CN103581674A - Video data compression or decompression method and system - Google Patents
Video data compression or decompression method and system Download PDFInfo
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- CN103581674A CN103581674A CN201210279115.XA CN201210279115A CN103581674A CN 103581674 A CN103581674 A CN 103581674A CN 201210279115 A CN201210279115 A CN 201210279115A CN 103581674 A CN103581674 A CN 103581674A
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Abstract
The invention provides a video data compression or decompression method and system. The compression method includes the steps that (1) video data in a storage are divided into a plurality of basic units of a unified size; (2) the basic units are read; (3) the read basic units are compressed, and then compressed units of a preset size are acquired; (4) the compressed units are stored in the storage.
Description
Technical field
The present invention relates to compressing/decompressing method and the system of video data, especially, the present invention relates to compressing/decompressing method and the system of video data that can random access.
Background technology
The emphasis of existing video data compression method design is mainly in the efficiency of data compression, be mainly used in storage and the transmission field of video data, object is to reduce the needed space of Video Data Storage and video data needed bandwidth in network transmission process.
Yet in multimedia ASIC design, the read-write stage that the main bandwidth demand of ASIC inside and bandwidth bottleneck concentrate on video data, writing out of the reconstruction video view data that for example video decode obtains, demonstration of the reconstructed image data that video decode obtains etc. all can take bandwidth resources in a large amount of sheets.If the video data to output first carries out compressed encoding and writes out, when reading video data, first decode to process shows again, by the bandwidth that effectively reduces data and transmit between each module of ASIC inside.
Traditional compression method of take the video data that compression efficiency is design object, nature can cause having very strong data dependence between the context of data after compression, be difficult to realize being accurate to macro block rank, the even arbitrary access of the video data of the small scale such as piece rank, be therefore difficult to be applied to above-mentioned occasion.
Summary of the invention
On the one hand, the compression method of video data of the present invention and system are divided into video data the elementary cell (TILE) with unified size, using this elementary cell as compression or the basic object of decompression, each elementary cell is compressed or decompression operation independently, make do not possess correlation between the compression of each elementary cell or decompression result, thereby realize the random access to each elementary cell.
On the other hand, the compression method of video data of the present invention and system are based on determining compression ratio or Ratios compresses elementary cell, obtain having the compression unit of unified specification, make compression unit in memory, there are fixing address and mapping relations, effectively improved random-access efficiency.
To achieve these objectives, one aspect of the present invention has proposed a kind of compression method of video data, and the method comprises:
1) video data in memory is divided into a plurality of elementary cells with unified size;
2) read described elementary cell;
3) the described elementary cell reading is compressed and is obtained having the compression unit of preliminary dimension;
4) described compression unit is saved in memory.
Preferably, in step 3), with level pressure contracting comparison elementary cell, compress, obtain having the compression unit of unified preliminary dimension.
Preferably, in step 3), with Ratios, elementary cell is compressed.
Preferably, in step 3), described elementary cell measure-alike before the size that makes the described compression unit after compression and compression, and record the length information of the valid data in each compression unit; And in step 4), the length information of the valid data in each compression unit is saved in previously selected storage space.
Preferably, in step 4), first described length information is kept in cache memory, more described length information is saved in memory, and specify in the shared space of valid data in each compression unit by the length information in cache memory.
According to a further aspect in the invention, proposed a kind of compressibility of video data, this system comprises:
Memory, storage is split into the video data of the elementary cell with unified size;
Input buffer, reads and cushions described elementary cell;
Compression set, the compression unit of preliminary dimension is compressed and obtained having to the elementary cell that input buffer is provided;
Write address calculator, for calculating described compression unit at the write address of memory;
Output buffer, receives the compression unit of compression set output, and according to the write address being calculated by described write address calculator, described compression unit is write in described memory.
Preferably, described compression set compresses with level pressure contracting comparison elementary cell, obtains having the compression unit of unified preliminary dimension.
Preferably, described compression set compresses elementary cell with Ratios.
Preferably, described compression set makes the size of the compression unit after compression identical with the basic-cell dimensions before compression, and the length information of the valid data in compression unit is provided; And this system also comprises: length information write address calculator, the write address of the length information that calculates the valid data in each compression unit in memory; And second output buffer, receive the length information of the valid data in the compression unit that described compression set provides, and the write address providing according to described length information write address calculator is by described length information write memory.
