JP2000013610A - Method and device for generating coded image file, method and device for decoding and computer readable record medium recording program making computer execute coded image file generating method and decoding method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To perform decoding in a desired area at the time of decoding a coded image file that is obtained by spatially dividing an image into plural area and coding image data in each area. SOLUTION: An image represented by image data S is divided into plural areas, a compressing means 4 compresses the image data in each area and a compressed image file F is obtained. An inputting means 2 inputs a priority at the time of expanding compressed image data in each area and information about the existence of progressive reproduction, and a decoding information producing means 5 produces decoding information I. And the information I is given to the file F. The information I is referred to at the time of decoding the file F and first, an area that has a high priority is expanded and reproduced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an encoded image file creating method and apparatus for encoding image data to create an encoded image file, a decoding method and apparatus, and an encoded image file creating method and decoding method. The present invention relates to a computer-readable recording medium storing a program to be executed by a computer.

[0002]

2. Description of the Related Art When decoding image data which has been encoded by compression or the like and displaying it on a reproducing device such as a monitor, the image is displayed after decoding the entire image data. On the other hand, when the image is spatially divided into a plurality of tile-shaped regions and image data in a file format encoded so as to be accessible for each image data in each region is reproduced,
The decoding is performed for each area, and the entire image is reproduced.

On the other hand, as a storage format of image data, J
There are various formats such as PEG, GIF, TIFF,
In recent years, a format has been proposed in which image data is hierarchically decomposed for each resolution or density resolution, and data (hierarchical data) for each hierarchy is encoded and stored in a compressed form. This storage format is
Specifically, the image data is decomposed into a plurality of hierarchical data for each resolution or each density resolution by wavelet transform or the like, and the decomposed hierarchical data for each resolution or each density resolution is coded in a hierarchical order and is formed as one file. It is compressed and stored.

This storage method has the following features.

(1) D used in conventional JPEG
Unlike the CT (Digital Cosine Transfer) method, since image data is not processed for each block, artifacts such as block distortion do not occur.

(2) Since the image data is hierarchically encoded, only the information of the resolution required at the time of transferring the image data needs to be transferred, and efficient image transfer is possible.

(3) Since image data is decomposed into multiple resolutions or multiple density resolutions, various image processing such as frequency emphasis processing can be performed relatively easily.

(4) Space and frequency can be simultaneously decomposed by multi-resolution analysis, and orthogonal transform is performed in a wide range for a low frequency region that greatly affects coding efficiency, and is performed for a high frequency region. Since the orthogonal transformation can be performed in a narrow range, even if quantization noise occurs around the edge in the image, the spatial spread can be suppressed. For this reason, noise is not easily perceived.

A file format that can store a plurality of data having different properties in one file has been proposed, such as a FlashPix file proposed by Eastman Kodak Company.
It is also possible to store hierarchical data decomposed into multiple resolutions or multiple density resolutions in a Pix standard file.

On the other hand, when image data in which images are hierarchized is displayed on a monitor or the like, as in the above-described storage or FlashPix standard file, data of low resolution or low density resolution (hereinafter represented by resolution) is used. Up to high-resolution data is sequentially transferred to a monitor, and the monitor sequentially reproduces an image from the transferred low-resolution data. This is referred to as progressive transfer (or progressive playback in the case of playback), and when progressively transferred data is displayed on a monitor, the entire low-resolution image is displayed first, and then as the resolution of the transferred data increases, The image is reproduced so as to gradually become a clear image from a low-resolution blurred image.

Also, in such a file format that can be progressively reproduced, as described above, the image of each layer is divided into a plurality of tiled areas, and the file is constructed so that each area can be accessed. Can be.

