JPH09128533A - Image encoding processor and image decoding processor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To surely reduce the occurrence of block distortion and to speed up the processing by performing irreversible encoding processing and irreversible decoding processing for every unit block and synthesizing boundary data, extracted from the unit block before processing with the unit block after processing. SOLUTION: This image encoding processor 10 and this image decoding processor 20 divide the image data into the unit blocks consisting of a prescribed number of pixel data and perform irreversible encoding processing and irreversible decoding processing for every unit block. Then, boundary control means 11 and 21 extract the pixel data positioned at the peripheral edge of this unit block as boundary data and an irreversible encoding means 13 and an irreversible decoding means 23 perform irreversible encoding processing and irreversible decoding processing to the unit block after the boundary data are extracted. Synthesizing control means 14 and 24 synthesizes the boundary data extracted by the boundary control means 11 and 21 with the unit block subjected to the irreversible processing.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is intended to reduce the amount of image data when storing or transmitting the image data in, for example, an electronic filing system, a facsimile device, a videophone, an electronic publishing system, a printer device or the like. In addition, the present invention relates to an image encoding / decoding processing device that performs one or both of compression encoding and decompression decoding on this image data.

[0002]

2. Description of the Related Art Generally, as an image encoding / decoding processing device for performing compression encoding or expansion decoding on image data,
Two-dimensional Discrete Cosine Transfor
m; DCT) or its inverse transform (Inverse DCT; IDC)
A method using orthogonal transform such as T) is known (for example, Japanese Patent Laid-Open Nos. 63-308474 and 1-1739).
No. 74). In such an image encoding / decoding processing device, normally, image data is divided into a plurality of unit blocks in a predetermined division unit (8 × 8 pixels or the like), and processing such as DCT or IDCT is performed for each unit block. I am supposed to do it.

By the way, in such an image coding / decoding processing apparatus, since processing is performed for each unit block, the correlation between the unit blocks is lost, and so-called block distortion occurs at the boundary between the unit blocks. It may happen. For example, when processing is performed on image data that includes a large number of regions with little change in gray level, the gray level differs between each unit block, and a kind of tile pattern occurs in the decoded image. . Therefore, many techniques for reducing such block distortion have been proposed.

For example, in Japanese Unexamined Patent Publication No. 1-168165, a data column having a different size is added to each unit block in the sub-scanning direction (row), and the division position of the unit block in the main scanning direction (column) is added. By not making it constant for each line,
A method for preventing the occurrence of tile-like patterns is disclosed.
Further, for example, in Japanese Laid-Open Patent Publication No. 3-243066, attention is paid to the fact that a tiled pattern or the like occurs because each unit block is a square of 8 × 8 pixels, and the image data is converted into a non-square unit block. A method of splitting is disclosed.

Further, for example, in Japanese Unexamined Patent Publication No. 4-358863, when dividing each unit block, the boundary portions of adjacent unit blocks are divided so that at least one pixel overlaps, and the correlation between the unit blocks is divided. A device is disclosed that reduces the occurrence of block distortion by maintaining Further, for example, in Japanese Patent Laid-Open No. 5-316361, pixel data is compared between adjacent unit blocks when each encoded unit block is decoded, and the adjacent unit blocks are compared based on the result. An apparatus is disclosed which reduces the occurrence of block distortion at the boundary between unit blocks by performing the smoothing correction in (1).

Further, for example, in Japanese Unexamined Patent Publication No. 1-245764, each unit block is processed at least twice, and if block distortion occurs in the first processing, correction is performed in the next processing based on the result. An apparatus for reducing the occurrence of block distortion by performing the method is disclosed. Further, for example, in Japanese Unexamined Patent Publication No. 1-178286, a unit block including an image edge portion or a contour portion among the divided unit blocks, that is, a unit block in which block distortion is likely to occur, is further divided. A method of reducing the occurrence of block distortion by reducing the unit is disclosed.