Preferably, cache memory, before in described length information is write to described memory, be first kept in cache memory, and specified in the shared space of valid data in each compression unit by the length information in cache memory.
According to a further aspect in the invention, proposed a kind of decompression method of video data, the method comprises:
1) compression unit in read memory, wherein said compression unit compresses and obtains elementary cell according to above-mentioned compression method;
2) the described compression unit reading being carried out to decompress(ion) contracts and obtains described elementary cell.
3) described elementary cell is saved in memory.
Preferably, described compression unit is to obtain by elementary cell being carried out to determine the compression of compression ratio; And in step 2) in, compression unit is carried out the decompression of corresponding certainty ratio and obtains elementary cell.
Preferably, described compression unit is to obtain by elementary cell being carried out to the compression of Ratios, and the size of compression unit is identical with the basic-cell dimensions before compression; And in step 1), read the length information of the valid data in compression unit and this compression unit; In step 2) in, according to described length information, the valid data in the described compression unit reading are decompressed, obtain elementary cell.
Preferably, in step 1), the described length information in memory is read in cache memory, and by cache memory, indicate the length information of the valid data in compression unit.
According to a further aspect in the invention, proposed a kind of decompression systems of video data, this system comprises:
Memory, for store compressed unit, wherein said compression unit compresses and obtains elementary cell according to above-mentioned compressibility;
Read address calculator, for calculating the address of reading of compression unit;
The first input buffer, reads and cushions described compression unit according to the described address of reading of reading address calculator and providing;
Decompressing device, the compression unit that described the first input buffer is provided carries out decompress(ion) and contracts and obtain described elementary cell;
Output buffer, receives and cushions the elementary cell of described decompressing device output, and output in described memory.
Preferably, described compression unit is to obtain by elementary cell being carried out to determine the compression of compression ratio; And described decompressing device carries out the decompression of corresponding certainty ratio and obtains elementary cell compression unit.
Preferably, described decompression systems also comprises: length information is read address calculator, and the length information that calculates the valid data in each compression unit is read address in described memory; And second input buffer, described length information is read and cushions in the address of reading of reading address calculator and provide according to described length information from described memory; And wherein said compression unit is to obtain by elementary cell being carried out to the compression method of Ratios, and the elementary cell before the size of described compression unit and compression is measure-alike; And described decompression unit decompresses to the valid data in described compression unit according to the length information of the valid data in described compression unit, obtain described elementary cell.
Preferably, described system also comprises: cache memory, the described length information of reading from described memory is kept in described cache memory, by the length information in described cache memory, indicates the shared space of valid data in each compression unit.
Accompanying drawing explanation
Fig. 1 has shown the flow chart of the compression method of video data according to an embodiment of the invention;
Fig. 2 has shown the structured flowchart of the compressibility of video data according to an embodiment of the invention;
Fig. 3 has shown the structured flowchart of the compressibility of video data according to another embodiment of the invention;
Fig. 4 has shown the flow chart of the decompression method of video data according to an embodiment of the invention;
Fig. 5 has shown the structured flowchart of the decompression systems of video data according to an embodiment of the invention;
Fig. 6 has shown the structured flowchart of the decompression systems of video data according to another embodiment of the invention;
Embodiment
Fig. 1 has shown the flow chart of the compression method of video data according to an embodiment of the invention, and in this embodiment, the method comprises:
S101, is divided into a plurality of elementary cells with unified size by the video data in memory;
S102, reads described elementary cell;
S103, compresses and obtains having the compression unit of preliminary dimension to the described elementary cell reading;
S104, is saved in described compression unit in memory.
Elementary cell is that this is the minimum access unit of the compression method in this embodiment.Therefore because elementary cell has unified size, can unify size according to the sequence number of elementary cell and this and easily determine that the elementary cell that reads reads address in memory.
Preferably, the write address of compression unit in memory can calculate by initial address and offset address, and wherein, because the size of compression unit is predetermined, so offset address can decide by the size of compression unit and the sequence number of compression unit.The space occupying in memory due to each elementary cell or compression unit is that can predict and fixing, the mapping relations that are each elementary cell or the compression unit address in memory are fixed, and between each elementary cell or compression unit, be separate, therefore can realize reading at random each elementary cell or compression unit.