[0012]

However, when reproducing image data in a file format in which an image is divided into a plurality of regions and encoded as described above, each region is decoded at random and reproduced. Therefore, even if the information for confirming the content of the image is included only in a part of the image, the content cannot be confirmed until the entire image is reproduced. For example, as shown in FIG. 19, when progressively reproducing an image including character information such as a shooting location and a date such as “Shinjuku” and “9805019”, FIG. 20 is displayed in the middle of the progressive reproduction.
As shown in (1), characters cannot be read at all, and the contents of the characters cannot be confirmed until an image having the highest resolution is reproduced. For this reason, even if it is desired to confirm the character area first, it is necessary to wait until the progressive reproduction is performed together with other areas, and it takes a long time to confirm the character content.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and when reproducing an encoded image file obtained by dividing an image into a plurality of regions and encoding the reproduced image, a desired region is reproduced in an arbitrary order. It is an object of the present invention to provide a computer-readable recording medium on which a program for causing a computer to execute an encoded image file creating method and apparatus, a decoding method and apparatus, and an encoded image file creating method and a decoding method are recorded. Things.

[0014]

A first coded image file creating method according to the present invention is to divide an image into a plurality of regions spatially and encode image data representing an image for each region. Decoding information specifying a decoding method for each area is added to the obtained encoded image file.

Here, "encoding" means compressing the image data in a predetermined format, arranging the image data in a predetermined format, and adding header information indicating the format format of the image data to a file. This means that processing is performed on image data so that an image cannot be reproduced unless certain processing is performed.

[0016] In the encoded image file creating method according to the present invention, it is preferable that the decoding information is added to the encoded image file as a file separate from the encoded image file.

Further, according to a second method for creating an encoded image file according to the present invention, an image is spatially divided into a plurality of regions,
In an encoded image file creating method for creating an encoded image file by encoding image data representing an image for each area, the encoded image file is created together with decoding information specifying a decoding method for each area. It is characterized by the following.

In the first and second encoded image file creation methods, it is preferable that the decoding information is information indicating a decoding order of each of the areas.

An encoding method according to the present invention is a method for decoding an encoded image file created by the encoded image file creating method according to the present invention, wherein the decoding information is read, and based on the decoding information. Decoding the encoded image file for each area.

A first encoded image file creating apparatus according to the present invention divides an image into a plurality of regions spatially and encodes image data representing an image for each region. Decoding information assigning means for assigning, to a file, decoding information designating the decoding method for each area is provided.

[0021] In the first encoded image file creating apparatus according to the present invention, the decoding information providing means includes:
It is preferable that the decoding information is added to the encoded image file as a file separate from the encoded image file.

A second encoded image file creating apparatus according to the present invention is a code for creating an encoded image file by spatially dividing an image into a plurality of regions and encoding image data representing an image for each region. Image file creation device,
Means for creating the encoded image file together with decoding information for specifying a decoding method for each area.

In the first and second encoded image file creating devices according to the present invention, it is preferable that the decoding information is information indicating a decoding order of each of the areas.

[0024] An encoding device according to the present invention is a decoding device for decoding an encoded image file obtained by the encoded image file creating device according to the present invention, wherein a reading means for reading the decoded information; Decoding means for decoding the encoded image file for each area based on the decoding information.

It should be noted that a program for causing a computer to execute the processes performed in the above-described encoded image file creation method and decoding method may be provided by being recorded on a computer-readable recording medium.

Also, the encoded image file created by the encoded image file creating method according to the present invention may be recorded on a computer-readable recording medium and provided.

[0027]

According to the present invention, the decoding information specifying the decoding method for each of the spatially divided areas is added to the encoded image file. Alternatively, information such as the presence or absence of decryption can be added. Therefore, when decoding an encoded image file including character information and the like, based on the decoding information,
It is possible to decode an area containing character information etc. before other areas, or not to decode unnecessary areas, etc., and to check the desired area by playing back the encoded image data. Can be done quickly.

[0028]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram showing the configuration of an encoded image file creating apparatus according to the first embodiment of the present invention. As shown in FIG. 1, an encoded image file creating apparatus according to the first embodiment includes an encoding unit 1 for encoding and compressing image data S, and a keyboard and a mouse for performing various inputs to the encoding unit 1. And the like, and a monitor 3 for displaying the image data S. In the first embodiment, it is assumed that the image data S representing the image shown in FIG. 19 is encoded.