[0007]

However, in the image coding / decoding processing apparatus using the above-mentioned conventional technique,
The processing for reducing block distortion causes the following technical problems. JP-A-1-16816
In the device using the method disclosed in Japanese Patent Publication No. 5, the division position in the column direction of each unit block is different for each row, so a tiled pattern or the like does not occur, but the division position in the row direction remains constant. Therefore, a striped pattern or the like may occur in the decoded image.

Further, in the apparatus using the method disclosed in Japanese Patent Laid-Open No. 24-243066, since the shape of each unit block is non-square, a tiled pattern does not occur, but since it is non-square, There is a possibility that the ratio between the high frequency component and the low frequency component may change and block distortion may increase. However, in order to not change the ratio of the high frequency component and the low frequency component, it is possible to change the shape of the non-square according to the image data, but in that case, the process for grasping the situation of the image data Therefore, the processing time is increased and the functional configuration is complicated.

Further, in the device disclosed in Japanese Patent Laid-Open No. 4-358863, it is possible to reduce the occurrence of block distortion by dividing each unit block so as to overlap each other, but the unit blocks overlap each other. Since the data amount increases by the amount of pixels, the compression rate decreases, and the process of decompressing and decoding the overlapping pixels becomes complicated, resulting in an increase in processing time. Further, in the device disclosed in Japanese Patent Laid-Open No. 5-316361, in order to perform smoothing correction for reducing the occurrence of block distortion, pixel data near the boundary between unit blocks must be compared, It spends a lot of time.

Further, in the apparatus disclosed in Japanese Patent Laid-Open No. 1-245764, one unit block must be processed at least twice in order to reduce the occurrence of block distortion. It takes processing time. Further, in the method disclosed in JP-A-1-178286, in order to reduce the occurrence of block distortion, it is determined whether or not each unit block includes an image edge portion or a contour portion, and the determination result. Since the division unit of each unit block must be changed according to the above, the processing time is increased and the functional configuration is complicated.

That is, in the image coding / decoding processing device using the conventional technique, it is not possible to sufficiently reduce the occurrence of block distortion, or it is necessary to spend a lot of processing time in order to reduce the occurrence of block distortion. It is necessary to complicate the function configuration. Therefore, according to the present invention, it is possible to suppress the occurrence of block distortion when performing compression encoding or decompression decoding on image data, and to perform a process therefor quickly. An object of the present invention is to provide a chemical treatment device.

[0012]

The present invention has been devised in order to achieve the above object, and an image coding / decoding processing apparatus according to claim 1 is configured so that image data is composed of a predetermined number of pixel data. The unit block is divided into the following unit blocks, and the lossy encoding process and / or the lossy decoding process is performed for each of these unit blocks. Boundary control means for extracting at least one pixel data located at the periphery of the boundary data as boundary data, and lossy encoding processing and / or lossy decoding for the unit block after the boundary data is extracted by this boundary control means. Lossy processing means for performing processing, and lossy encoding processing and / or
Alternatively, the unit block on which the irreversible decoding process has been performed is provided with a combination control unit for combining the boundary data extracted by the boundary control unit.

According to the configuration of the image coding / decoding processing device of the first aspect of the present invention, when the lossy processing means performs the lossy coding processing and / or the lossy decoding processing for each unit block, Boundary data extracted by the boundary control means from the unit block before processing is combined with the unit block after processing by the combining control means. That is, if the pixel data at a position facing the boundary between this unit block and another adjacent unit block is extracted as boundary data from a certain unit block, the certain unit block causes lossy encoding processing and / or lossy encoding. Even after the decoding process is performed, the same pixel data as before the process is combined at the position facing the boundary. Therefore, the correlation between the unit blocks is maintained only by combining the boundary data.

An image coding / decoding processing device according to a second aspect divides the image data into unit blocks made up of a predetermined number of pixel data, and lossy coding processing and / or non-reversible processing is performed for each of these unit blocks. Reversible decoding is performed, further, when dividing the image data into the unit blocks, so as to provide at least one pixel data row between adjacent unit blocks, and, Boundary control means for extracting the pixel data string as boundary data, lossy processing means for performing lossy encoding processing and / or lossy decoding processing on the unit blocks divided by this boundary control means, and this lossy processing means. A synthesis system that synthesizes the boundary data extracted by the boundary control unit into a unit block that has been subjected to the lossy encoding process and / or the lossy decoding process by the lossless processing unit. Characterized by comprising a means.