Preferably, the preliminary dimension of the compression unit that all elementary cells obtain after overcompression all equates, that is to say, all compression units that obtain occupy the storage space of formed objects, and this preliminary dimension is less than or equal to the unified size of elementary cell.
Yet the preliminary dimension of each compression unit also can be unequal, in this case, can calculate the address of each compression unit in memory by extra address information, still can realize the object that reduces memory space and access bandwidth.
In a distortion, in step S103, can the compression method based on determining compression ratio be compressed by elementary cell, to all elementary cells, adopt fixing compression factor to compress, 2:1 for example, 4:1 etc., compression factor can be selected arbitrarily as required.The advantage of this scheme is, it is little that the storage space size that compression unit is used is used than elementary cell, thereby realized the object that reduces access space and access bandwidth.And the storage space size that compression unit is used is predictable, and is unified and fixing, and the mapping relations of corresponding storage address are fixed, therefore without preserving extra information for address computation.
In another distortion, in step S103, can the compression method based on Ratios be compressed by elementary cell, each elementary cell is adopted to unfixed compression ratio, can determine as required the compression ratio of each elementary cell, for example can determine adaptively according to the analysis to elementary cell, also can specify according to the data characteristics of basic compression unit, preferably, if the data in certain elementary cell still can recovered enough information after vast scale compression after decompression, for this elementary cell is specified larger compression factor, if certain elementary cell only could be recovered afterwards enough information in decompression in the situation that small scale is compressed, for this elementary cell is specified less compression factor.The advantage of the scheme of this Ratios is flexibly and targetedly, can improve to greatest extent according to actual needs overall compression efficiency.
The size that adopts Ratios to compress the compression unit obtaining can be skimble-scamble, may need in this case extra information for address computation.In a preferred embodiment, when the compression method of employing based on Ratios compresses elementary cell, can make the size of the compression unit after compression identical with the basic-cell dimensions before compression, and record the length information of valid data in each compression unit.Wherein, the size of compression unit is the size in the space that occupies in memory of compression unit, and valid data are packed datas actual in compression unit, the packed data of the varying length that elementary cell obtains after the compression of Ratios.Preferably, the length information of the valid data in each compression unit for example, can be kept in previously selected storage space according to particular order (order of compression unit).More preferably, in length information is saved in to memory before, can first length information be kept in cache memory (cache), to improve access efficiency.That is to say, each compression unit in memory, still occupy with compression before the onesize space of elementary cell, the space that valid data in each compression unit occupy is indicated by the length information of preserving on cache memory or memory specific region, so the method for this embodiment has the compression ratio of flexibility and changeability and the advantage of simple fixing two aspects, access address concurrently.
Preferably, can adopt compression algorithm arbitrarily to compress elementary cell, such as traditional transform and quantization method based on block of video data, the various destructive data compressing method etc. that undermines, as long as it can realize the compression of determining compression ratio or Ratios.
Preferably, can need to select the unified size of described elementary cell according to practical application.Preferably, each elementary cell can be comprised of at least one data block, and can according to practical application need to select at least one data block that each elementary cell comprises quantity, size, put in order and data content etc.For instance, for meeting the H.264 video data of standard, it is 4 * 4 data matrixes that its conventional video data is processed minimum unit, therefore can 4 * 4 data matrixes as data block, can 8 * 8 data matrixes for meeting the video data of Joint Photographic Experts Group as data block.Each elementary cell can be comprised of the data block of any amount, and the data block in each elementary cell can have identical size or different sizes.
Fig. 2 has described the structured flowchart of the compressibility of video data according to an embodiment of the invention, and in this embodiment, this system comprises:
Compression set 203, the compression unit of preliminary dimension is compressed and obtained having to the elementary cell that input buffering 202 devices are provided;
Write address calculator 204, for calculating each compression unit at the write address of memory;
The first output buffer 205, receives the compression unit of compression set 203 outputs, and according to the write address being calculated by described write address calculator 204, described compression unit is write in described memory 201.
Preferably, write address calculator 204 can calculate the write address of compression unit in memory by initial address and offset address, wherein, because the size of compression unit is precognition and fixing, so offset address can decide by the size of compression unit and the sequence number of compression unit.
The preliminary dimension of the compression unit that preferably, all elementary cells obtain after overcompression all equates.
In a distortion, compression set 203 can compress elementary cell by the compression method based on determining compression ratio, to all elementary cells, adopts fixing compression factor to compress, 2:1 for example, and 4:1 etc., compression factor can be selected arbitrarily as required.