The encoding means 1 converts the image represented by the image data S into twelve square areas A0 to A0 as shown in FIG.
A compression unit 4 that divides tiles into A11 and encodes image data S for each area to obtain a compressed image file F, and creates decoding information for decoding each of the areas A0 to A11 in the compressed image file F And decryption information creating means 5.

Next, the operation of this embodiment will be described. FIG. 3 is a flowchart showing processing performed in the encoded image file creating device according to the first embodiment. When the image data S is input to the encoding means 1, the image data S is displayed on the monitor 3 as shown in FIG. 19 (step S1). At this time, although not shown in FIG. 19, the image data S is divided into tiles in step S2, and the image is displayed on the monitor 3 together with a line indicating the boundary of the tile division. While observing the image displayed on the monitor 3, the user designates an area to be preferentially decoded or an area to be progressively reproduced from the input means 2. In this embodiment, the region A11 shown in FIG.
Is played back preferentially and progressively. Then, when an instruction to decode is input from the input unit 2, the image data S is encoded for each of the divided areas A0 to A11 (step S3).

The image data S for each of the areas A0 to A11 is decomposed into hierarchical data for each layer and encoded.
First, as shown in FIG. 4A, the image data S for each of the areas A0 to A11 is subjected to wavelet transform and decomposed into four data LL1, HL0, LH0 and HH0 for a plurality of resolutions. Here, the data LL1 is obtained by dividing the length and width of the image by 1 /.
The data HL0, LH0, and HH0 represent images of vertical edge, horizontal edge, and oblique edge components, respectively. Then, as shown in FIG. 4B, the data LL1 is further subjected to wavelet transform to obtain four data LL2, HL1, LH1 and HH1. Here, the data LL2 represents an image obtained by further reducing the length and width of the data LL1 to １ ／, and the data HL2
1, LH1 and HH1 represent images of the vertical edge, the horizontal edge, and the oblique edge component of the data LL1, respectively. Then, the data LL obtained each time the wavelet transform is performed is repeated as many times as desired by the wavelet transform to obtain data for a plurality of resolutions. Thereafter, as shown in FIG. 4C, the data for each resolution is encoded, and the encoded data is made into one piece of compressed image data as hierarchical data. And each area A0
Compressed image data for each of A1 to A11 is one compressed image file F.

After the image data S has been encoded in this manner, in step S4, the decoding information I is created in the decoding information creating means 5 based on the information about the decoding input from the input means 2. You. The decoding information I is added to the compressed image file F. FIG. 5 is a diagram showing the file structure of the compressed image file F. FIG.
As shown in the figure, the compressed image file F has a header section B in which information necessary for reading the compressed image file F, such as the number of tiles and the data format of the compressed image file F, is recorded.
1, a part B2 in which decompression priority is recorded, a part B3 in which progressive reproduction information is recorded, and a part B4 in which compressed image data for each of the areas A0 to A11 is recorded.

The part B2 in which the decompression priority is recorded is composed of twelve recording areas corresponding to the areas A0 to A11, and the numbers recorded in the recording areas are represented by hexadecimal numbers, with 0 being the lowest priority. , F are set to have the highest priority. In the present embodiment, the area A11
"F" is recorded in the recording area corresponding to
"0" is recorded in the recording area corresponding to .about.A10.

Part B where progressive reproduction information is recorded
Numeral 3 is composed of 12 recording areas corresponding to the areas A0 to A11, where "0" is recorded when progressive reproduction is not performed, and "1" is recorded when progressive reproduction is performed. In the present embodiment, “1” is recorded in the recording area corresponding to the area A11, and “0” is recorded in the recording areas corresponding to the other areas A0 to A10.