According to the structure of the image coding / decoding processing apparatus of the second aspect of the present invention, when the image data is divided into unit blocks, the boundary control means divides the pixel data string between the blocks into boundary data. Take out as. The lossy processing means performs lossy encoding processing and / or
Alternatively, when the lossy decoding process is performed, the boundary data extracted by the boundary control unit is combined by the combination control unit between the processed unit blocks. That is, even if the irreversible encoding process and / or the irreversible decoding process is performed for each unit block, the same pixel data sequence as before processing is combined between these unit blocks. Therefore, the correlation between the unit blocks is maintained only by combining the boundary data.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An image coding / decoding processing apparatus according to the present invention will be described below with reference to the drawings.

[First Embodiment] First, an image coding / decoding processing apparatus according to the first aspect of the present invention will be described. FIG. 1 is a block diagram showing an example of an embodiment when the present invention is applied to an image coding processing device 10 that performs compression coding processing and an image decoding processing device 20 that performs decompression decoding processing. is there. As shown in the figure, the image coding processing device 10 and the image decoding processing device 20 of the present embodiment are used by being connected to the image input device 31, the storage device 32, and the image output device 33. .

The image input device 31 is composed of, for example, a scanner or a host computer, and inputs image data composed of a plurality of pixel data. The storage device 32 is composed of, for example, a hard disk device,
The image data input by the image input device 31 is stored in the state of compression coded data described later. The image output device 33 is, for example, a printer device or a CRT (Cathode Rade).
y Tube) device, which outputs the image data restored from the compression coded data stored in the storage device 32 as a visible image.

The image encoding processing device 10 is provided between the image input device 31 and the storage device 32, and in order to reduce the data amount of the image data input by the image input device 31, The compression coding processing is performed on the image data to generate the compression coding data. Therefore, in the image encoding processing device 10, the boundary control means 11
Boundary data storage means 12 and lossy encoding means 13
And a synthesizing control means 14.

The boundary control means 11 is, for example, a CPU (Cent
The image data input by the image input device 31 is subjected to compression coding processing by a predetermined number (for example, 8 pixels in the main scanning direction × sub-scanning) of the image data. It is divided into unit blocks made up of pixel data of 8 pixels in the direction.
However, in the boundary control means 11, the image data from the image input device 31 is temporarily stored in an image buffer or the like (not shown), and a predetermined number of pixel data are stored in the image buffer according to the address information of the pixel data forming the image data. Is extracted, the image data is divided into a plurality of unit blocks.

Further, when dividing the image data into unit blocks, the boundary control means 11 uses the pixel data at a preset position in the unit blocks as boundary data based on the address information of the pixel data. It is something to take out. However, the boundary control means 11 may extract the boundary data based on the order of processing the pixel data instead of the address information of the pixel data. As a specific example of the boundary data extracted by the boundary control unit 11, for example, as shown in FIG. 2A, pixel data columns located at the upper and left peripheral edges of each unit block 40, that is, adjacent to each other. It is conceivable that every other pixel data is taken out from the pixel data row facing the boundary with the unit block as the boundary data 41. Further, for example, as shown in FIG. 2B, all the pixel data located at the upper edge and the left edge in each unit block 40 may be extracted and used as the boundary data 41.
That is, as the boundary data 41, each unit block 4
It suffices to extract at least one pixel data located at the periphery of 0.

Further, in FIG. 1, boundary data storage means 1
Reference numeral 2 is composed of, for example, a RAM (Random Access Memory), and temporarily stores the boundary data extracted by the boundary control unit 12. Lossy encoding means 1
Reference numeral 3 denotes, for example, an image processor, which is a lossy encoding process (non-reversib) for each unit block divided by the boundary control unit 11.
le coding) to generate compressed coded data from image data. The lossy coding process performed by the lossy coding means 13 is a process of compressing information by utilizing human visual characteristics, and is, for example, a compression process by the DCT method according to the JPEG algorithm.

