CN101500160B - Code stream identification method, apparatus and encoding, decoding system - Google Patents
Code stream identification method, apparatus and encoding, decoding system Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
- H04N19/10—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding
- H04N19/102—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the element, parameter or selection affected or controlled by the adaptive coding
- H04N19/12—Selection from among a plurality of transforms or standards, e.g. selection between discrete cosine transform [DCT] and sub-band transform or selection between H.263 and H.264
- H04N19/122—Selection of transform size, e.g. 8x8 or 2x4x8 DCT; Selection of sub-band transforms of varying structure or type
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
- H04N19/10—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding
- H04N19/169—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the coding unit, i.e. the structural portion or semantic portion of the video signal being the object or the subject of the adaptive coding
- H04N19/17—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the coding unit, i.e. the structural portion or semantic portion of the video signal being the object or the subject of the adaptive coding the unit being an image region, e.g. an object
- H04N19/176—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the coding unit, i.e. the structural portion or semantic portion of the video signal being the object or the subject of the adaptive coding the unit being an image region, e.g. an object the region being a block, e.g. a macroblock
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
- H04N19/46—Embedding additional information in the video signal during the compression process
Abstract
The invention provides an identifying method and an identifying device and an encoding and decoding system. The method mainly comprises the following steps: at an encoding terminal, according to an encoding template of an image block and transformation modes used by the image block, an image block transformation mode identification corresponding to the image block is set and written into an encoding code stream; after the code stream is received at a decoding terminal, the encoding template of the image block is obtained from the code stream, and according to the encoding template of the image block, the image block transformation mode identification corresponding to the image block is obtained; and decoding operation of the corresponding image block is carries out according to the image block transformation mode identification. As the embodiment of the invention is realized, the transformation mode adopted by each image block can be accurately identified in the encoding code stream, furthermore, according to the encoding data information of the image block, the way of writing the transformation mode identification is determined, thus ensuring that the transformation mode corresponding each image block can be accurately obtained at the decoding terminal, as well as improving the encoding and decoding performance.
Description
Technical field
The present invention relates to image encoding and decoding technique field, particularly relate to a kind of code stream identification method, device and coding/decoding system.
Background technology
In video and image coding and decoding process, for reducing video and the data volume of view data when transmitting or store, usually need to adopt corresponding compression coding and decoding technology.Need to adopt converter technique that the picture material in one sub-picture, a region and information are concentrated on a certain specific region, effectively to compress corresponding contents at video compression algorithm after conversion in video and image compression encoding process.Specifically the Region dividing of in piece image or image can be become some fritters or subregion (be called sub-block, also can be referred to as image block), convert in units of sub-block more afterwards.Wherein, the size of sub-block can be, but not limited to be 4 × 4 or 8 × 8 etc., and corresponding 4 and 8 all in units of image pixel.Image block usually with 16 × 16 in video and image encoding/decoding is an encoding and decoding processing unit, and this unit is called macro block.A macro block may become the sub-block that some sizes are less by Further Division in addition, and sub-block and macro block all can be referred to as image block.
Carrying out in partition process, specifically a specific region can be divided according to different sub-block sizes respectively, the sub-block then for different size carries out different conversion process, is called the converter technique of adaptive block size.Conversion mentioned here refers to the data processing method with certain mathematical characteristic, such as DCT (discrete cosine transform), wavelet transformation, integer transform etc.In video and image encoding/decoding, these conversion represent usually in the matrix form.
When there is multiple pattern conversion in adaptive block sizes converter technique, partial macroblock can be used alone a kind of pattern conversion, described pattern conversion refers to conversion and converts corresponding encoding and decoding processing mode, such as, a size is that in the macro block of 16 × 16, all sub-blocks are all divided into 8 × 8 sizes, and all sub-blocks all adopt the conversion of 8 × 8 and to the corresponding coding of conversion and decoding technique (namely adopting a kind of pattern conversion).Simultaneously, sub-block in partial macroblock can use different pattern conversions, such as: if containing 4 × 4,4 × 8,8 × 4 and 8 × 8 several sub-block type in the macro block of 16 × 16, then 4 × 4,4 × 8,8 × 4 and 8 × 8 each self-corresponding pattern conversions can be used respectively.For this reason, the pattern conversion that corresponding flag bit uses for identifying macro block and sub-block is needed to set in code stream.
The mode of the pattern conversion that the mark macro block of current employing uses is: can add a bit flag position for representing that current macro uses 8 × 8 pieces of corresponding pattern conversions or 4 × 4 pieces of corresponding pattern conversions in MB header.
Realizing in process of the present invention, inventor finds that in prior art, at least there are the following problems:
Due to the sub-block being applicable to different conversion may be there is in (as macro block) in an Image Coding base unit, different sub-blocks will adopt different pattern conversions, if only use the encoding characteristics of a whole coding base unit of flag bit unifying identifier, then will reduce the flexibility of adaptive block sizes conversion, and then reduce corresponding coding efficiency.