The portion B4 where the compressed image data is recorded is composed of twelve recording areas corresponding to the compressed image data of the areas A0 to A11, and the compressed image data of the areas A0 to A11 is recorded in each recording area.

Then, the compressed image file F thus created is stored in the network
Alternatively, the data is output to recording means for recording data on a recording medium.

FIG. 6 is a block diagram showing the configuration of the decoding device according to the first embodiment of the present invention. As shown in FIG. 6, the decoding device according to the first embodiment includes a compressed image file F created by the encoded image file creating device.
Decoding means 6 comprising decoding means 7 for reading out the decoding information I contained in the compressed image file F and inputting it to the decoding means 7;
And a monitor 9 for reproducing the image decompressed by the above.

Next, the operation of the first embodiment will be described. FIG. 7 is a flowchart showing processing performed in the decoding device according to the first embodiment. First, when the compressed image file F is input to the decoding means 6, the decoding information I attached to the compressed image file F is read by the decoding information reading means 8 in step S11. The read decoding information I is input to the decompression means 7. The decompression means 7 decompresses the compressed image data in the order of higher priority based on the decoding information I (step S12). In the present embodiment, first, decompression is performed from the compressed image data corresponding to the area A11.
Next, in step S13, it is determined whether or not progressive reproduction is designated for the decompressed compressed image data. In the present embodiment, since progressive playback is designated for the area A11, the area A11
Is progressively reproduced on the monitor 9 while being decompressed in order from the low-resolution hierarchical data. FIG. 8 shows a state during the progressive reproduction.

When the area A11 is displayed up to the highest resolution as shown in FIG. 9, it is determined in step S15 whether or not all the areas have been reproduced. Step S15
Is negative, the process returns to step S12, and the other areas A0 to A0 are returned.
The compressed image data corresponding to A10 is decompressed. Here, in the present embodiment, since progressive playback is not specified for the regions A0 to A10, step S13 is denied, and the hierarchical data of all resolutions of the compressed image data corresponding to each of the regions A0 to A10 is decompressed. After the images are reconstructed, the images of the areas A0 to A10 are reproduced on the monitor 9 (step S16). As a result, FIG.
The entire image is reproduced as shown in FIG. When the entire image has been reproduced, step S15 is affirmed and the process ends.

As described above, in the first embodiment,
When creating the compressed image file F, each area A0 to A1
1 is given to the compressed image file F as the decoding information I, and the priority at the time of decompressing the compressed image file 1 is given to the compressed image file F based on the decoding information I. If the area with a higher priority is reproduced first, and progressive reproduction is designated, the designated area is progressively reproduced. Therefore, as shown in FIG. 19, the area A11 of the image including the character information such as the shooting location and the shooting date and time of the image is changed to other areas A0 to A10 as shown in FIG.
Since the reproduction can be performed earlier than before, the character content included in the image can be quickly confirmed.

In the first embodiment, the progressive reproduction is designated for the area A11. However, when the progressive reproduction is not designated, the area A11 has the highest resolution as shown in FIG. Then, the other areas A0 to A10 are reproduced.

In the first embodiment, each area A1 to A11 is divided into a square as shown in FIG. 2. For example, in an image including a person, the area of the person and other areas are divided. Like a region, it may be divided into an arbitrary shape.

Next, a second embodiment of the present invention will be described.

FIG. 10 is a block diagram showing the configuration of an encoded image file creating device according to the second embodiment of the present invention. As shown in FIG. 10, an encoded image file creating apparatus according to the second embodiment includes an encoding unit 11 for encoding and compressing image data S, and a keyboard and a mouse for performing various inputs to the encoding unit 11. Input means 12 such as
And a monitor 13 for displaying the image data S. In addition,
In the second embodiment, it is assumed that image data S representing the image shown in FIG. 12 is compressed. The encoding unit 11 converts the image represented by the image data S into one as shown in FIG.
Compression means 14 that divides tiles into two areas A0 to A11 and encodes image data S for each area to obtain a compressed image file F;
Decoding information creating means 15 for creating decoding information I for decoding every A11 as a decoding information file FI.