The synthesizing control means 14 is formed by, for example, processing in the CPU, and is the irreversible encoding means 1.
When the compression coded data 3 is generated, the compression coded data and the boundary data stored in the boundary data storage means 12 are combined in a preset predetermined order, and these are sent to the storage device 32. It is to accumulate. As a predetermined order for synthesizing the compression-encoded data and the boundary data by the synthesizing control means 14, for example, as shown in FIG. It is conceivable to combine compression coded data generated from image data for pages. Further, for example, as shown in FIG. 3B, one page of image data is divided into a plurality of strip-shaped regions (hereinafter referred to as bands), and the boundary data extracted from one band is followed by the above-mentioned one. You may make it synthesize | combine the compression encoding data produced | generated from one band, and synthesize | combining about each band similarly below. That is, the compression coded data and the boundary data may be combined in any way as long as the combination control unit 14 defines in what state the data is stored in the storage device 32.

On the other hand, in FIG. 1, the image decoding processing device 20 is provided between the storage device 32 and the image output device 33, and expands the compression coded data stored in the storage device 32. The decoding process is performed to restore the image data before compression. Therefore, in the image decoding processing device 20, the boundary control means 21, the boundary data storage means 22, the lossy decoding means 23, and the synthesis control means 2
4 is provided.

The boundary control means 21 is formed by, for example, a process in a CPU, and when the compression coded data and the boundary data are extracted from the storage device 32 in order to output the image data by the image output device 33, the image code is generated. Based on the definition by the synthesis control means 14 of the chemical processing unit 10,
These are separated into compression coded data and boundary data. The boundary data storage means 22 is composed of, for example, a RAM, and temporarily stores the boundary data separated by the boundary control means 21.

The irreversible decoding means 23 is composed of, for example, an image processing processor, and performs irreversible decoding processing for each unit block on the compression coded data separated by the boundary control means 21. The image data is restored from the compression encoded data. As the irreversible decoding process performed by the irreversible decoding means 23, there is, for example, a decompression process by the IDCT method according to the JPEG algorithm. That is, the lossy decoding means 23 restores image data in which block distortion may occur, as in the conventional technique.

The synthesizing control means 24 is formed by the processing in the CPU, for example, and is the irreversible decoding means 2.
When 3 restores the image data for each unit block, the boundary data corresponding to the unit block is taken out from the boundary data storage means 22 and overlapped to combine them. However, in the synthesis control means 24,
If the pixel data forming the restored image data is related to the same position as the boundary data, that is, if there is overlapping pixel data, the pixel data is discarded.

Next, an operation example in the case of performing the compression coding processing in the image coding processing apparatus 10 configured as described above will be described with reference to the flowchart of FIG. When image data is input to the image input device 31, the image encoding processing device 10 receives the image data in order to perform compression encoding processing (step 101;
Abbreviated). Upon receiving the image data from the image input device 31, the boundary control means 11 performs, for example, a zigzag scan or the like on the image data, and divides the received image data into unit blocks composed of a predetermined number of pixel data (S102). ).

At this time, the boundary control means 11 judges, for each pixel data in the unit block, whether or not the pixel data is to be taken out as boundary data (S103). If it is determined that the pixel data is to be extracted as boundary data, the boundary control unit 11 stores the pixel data in the boundary data storage unit 12 as boundary data (S104). Then, the boundary control means 11 determines whether or not the processing for all pixel data in one unit block is completed (S105), and if not completed, the above steps are repeated again (S103 to S).
105).

When the above process is completed for all pixel data in one unit block, the lossy encoding means 13 subsequently performs the lossy encoding process for the unit block (S106). Then, when the lossy encoding process for one unit block is completed, the lossy encoding means 13 determines whether the lossy encoding process for the unit block of one page or one band of the image data is completed. The determination is made (S107), and if not completed, the above steps are repeated again (S102 to S107).

When the lossy coding means 13 completes the lossy coding processing for the unit block for one page or one band, the synthesis control means 14 causes the synthesis control means 14 for one page generated by this lossy coding processing or The compression coded data for one band and the boundary data stored in the boundary data storage means 12 corresponding to this compression coded data are combined in a predetermined order (S108). Then, the synthesizing control unit 14 sends the synthesized compression-coded data and boundary data to the storage device 32, and stores them in the storage device 32 (S109).