In another distortion, compression set 203 can compress elementary cell by the compression method based on Ratios, each elementary cell is adopted to unfixed compression ratio, can select according to actual needs the compression ratio of each elementary cell.
Preferably, when the compression method of employing based on Ratios compresses elementary cell, described compression set makes the size of the compression unit after compression identical with the basic-cell dimensions before compression, and the length information of valid data in compression unit is provided.Preferably, the length information of the valid data in each compression unit for example, can be kept in previously selected storage space according to particular order (order of compression unit).More preferably, length information can be kept in cache memory (cache), to improve access efficiency, that is to say, each compression unit in memory, still occupy with compression before the onesize space of elementary cell, but the length information that preserve in cache memory or memory in the space that valid data wherein occupy is specified.Fig. 3 has described the structured flowchart of compressibility of the video data of above-mentioned preferred embodiment.
On the basis of the system of the embodiment shown in Fig. 3 system in the embodiment shown in Figure 2, also comprise length information write address calculator 206, this length information write address calculator is the write address in memory 201 for the length information of valid data that calculates each compression unit, that is to say, the write address of compression unit in memory 201 provided by write address calculator 204, and the write address in memory 201 of the length information of the valid data in compression unit is provided by length information write address calculator 206.Preferably, length information write address calculator 206 can carry out the write address of computational length information according to the initial address of length information and offset address, wherein the offset address of length information can calculate by the length of valid data in compression unit and the sequence number of compression unit.System in embodiment shown in Fig. 3 also comprises the second output buffer 208, for the length information cushioning and output squeezing device 203 provides.Wherein this second output buffer 208 receives the length information that compression set 203 provides, and the write address providing according to length information write address calculator is by described length information write memory 201.
In a distortion, length information can be kept in the appointed area of memory 201 to reading and decompressing for compression unit.
In another distortion, system shown in Fig. 3 also can comprise cache memory (CACH) 207, before length information is saved in memory 201, first be kept in cache memory 207, by the length information in cache memory 207, specify in the shared space of valid data in each compression unit, thereby improve the access efficiency to the compression unit in memory 201.
Preferably, can adopt compression algorithm arbitrarily to compress elementary cell, such as traditional transform and quantization method based on block of video data, the various destructive data compressing method etc. that undermines, as long as it can realize the compression of determining compression ratio or Ratios.
Utilize the compression method of above embodiment first to carry out compressed encoding to the elementary cell of the original video data from memory and obtain compression unit write memory again, can realize simple addressing and the arbitrary access of elementary cell and compression unit, effectively reduce the space that video data takies in memory simultaneously.When needs are done further operation or process video data, from memory, read randomly as required the video data (compression unit) of required compression and be transferred to object module, decode again and obtain original video data (elementary cell), thereby effectively reduce the bandwidth of for example, between inner each module of ASIC (memory, display module) transmission of data.
The invention still further relates to decompression method and the system corresponding with compression method above and system.
Fig. 4 has shown the flow chart of the decompression method of video data according to an embodiment of the invention, and in this embodiment, the method comprises:
S401, the compression unit in read memory, wherein said compression unit is by the method shown in Fig. 1, elementary cell to be compressed and obtained;
S402, carries out decompress(ion) to the described compression unit reading and contracts and obtain described elementary cell.
S403, is saved in described elementary cell in memory.
Preferably, compression unit reading address and can calculate by initial address and offset address in memory, from the description to compression method above, the size of compression unit is predetermined, therefore offset address can decide by the size of compression unit and the sequence number of compression unit, because elementary cell all has unified size, therefore can unify the easily write address of definite elementary cell reading in memory of size according to the sequence number of elementary cell and this.
Preferably, the size of all compression units all equates.
In a distortion, compression unit is to obtain by elementary cell being carried out to determine the compression of compression ratio, can carry out the decompression of corresponding certainty ratio and obtain elementary cell compression unit.
In another distortion, compression unit is to obtain by elementary cell being carried out to the compression method of Ratios, preferably, the size of compression unit is identical with the basic-cell dimensions before compression, and in memory, recorded the length information of valid data in each compression unit, therefore, in step S401, can read the length information of compression unit and valid data thereof, and according to the length information of valid data, the valid data in the compression unit reading are decompressed, obtain elementary cell.