Next, the operation of the second embodiment will be described. FIG. 13 is a flowchart showing processing performed in the encoded image file creating device according to the second embodiment. When the image data S is input to the encoding means 11, the image data S is transmitted to the monitor 13 as shown in FIG.
Is displayed (step S21). At this time, although not shown in FIG. 12, the image data S is stored in step S22.
, And the image is displayed on the monitor 13 together with a line indicating the boundary of the tile division. While observing the image displayed on the monitor 13, the user designates a region to be preferentially decoded from the input unit 12.
In the present embodiment, the decoding information for preferentially decompressing the area A10 including the character “Shinjuku” and “98
And decoding information for preferentially decompressing the area A11 including the character “0519”. Then, when an instruction to decode is input from the input unit 12, the image data S is encoded for each of the divided areas A0 to A11 (step S23). Note that the image data S for each of the areas A0 to A11 is decomposed and encoded into hierarchical data for each hierarchical level, as in the first embodiment.

As described above, when the image data S is encoded, the decoding information creating means 15 causes the input means 1
A decryption information file FI is created based on the decryption information input from Step 2 (Step S24). FIG. 14 is a schematic diagram showing the file structure of the decryption information file FI. As shown in FIG.
I is a header portion B10 in which information necessary to read the decoding information file FI such as the number of tiles and the file format of the decoding information file FI, a portion B11 in which the first decompression priority is recorded, and a second portion B11. Is composed of a part B12 in which the decompression priority order is recorded.

The portions B11 and B12 in which the first and second decompression priorities are recorded are the ones corresponding to the areas A0 to A11.
The number recorded in the recording area is represented by a hexadecimal number, with 0 being the lowest priority and F being the highest priority. In the second embodiment, “F” is recorded in the recording area corresponding to the area A10 of the portion B11 in which the first decompression priority is recorded, and the recording areas corresponding to the other areas A0 to A9 and A11 are recorded. “0” is recorded. Further, “F” is recorded in a recording area corresponding to the area A11 of the portion B12 in which the second priority is recorded, and “0” is recorded in recording areas corresponding to the other areas A0 to A10.

Then, the decryption information file FI created in this way is output together with the compressed image file F to a network or a recording means for recording data on a recording medium in step S25.

FIG. 15 is a block diagram showing the configuration of the decoding device according to the second embodiment. As shown in FIG. 15, the decoding apparatus according to the second embodiment converts the decoding information I from the decoding information file FI and the decompression means 17 for decompressing the compressed image file F created by the encoded image file creating apparatus. It comprises a decoding means 16 comprising decoding information reading means 18 and input means 20 for reading and inputting to decoding means 17, and a monitor 19 for reproducing the image decompressed by the decompression means 17.

Next, the operation of the second embodiment will be described. FIG. 16 is a flowchart showing processing performed in the decoding device according to the second embodiment. First,
When the compressed image file F and the decoding information file FI are input to the decoding means 16, the decoding information I is read from the decoding information file FI by the decoding information reading means 18 in step S31. Next, in step S32, the decompression priority is selected based on the input from the input unit 20 by the user, and the decoding information I relating to the selected decompression priority is input to the decompression unit 17. The decompression means 17 decompresses the compressed image data in order from the area having the highest priority based on the decoding information I (step S33). Here, if the first decompression priority is selected, decompression is first performed from the compressed image data corresponding to the area A10. Then, when the compressed image data corresponding to the area A10 is decompressed, an area A10 including the character "Shinjuku" is displayed on the monitor 19 as shown in FIG. 17 (step S34).

Next, in step S35, it is determined whether or not all the areas have been reproduced. If step S35 is denied, the process returns to step S33, and the other areas A0 to A9,
The compressed image data corresponding to A11 is decompressed and each area A
The images 0 to A9 and A11 are reproduced on the monitor 19. Thereby, the entire image is reproduced as shown in FIG.
When the entire image has been reproduced, step S35 is affirmed and the process ends.