Next, an operation example of performing the decompression decoding process in the image decoding processing device 20 will be described with reference to the flowchart of FIG. When the compression coded data and the boundary data are accumulated in the storage device 32, the image decoding processing device 20
Then, these are taken out as needed to be output by the image output device 33 (S201). Upon receiving the compression coded data and the boundary data from the storage device 32, the boundary control unit 21 determines whether it is the compression coded data or the boundary data (S202). If it is determined that the boundary data is the boundary data, the boundary control means 21 stores the boundary data in the boundary data storage means 22 (S
203). If the boundary control unit 21 determines that the compression encoded data is the lossy decoding unit 23, the lossy decoding unit 23 performs lossy decoding processing on the compression encoded data for each unit block to restore the image data (S204). ).

When the boundary data storage means 22 stores the boundary data and the lossy decoding means 23 restores the image data, the synthesis control means 24 stores the boundary data corresponding to the restored image data in the boundary data. They are taken out of the means 22 and are combined with each other (S205). Then, the composition control unit 24 determines whether the composition of the image data for one page or one band is completed (S206), and if not completed, the above steps are repeated (S202 to S206). . When the composition of the image data for one page or one band is completed, the composition control means 24 sends the image data obtained by combining the boundary data to the image output device 33, and this image output device 3
It is output in 3 (S207).

As described above, in the image coding processing device 10 and the image decoding processing device 20 of this embodiment, even if the lossy coding process and the lossy decoding process are performed for each unit block, the processing is performed. The boundary data extracted from the unit block before processing is combined with the subsequent unit block. Therefore, even if the irreversible encoding process and the irreversible decoding process are performed between the unit blocks, the mutual correlation is maintained, and thus the block distortion can be reliably reduced. In addition, it is possible to reduce the occurrence of block distortion simply by extracting the boundary data from the unit block before processing and synthesizing the boundary data into the unit block after processing. For example, it is possible to grasp the status of image data to be processed. As a result, it is possible to perform a rapid process as a result, because it is not necessary to perform a recognition process to do so or to perform a process repeatedly for one unit block.

Further, it is possible to increase the compression rate for each unit block in anticipation that the occurrence of block distortion can be reduced by the boundary data. That is, since the same pixel data as that before the processing is combined by the boundary data on the periphery of each unit block, even if the compression rate for each unit block is increased, the occurrence of block distortion and the deterioration of image quality become inconspicuous. . Therefore, if the compression rate is increased, the amount of data after the lossy encoding process is reduced accordingly, so that further high-speed processing can be realized. However, as shown in FIG. 2A, if the boundary data extracted from each unit block is extracted so as not to be continuous in the pixel data row at the periphery of the unit block, the block distortion due to the effect of human visual characteristics may occur. Occurrence and deterioration of image quality become less noticeable.

[Second Embodiment] Next, a second embodiment of the image coding / decoding processing apparatus according to the present invention will be described. However, an embodiment relating to the invention described in claim 2 will be described here. The image coding / decoding processing apparatus according to the present embodiment is configured as shown in FIG. 1, similarly to the above-described first embodiment. However, in the present embodiment, unlike the first embodiment, the boundary control means 11 of the image encoding processing device 10 is different.
However, it has the following functions.

The boundary control means 11 divides the image data into unit blocks composed of a predetermined number of pixel data, for example, as shown in FIG. The unit block 40
The division is performed separately from the above. And
The boundary control means 11 extracts the pixel data string between the unit blocks 40 as boundary data 41. That is, the boundary control means 1 according to the present embodiment
1 is different from the first embodiment in the method of dividing the unit block 40 and extracting the boundary data 41.

Even if the unit block division and the boundary data extraction are performed as in the present embodiment, the processing is performed between the unit blocks on which the lossy encoding processing and the lossy decoding processing have been performed. Since no boundary data is combined, mutual correlation is maintained between the unit blocks. Therefore, also in the present embodiment, similarly to the first embodiment, it is possible to reliably reduce the occurrence of block distortion, and it is possible to obtain the effect that the processing therefor can be performed quickly.

