to this, and for example, the integrated image PU obtained by decoding the integrated image data DU. Hierarchical coding may be performed after performing various image quality enhancement processing such as edge enhancement processing and contrast correction.

  Furthermore, in this case, a plurality of types of images with different types of image quality enhancement processing such as edge enhancement processing and contrast correction are generated for the integrated image PU, and the difference from the highest quality image PQ (FIG. 2) among them is generated. It is also possible to select an image having a small size and perform hierarchical encoding. By selecting the high image quality processing to be performed on the integrated image PU in this way, the difference between the integrated image PU and the high quality image PQ can be further reduced.

  Further, in the above-described embodiment, a case where pixel interpolation processing or edge enhancement processing is performed on the original image PG as the quality enhancement processing by the image quality enhancement / resolution enhancement processing unit 13 (FIG. 1). As described above, the present invention is not limited to this, and various image processing such as contrast correction processing and histogram correction processing may be performed as high quality processing.

  Further, in the above-described embodiment, the integrated image data DU is configured by adding the additional data DA to the original image data DG, and the two types of the original image PG or the high-quality integrated image PU are formed from the integrated image data DU. Although the case where an image can be generated has been described, the present invention is not limited to this. For example, when the integrated image PU is hierarchically encoded, multi-layer encoding of three or more layers is performed, and the high frequency subband is further added. It may be possible to generate three or more types of images from the integrated image data DU by dividing the image into a plurality of subbands.

  Further, in the above-described embodiment, the case where the original image data DG is deleted from the hard disk drive 4 and the integrated image data DU is stored has been described. However, the present invention is not limited to this, for example, the original image data DG. Are stored without being deleted, and the final additional data DA is stored in place of the integrated image data DU. When the integrated image is decoded, the original image data DG and the final additional data DA are stored. The image data may be divided and stored such that both are read and decoded.

  Further, in the above-described embodiment, the case where the encoder 15A of the additional data generation unit 15 performs the hierarchical encoding process conforming to JPEG2000 on the high quality image PQ has been described, but the present invention is not limited thereto. Instead, for example, the high-quality image PQ may be subjected to hierarchical encoding processing by various hierarchical encoding methods such as MPEG4 FGS (Motion Pictures Expert Group 4 Fine Granular Scalability).

  Further, in the above-described embodiment, the image data generation program is executed by the decoder 12 having the hardware configuration of the control unit 2, the image quality enhancement / resolution enhancement processing unit 13, the image comparison unit 14, and the additional data generation unit 15. However, the present invention is not limited to this. For example, each of the decoder 12, the image quality enhancement / resolution enhancement processing unit 13, the image comparison unit 14, and the additional data generation unit 15 is controlled by software in the control unit 2. The function may be realized and the image data generation program may be executed.

  In this case, high-quality image data may be generated by executing the image data generation program by various information processing apparatuses such as a digital camera and a personal computer instead of the high-quality image data generation apparatus 1. .

  Further, in the above-described embodiment, the case where the image data generation program is stored in advance in the ROM (not shown) of the control unit 2 has been described. However, the present invention is not limited to this, for example, the image The data generation program is stored in another storage medium such as the hard disk drive 4, or the image data generation program is stored in a replaceable storage medium such as a CD-ROM medium or a Memory Stick (registered trademark). The image data generation program is read and executed via a CD-ROM drive (not shown) or a memory stick slot (not shown), or an external server device via a communication interface (not shown). The image data generation program may be acquired from (not shown) or the like. In this case, the image data generation program may be restored by decompressing the compressed data or by executing an installation program.

  Further, in the above-described embodiment, the decoder 12 and the high image quality / high resolution processing unit 13 as the high quality image generation unit, the additional data generation unit 15 as the integrated image data generation unit, and the additional data update unit. The case where the high-quality image data generation device 1 as the image data generation device is configured by the decoder 12 and the additional data generation unit 15 and the image comparison unit 14 as the integrated image data update unit has been described. However, the present invention is not limited to this, and the image data generation device may be configured by high quality image generation means, integrated image data generation means, additional data update means, and integrated image data update means having various other circuit configurations. good.