If the second decompression priority is selected in step S32, the decompression is first performed from the compressed image data corresponding to the area A11, and as shown in FIG. A11 is displayed on the monitor 19, and thereafter, other areas A0 to A10 are displayed.

As described above, in the second embodiment,
When creating the compressed image file F, each area A0 to A1
Since the priority at the time of decompressing 1 is output as the decoding information file FI, when decoding the compressed image file F, the higher the priority, the higher the area is reproduced. Also, by recording two types of decompression priorities in the decoding information file, when there are a plurality of areas to be displayed first, it is possible to determine in advance which of the areas to decompress first by input means 2.
By designating from 0 and selecting the decompression priority when decompressing the compressed image file F, a desired area can be decompressed first. Therefore, as in the case of the image shown in FIG. 12, even when the information about the shooting location of the image and the information about the shooting date and time exist in the separate areas A10 and A11, the areas A10, Since any one of A11 can be reproduced before the other area, the character content included in the image can be quickly confirmed.

In the second embodiment, the decoding information regarding the presence or absence of the progressive reproduction may be included in the decoding information file FI. in this case,
The area for which the progressive reproduction is designated will be progressively reproduced in the same manner as in the first embodiment.

In the second embodiment, 2
Although the type of decompression priority can be specified, the decoding information file I may be created by specifying one type or three or more types of decompression priority. In the first embodiment, not only one type of decompression priority but also two or more types of decompression priority may be included in the compressed image file F as decoding information.

Further, in the first and second embodiments, the image data S is hierarchized for each resolution, but may be hierarchized for each density resolution. An image obtained by progressively reproducing data hierarchized for each density resolution in this manner is an image in which the density gradually becomes clear.

In the first and second embodiments, the image data S is hierarchized and encoded as shown in FIG. 4. However, the present invention is not limited to this. The compressed image file F may be created by encoding. Further, the encoding is not limited to compression, and the image data S is arranged in a predetermined format.
The file includes various contents such as adding header information indicating the format of the image data S to the file.

Further, in the first and second embodiments, the priority at the time of decompression is specified as the decoding information I. However, the presence or absence of decompression may be specified for each area. In this case, when decompressing, only the designated area is reproduced, and when not decompressing, the designated area is not reproduced.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of an encoded image file creating device according to a first embodiment of the present invention.

FIG. 2 is a diagram showing a state in which an image is divided into tiles;

FIG. 3 is a flowchart showing processing performed in the encoded image file creating device according to the first embodiment;

FIG. 4 is a diagram showing a state in which image data is wavelet transformed and encoded for each layer.

FIG. 5 is a diagram showing a file configuration of an encoded image file.

FIG. 6 is a block diagram showing a configuration of a decoding device according to the first embodiment of the present invention.

FIG. 7 is a flowchart showing processing performed in the decoding device according to the first embodiment;

FIG. 8 is a diagram showing an image during progressive playback.

FIG. 9 is a diagram showing an image on which progressive reproduction has been completed.

FIG. 10 is a block diagram showing a configuration of an encoded image file creating device according to a second embodiment of the present invention.

FIG. 11 is a diagram showing a state in which an image is divided into tiles.

FIG. 12 is a diagram showing an image to be encoded in the second embodiment.

FIG. 13 is a flowchart showing processing performed in the encoded image file creation device according to the second embodiment.

FIG. 14 is a diagram showing a file configuration of a decryption information file.

FIG. 15 is a block diagram showing a configuration of a decoding device according to a second embodiment of the present invention.

FIG. 16 is a flowchart showing processing performed in the decoding device according to the second embodiment;

FIG. 17 is a diagram showing an image reproduced in the second embodiment (part 1).

FIG. 18 is a diagram showing an image reproduced in the second embodiment (part 2).

FIG. 19 is a diagram showing an image including character information.