Preferably, the length information in memory can be read in cache memory, and by cache memory, indicate the length information of the valid data in compression unit, further to improve access efficiency.
Fig. 5 has described the structured flowchart of the decompression systems of video data according to an embodiment of the invention, and in this embodiment, this system comprises:
Read address calculator 502, for calculating the address of reading of compression unit;
The first input buffer 503, address, reads and cushions described compression unit according to described reading of reading that address calculator 502 provides;
Preferably, read address calculator 502 and can calculate the address of compression unit in memory by initial address and offset address, wherein, because the size of compression unit is precognition and fixing, so offset address can decide by the size of compression unit and the sequence number of compression unit.
Preferably, the size of all compression units all equates.
In a distortion, compression unit is to obtain by elementary cell being carried out to determine the compression of compression ratio, and decompressing device 504 can carry out the decompression of corresponding certainty ratio and obtain elementary cell compression unit.
In another distortion, compression unit is to obtain by elementary cell being carried out to the compression method of Ratios, preferably, the size of compression unit is identical with the basic-cell dimensions before compression, and in memory 501, recorded the length information of valid data in each compression unit, therefore, can read the length information of compression unit and valid data thereof, and according to the length information of valid data, the valid data in the compression unit reading are decompressed, obtain elementary cell.
On the basis of the system of the embodiment shown in Fig. 6 system in the embodiment shown in fig. 5, also comprise that length information reads address calculator 506, this length information is read address calculator 506 and in memory 501, is read address for the length information of valid data that calculates each compression unit, that is to say, the read address of compression unit in memory provides by reading address calculator 502, and the address of reading in memory 501 of the valid data length information in compression unit is read address calculator 506 by length information and provided.Preferably, length information is read address calculator 506 can come the address of reading of computational length information according to the initial address of length information and offset address, wherein the offset address of length information can calculate by the length of valid data in compression unit and the sequence number of compression unit.Embodiment shown in Fig. 6 also comprises the second input buffer 508, and the length information of the valid data in described compression unit is read and cushion in the address of reading that this second input buffer 508 is read address calculator 506 and provided according to described length information from described memory 501.Decompression unit 504 decompresses to the valid data in described compression unit according to the length information of the valid data in described compression unit, obtains described elementary cell.
In a distortion, length information can be kept in the appointed area of memory 501 to reading and decompressing for compression unit.
In another distortion, system shown in Fig. 6 also can comprise cache memory 507(CACH), the length information of reading from memory 501 is kept in cache memory 507, by the length information in cache memory, indicate the shared space of valid data in each compression unit, thereby improve the access efficiency to the compression unit in memory.
In the compressing/decompressing method of video data of the present invention and an exemplary application of system, the decoded original video data obtaining in Video Decoder can be divided into elementary cell, and carry out above-mentioned compression and obtain corresponding compression unit, and be kept in memory, to save storage space, and when this video data of needs, read at random as required required compression unit and decompress, revert to original video data and be used, thereby having saved bandwidth resources in sheet.
Above-described embodiment is for illustrative principle of the present invention and effect thereof, but not for limiting the present invention.Any person skilled in the art all can, under spirit of the present invention and category, modify to above-described embodiment.So protection scope of the present invention, should be as listed in claims of the present invention.
Claims (18)
1. a compression method for video data, the method comprises:
1) video data in memory is divided into a plurality of elementary cells with unified size;
2) read described elementary cell;
3) the described elementary cell reading is compressed and is obtained having the compression unit of preliminary dimension;
4) described compression unit is saved in memory.
2. the compression method of video data according to claim 1, wherein
In step 3), with level pressure contracting comparison elementary cell, compress, obtain having the compression unit of unified preliminary dimension.
3. the compression method of video data according to claim 1, wherein
In step 3), with Ratios, elementary cell is compressed.
4. the compression method of video data according to claim 3, wherein
In step 3), described elementary cell measure-alike before the size that makes the described compression unit after compression and compression, and record the length information of the valid data in each compression unit; And
In step 4), the length information of the valid data in each compression unit is saved in previously selected storage space.
5. the compression method of video data according to claim 4, wherein
In step 4), first described length information is kept in cache memory, more described length information is saved in memory, and specify in the shared space of valid data in each compression unit by the length information in cache memory.