Further, in the present embodiment, when the image data is divided into unit blocks, a pixel data string to serve as boundary data is provided between the unit blocks. Therefore, when this pixel data string is not provided. In comparison, the number of unit blocks divided from the image data for one page is reduced.
In other words, since the number of unit blocks to be subjected to the lossy encoding process and the lossy decoding process is reduced, the time required for these processes is reduced, and as a result, higher speed processing can be realized. .

[Third Embodiment] Next, a third embodiment of the image coding / decoding processing apparatus according to the present invention will be described. However, an embodiment according to the invention described in claim 3 will be described here. The image coding / decoding processing apparatus according to the present embodiment is configured as shown in FIG. That is, in addition to the above-described first or second embodiment, the image coding processing device 10a
The lossless encoding means 15 is provided between the boundary control means 11 and the boundary data storage means 12 of the image decoding processing apparatus 20a, and the boundary data storage means 22 and the synthesis control means 24 of the image decoding processing device 20a.
And a reversible decoding means 25 is provided between and.

The reversible encoding means 15 is composed of, for example, an image processor, and reversible encoding processing (reversible) for the boundary data extracted by the boundary control means 11.
coding). The reversible coding process is a process that does not cause data loss even if the coding is performed, and is, for example, a compression process using an MR (Modified READ) coding system or an MMR (Modified Modified READ) coding system. . The lossless decoding unit 25 is composed of an image processor or the like like the lossless encoding unit 15, and the image data subjected to the lossless encoding process by the lossless encoding unit 15 is bounded via the storage device 32. When stored in the data storage means 22, the boundary data is subjected to a lossless decoding process to restore the boundary data before the lossless encoding process.

Even in the image coding processing device 10 and the image decoding processing device 20 configured as described above, block distortion is surely generated as in the first or second embodiment described above. It is possible to obtain the effect that the amount can be reduced and the processing therefor can be performed quickly. Furthermore, since the image coding processing device 10 and the image decoding processing device 20 of the present embodiment perform the lossless coding process and the lossless decoding process on the boundary data, the data amount of the boundary data is reduced, Boundary data storage means 12,
The storage capacity of the storage device 22 and the storage device 32 can be reduced. Further, as the data amount of the boundary data is reduced, the synthesizing process in the synthesizing control unit 14, the accumulating process in the storage device 32,
The time required for the separation process and the like in the boundary control means 21 is reduced, and as a result, a higher speed process can be realized.

[Fourth Embodiment] Next, a fourth embodiment of the image coding / decoding processing apparatus according to the present invention will be described. As shown in FIG. 8, the image coding / decoding processing device according to the present embodiment is provided with an image decoding processing device 20.
The smoothing correction means 26 is provided in b. The smoothing correction means 26 is, for example, a two-dimensional low-pass filter, 1
Dimensional vertical low-pass filter, one-dimensional horizontal low-pass filter, etc., and performs smoothing processing on image data restored by the irreversible decoding process by referring to pixel data near the boundary between adjacent unit blocks. Thus, the distortion between the adjacent unit blocks is corrected.

However, boundary data is combined with the unit block to be smoothed by the smoothing correction means 26 by the combination control means 24. That is, pixel data that has not been subjected to lossy encoding processing and lossy decoding processing is combined at the boundary portion of the unit block.
Therefore, in the smoothing correction means 26, by referring to the boundary data when performing the smoothing process, it is possible to perform the smoothing process with reference to less pixel data than in the case where the boundary data is not combined. . Thus, in the image decoding processing device 20b of the present embodiment, the smoothing correction means 26
Performs a smoothing process, it is possible to further reduce the occurrence of block distortion. Further, at this time, if the smoothing process is performed with reference to the boundary data, the process can be performed at a higher speed than in the conventional case where the boundary data is not synthesized.