FIG. 20 is a diagram showing an image to be progressively reproduced.

[Explanation of symbols]

 1,11 Encoding means 2,12,20 Input means 3,9,13,19 Monitor 4,14 Compression means 5,15 Decoding information creation means 6,16 Decoding means 7,17 Decompression means 8,18 Decoding Information reading means

 ──────────────────────────────────────────────────続 き Continuation of the front page (54) [Title of the Invention] Coded image file creation method and device, decoding method and device, and recorded program for causing a computer to execute the encoded image file creation method and decoding method Computer readable recording medium

Claims (19)

[Claims] 1. A decoding method for each of the regions is performed on an encoded image file obtained by dividing an image spatially into a plurality of regions and encoding image data representing the image of each region. A method for creating an encoded image file, characterized by adding designated decoding information. 2. The method according to claim 1, wherein the decoding information is added to the encoded image file as a file separate from the encoded image file. 3. The method according to claim 1, wherein the decoding information is information indicating a decoding order of each of the areas. 4. An encoded image file creating method for spatially dividing an image into a plurality of regions, encoding image data representing the image of each region, and creating an encoded image file, And generating the encoded image file together with decoding information for specifying an encoding method. 5. The method according to claim 4, wherein the decoding information is information indicating a decoding order of each of the areas. 6. A decoding method for decoding an encoded image file obtained by the encoded image file creation method according to claim 1, wherein the decoding information is read out. A decoding method for decoding the encoded image file for each area based on decoding information. 7. A decoding method for each area is described for an encoded image file obtained by spatially dividing an image into a plurality of areas and encoding image data representing an image for each area. What is claimed is: 1. An encoded image file creating apparatus, comprising: decoding information adding means for adding specified decoding information. 8. The encoded image file according to claim 7, wherein the decoding information adding unit is a unit that adds the decoded information to the encoded image file as a file separate from the encoded image file. Encoded image file creation device. 9. The method according to claim 7, wherein the decoding information is information indicating a decoding order of each of the areas. 10. An image is spatially divided into a plurality of regions,
An encoded image file creating apparatus that encodes image data representing an image for each area to create an encoded image file, wherein the encoded image file is created together with decoding information that specifies a decoding method for each area. An encoded image file creating apparatus comprising: 11. The decoding information according to claim 10, wherein the decoding information is information indicating a decoding order of each of the areas.
How to create an encoded image file as described. 12. A decoding device for decoding an encoded image file obtained by the encoded image file creation device according to claim 7, wherein the decoding information is read. Decoding means for decoding the coded image file for each area based on the decoding information. 13. An image is spatially divided into a plurality of regions,
A method for creating an encoded image file, comprising the steps of: adding, to an encoded image file obtained by encoding image data representing an image for each area, decoding information designating a decoding method for each area. And a computer-readable recording medium on which a program for causing a computer to execute the program is recorded. 14. The recording medium according to claim 13, wherein said step is a step of adding said decoding information to said encoded image file as a file separate from said encoded image file. 15. The decoding method according to claim 13, wherein the decoding information is information indicating a decoding order of each of the areas.
Or the recording medium according to 14. 16. The image is spatially divided into a plurality of regions,
A computer-readable recording medium storing a program for causing a computer to execute an encoded image file creation method of creating image data by encoding image data representing an image of each area, and decoding each area. Recording medium having a procedure for creating the encoded image file together with decoding information for specifying an encoding method. 17. The decoding method according to claim 16, wherein the decoding information is information indicating a decoding order of each of the areas.
The recording medium according to the above. 18. A computer readable recording program for causing a computer to execute a decoding method for decoding an encoded image file obtained by the encoded image file creating method according to claim 1. Description: A recording medium, the program comprising: a step of reading the decoding information; and a step of decoding the encoded image file for each area based on the decoding information. Medium. 19. A computer-readable recording medium on which an encoded image file obtained by the encoded image file creating method according to claim 1 is recorded.