  The present invention can also be used in various information processing apparatuses that perform high quality processing on image data.

It is a block diagram which shows the structure of the high quality image data generation apparatus by one Embodiment of this invention. It is a basic diagram which shows the mode of the production | generation of the high quality image data by one Embodiment of this invention. It is a flowchart which shows a high quality image data generation processing procedure. It is a basic diagram which shows the mode of the production | generation of the high quality image data by the conventional hierarchical coding.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... High quality image data production | generation apparatus, 2 ... Control part, 3 ... Memory | storage part, 4 ... Hard disk drive, 12 ... Decoder, 13 ... High quality / high resolution processing part, 14 ... Image Comparison unit, 15: additional data generation unit, 15A: encoder, DG: original image data, DA: additional data, DU: integrated image data, DC: hierarchical image data, DCH: high frequency subband , PG ... Original image, PQ ... High quality image, PU ... Integrated image.

Claims (9)

Target image generating means for generating a high-quality target image by performing a predetermined quality enhancement process on the original image obtained by decoding the original image data encoded by the predetermined encoding method;
Integrated image data generating means for generating integrated image data by adding experimental additional data to the original image data to generate the target image;
An additional data update unit that generates an integrated image for comparison with the target image by decoding the integrated image data, and updates the additional data to reduce a difference between the integrated image and the target image;
An image data generation apparatus comprising: integrated image data updating means for causing the integrated image to approach the target image by repeatedly generating the integrated image data and updating the additional data. The additional data update means includes
The high-frequency part excluding the low-frequency part corresponding to the original image data in the hierarchical image data obtained by performing the hierarchical encoding process on the integrated image is used as the additional data. The image data generation device described. The additional data update means includes
The image data generation apparatus according to claim 2, wherein the hierarchical image data is generated by performing a hierarchical coding process of JPEG2000 (Joint Photographic Experts Group 2000) system on the integrated image. The additional data update means includes
3. The image data generating apparatus according to claim 2, wherein the hierarchical image data is generated by subjecting the integrated image to hierarchical encoding processing of an MPEG4 FGS (Motion Pictures Expert Group 4 Fine Granular Scalability) method. . The integrated image data generation means includes:
The high-frequency part excluding the low-frequency part corresponding to the original image data in the hierarchical image data obtained by performing hierarchical encoding processing on the target image is set as the first additional data. 2. The image data generation device according to 1. The integrated image data update means includes:
The image data generation apparatus according to claim 1, wherein the generation of the integrated image data and the update of the additional data are repeated until a difference between the integrated image and the target image becomes a predetermined threshold value or less. The target image generation means includes
The image data generation apparatus according to claim 1, wherein the high-quality target image is generated by performing high-quality image processing or high-resolution processing on the original image. A target image generation step for generating a high-quality target image by performing an image quality enhancement process or a resolution enhancement process on an original image obtained by decoding original image data encoded by a predetermined encoding method;
An integrated image data generation step of generating integrated image data by adding experimental additional data to the original image data to generate the target image;
An additional data update step of generating an integrated image for comparison with the target image by decoding the integrated image data, and updating the additional data to reduce a difference between the integrated image and the target image;
An image data generation method comprising: an integrated image data update step of causing the integrated image to approach the target image by repeatedly generating the integrated image data and updating the additional data. For information processing equipment
A target image generation step for generating a high-quality target image by performing an image quality enhancement process or a resolution enhancement process on an original image obtained by decoding original image data encoded by a predetermined encoding method;
An integrated image data generation step of generating integrated image data by adding experimental additional data to the original image data to generate the target image;
An additional data update step of generating an integrated image for comparison with the target image by decoding the integrated image data, and updating the additional data to reduce a difference between the integrated image and the target image;
An image data generation method comprising: an integrated image data update step of causing the integrated image to approach the target image by repeatedly generating the integrated image data and updating the additional data.
An image data generation program characterized in that

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