In the above-described first to fourth embodiments, the image coding processing device 10 and the image decoding processing device 2 are used.
0 and 0 are provided as separate devices, respectively, but the present invention is not limited to this, and for example, these are provided integrally, and the lossy encoding process and the non-reversible encoding process can be performed by one device. It may be configured to perform both the lossless decoding process. Also, the first to the fourth
In the embodiment, the case where the storage device 32 is provided between the image coding processing device 10 and the image decoding processing device 20 has been described, but the present invention is not limited to this. For example, the present invention is applicable even when a communication line such as a public line or a local area network (LAN) is provided instead of the storage device 32.

[0046]

As described above, in the image coding / decoding processing apparatus of the present invention, even if the lossy coding processing and the lossy decoding processing are performed for each unit block, the unit after processing is processed. Boundary data extracted from the unit block before processing is combined with the block. Therefore,
Even if the irreversible encoding process and the irreversible decoding process are performed between the unit blocks, the mutual correlation is maintained, so that the block distortion can be reliably reduced. In addition, by extracting the boundary data from the unit block before processing and synthesizing this into the unit block after processing,
Since it is possible to reduce the occurrence of block distortion, there is an effect that complicated processing is not required and, as a result, rapid processing can be performed.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a schematic configuration of a first embodiment of an image encoding / decoding processing device according to the present invention.

FIG. 2 is a diagram illustrating boundary data in the image encoding processing device and the image decoding processing device in FIG.
Is an explanatory view showing one specific example, and (b) is an explanatory view showing another specific example.

FIG. 3 is a diagram for explaining composition of compression encoded data and boundary data in the image encoding processing device of FIG.
(A) is explanatory drawing which shows one specific example, (b) is explanatory drawing which shows another specific example.

4 is a flowchart showing an operation example in the case of performing compression encoding processing in the image encoding processing device in FIG.

5 is a flowchart showing an operation example in the case of performing decompression decoding processing in the image decoding processing device in FIG. 1. FIG.

FIG. 6 is an explanatory diagram showing a specific example of boundary data in the second embodiment of the image encoding / decoding processing device according to the present invention.

FIG. 7 is a block diagram showing a schematic configuration of a third embodiment of an image encoding / decoding processing device according to the present invention.

FIG. 8 is a block diagram showing a schematic configuration of a fourth embodiment of an image encoding / decoding processing device according to the present invention.

[Explanation of symbols]

 10, 10a Image coding processing device 11, 21 Boundary control means 13 Lossy coding means 14, 24 Synthesis control means 15 Lossless coding means 20, 20a, 20b Image decoding processing device 23 Lossy decoding means 25 Lossless decoding Conversion means 40 unit block 41 boundary data

Claims (3)

[Claims] 1. An image encoding / decoding processing device that divides image data into unit blocks made up of a predetermined number of pixel data and performs lossy encoding processing and / or lossy decoding processing for each unit block. A boundary control unit that extracts, as boundary data, at least one pixel data located on the periphery of the unit block among the pixel data that forms the unit block; and after the boundary data is extracted by the boundary control unit. A lossy processing unit that performs lossy encoding processing and / or lossy decoding processing on a unit block, and a unit block that has been subjected to lossy encoding processing and / or lossy decoding processing by the lossy processing unit An image coding / decoding processing device, further comprising: synthesis control means for synthesizing the boundary data extracted by the boundary control means. 2. An image compression encoding / decoding processing device that divides image data into unit blocks made up of a predetermined number of pixel data, and performs lossy encoding processing and / or lossy decoding processing for each unit block. When dividing the image data into the unit blocks, a division is made so that at least one pixel data row is provided between mutually adjacent unit blocks, and the pixel data row is extracted as boundary data. Control means; lossy processing means for performing lossy encoding processing and / or lossy decoding processing on the unit blocks divided by the boundary control means; and lossy encoding processing and / or lossy processing means for the lossy processing means. Alternatively, the image code is characterized by further comprising: synthesis control means for synthesizing the boundary data extracted by the boundary control means in a unit block that has been subjected to lossy decoding processing. Decoding / decoding processing device. 3. The lossless processing means for performing lossless encoding processing and / or lossless decoding processing without data loss on the boundary data extracted by the boundary control means is provided. 1. The image encoding / decoding processing device described in 1 or 2.