6. a compressibility for video data, this system comprises:
Memory, storage is split into the video data of the elementary cell with unified size;
Input buffer, reads and cushions described elementary cell;
Compression set, the compression unit of preliminary dimension is compressed and obtained having to the elementary cell that input buffer is provided;
Write address calculator, for calculating described compression unit at the write address of memory;
Output buffer, receives the compression unit of compression set output, and according to the write address being calculated by described write address calculator, described compression unit is write in described memory.
7. the compressibility of video data according to claim 6, wherein
Described compression set compresses with level pressure contracting comparison elementary cell, obtains having the compression unit of unified preliminary dimension.
8. the compressibility of video data according to claim 6, wherein
Described compression set compresses elementary cell with Ratios.
9. the compressibility of video data according to claim 8, wherein
Described compression set makes the size of the compression unit after compression identical with the basic-cell dimensions before compression, and the length information of the valid data in compression unit is provided; And
This system also comprises:
Length information write address calculator, the write address of the length information that calculates the valid data in each compression unit in memory; And
The second output buffer, receive the length information of the valid data in the compression unit that described compression set provides, and the write address providing according to described length information write address calculator is by described length information write memory.
10. the compressibility of video data according to claim 9, wherein this system also comprises:
Cache memory, in described length information is write to described memory before, be first kept in cache memory, and specified in the shared space of valid data in each compression unit by the length information in cache memory.
The decompression method of 11. 1 kinds of video datas, the method comprises:
1) compression unit in read memory, wherein said compression unit is according to the method described in any one in claim 1-5, elementary cell to be compressed and obtained;
2) the described compression unit reading being carried out to decompress(ion) contracts and obtains described elementary cell;
3) described elementary cell is saved in memory.
The decompression method of 12. video datas according to claim 11, wherein
Described compression unit is to obtain by elementary cell being carried out to determine the compression of compression ratio; And
In step 2) in, compression unit is carried out the decompression of corresponding certainty ratio and obtains elementary cell.
The decompression method of 13. video datas according to claim 11, wherein
Described compression unit is to obtain by elementary cell being carried out to the compression of Ratios, and the size of compression unit is identical with the basic-cell dimensions before compression; And
In step 1), read the length information of the valid data in compression unit and this compression unit;
In step 2) in, according to described length information, the valid data in the described compression unit reading are decompressed, obtain elementary cell.
The decompression method of 14. video datas according to claim 13, wherein
In step 1), the described length information in memory is read in cache memory, and by cache memory, indicate the length information of the valid data in compression unit.
The decompression systems of 15. 1 kinds of video datas, this system comprises:
Memory, for store compressed unit, wherein said compression unit is according to the system of any one in claim 6 to 10, elementary cell to be compressed and obtained;
Read address calculator, for calculating the address of reading of compression unit;
The first input buffer, reads and cushions described compression unit according to the described address of reading of reading address calculator and providing;
Decompressing device, the compression unit that described the first input buffer is provided carries out decompress(ion) and contracts and obtain described elementary cell;
Output buffer, receives and cushions the elementary cell of described decompressing device output, and output in described memory.
The decompression systems of 16. video datas according to claim 15, wherein
Described compression unit is to obtain by elementary cell being carried out to determine the compression of compression ratio; And
Described decompressing device carries out the decompression of corresponding certainty ratio and obtains elementary cell compression unit.
The decompression systems of 17. video datas according to claim 15, wherein
Described decompression systems also comprises:
Length information is read address calculator, and the length information that calculates the valid data in each compression unit is read address in described memory; And
The second input buffer, described length information is read and cushions in the address of reading of reading address calculator and provide according to described length information from described memory; And wherein
Described compression unit is to obtain by elementary cell being carried out to the compression method of Ratios, and the elementary cell before the size of described compression unit and compression is measure-alike; And
Described decompression unit decompresses to the valid data in described compression unit according to the length information of the valid data in described compression unit, obtains described elementary cell.
The decompression systems of 18. video datas according to claim 17, wherein
Described system also comprises:
Cache memory, is kept at the described length information of reading from described memory in described cache memory, by the length information in described cache memory, indicates the shared space of valid data in each compression unit.
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| CN108171662A (en) * | 2017-12-18 | 2018-06-15 | 珠海全志科技股份有限公司 | Read the method for image compression data and the anti-distortion method comprising this method |
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Application publication date: 20140212 |