Summary of the invention
Embodiments provide a kind of code stream identification method and device, a kind of coding/decoding method and device and a kind of coding/decoding system, can accurate identification go out each image block adopt sub-block pattern conversion, thus ensure the flexibility of adaptive block sizes conversion, improve coding efficiency.
A kind of code stream identification method, comprising:
According to the pattern conversion that image block coding templet and image block use, image block pattern conversion mark corresponding to described image block is set;
By in described image block pattern conversion mark write encoding code stream.
A kind of code stream identification device, comprising:
First mark acquiring unit, the image block pattern conversion mark that the described image block for obtaining the pattern conversion setting used according to image block coding templet and image block is corresponding;
First write code stream unit, writes in encoding code stream for the image block pattern conversion mark obtained by described first mark acquiring unit.
A kind of coding/decoding method, comprising:
Received code code stream, obtains the image block coding templet in code stream, obtains image block pattern conversion mark corresponding to image block according to this image block coding templet;
According to described image block pattern conversion mark, decode operation is carried out to corresponding image block.
A kind of decoding device, comprising:
First pattern conversion acquiring unit, for obtaining image block coding templet from the encoding code stream received, and obtains image block pattern conversion mark corresponding to image block according to this image block coding templet;
First decoding unit, carries out decode operation for the image block pattern conversion mark obtained according to described first pattern conversion acquiring unit to corresponding image block.
A kind of coding/decoding system, comprise encoding apparatus and decoding apparatus, described code device comprises code stream identification device, and described code stream identification device comprises:
First mark acquiring unit, the image block pattern conversion mark that the described image block for obtaining the pattern conversion setting used according to image block coding templet and image block is corresponding; And
First write code stream unit, writes in encoding code stream for the image block pattern conversion mark obtained by described first mark acquiring unit.
Described decoding device comprises:
First pattern conversion acquiring unit, for obtaining image block coding templet from the encoding code stream received, and obtains image block pattern conversion mark corresponding to image block according to image block coding templet; And
First decoding unit, carries out decode operation for the image block pattern conversion mark obtained according to described first pattern conversion acquiring unit to corresponding image block.
The technical scheme provided as can be seen from the embodiment of the invention described above, the realization of the embodiment of the present invention makes the pattern conversion that can identify the employing of each image block in encoding code stream exactly, and the mode of write image block pattern conversion mark is determined according to the encoded digital information of image block, thus ensure that can pattern conversion corresponding to each image block of Obtaining Accurate in decoding end, and encoding and decoding performance can be improved.
Accompanying drawing explanation
The code stream identification method that Fig. 1 provides for the embodiment of the present invention and corresponding coding/decoding method schematic diagram;
The structural representation one of the identity device that Fig. 2 provides for the embodiment of the present invention;
The structural representation one of the decoding device that Fig. 3 provides for the embodiment of the present invention;
The structural representation two of the identity device that Fig. 4 provides for the embodiment of the present invention;
The structural representation two of the decoding device that Fig. 5 provides for the embodiment of the present invention.
Embodiment
In the embodiment of the present invention, be respectively pattern conversion that each image block adopts and whether there is image block pattern conversion mark corresponding to the traffic sign placement of coded data for identification image block, to make it possible to accurately to identify pattern conversion that each image block adopts and to reduce the overhead bit brought because writing mark, thus improve encoding and decoding performance.
In the standard of coding and decoding video, whether existence one exists the mark of coded data for identification image block usually, is referred to as image block coding templet (cbp or MbCBP).In non-skip macroblock (skip macroblock i.e. this macro block does not carry out Code And Decode process, and its coding or decoded data are obtained from other image block by certain mode), a macro block contains an image block coding templet.
Under normal circumstances, in the image of sampling with 4:2:0, image block coding templet is one 6 bit numbers, and the luminance component of a macro block is divided into the sub-block of 48 × 8 sizes, and chromatic component is divided into the sub-block of 28 × 8 sizes.4 bits (such as image block coding templet low four) in the image block coding templet of 6 bits are for representing that whether four luminance block are containing coded data, if there is coded data, that bit value corresponding with luminance block is set to ' 1 ', otherwise is set to ' 0 '; 2 bits (such as image block coding templet high 2) in the image block coding templet of 6 bits are for representing that whether two chrominance block are containing coded data, if there is coded data, that bit value corresponding with luminance block is set to ' 1 ', otherwise is set to ' 0 '.
With 4:2:2 coding image in, image block coding templet is one 8 bit numbers, now in image block coding templet the setting of bit value sample with 4:2:0 under image block coding templet setting principle identical.
Particularly, as shown in Figure 1, the process of the pattern conversion that corresponding identification image block adopts specifically can comprise: at coding side, can according to the pattern conversion of image block coding templet and image block, the pattern conversion used for image block arranges corresponding image block pattern conversion mark, and the image block pattern conversion mark described in determining is the need of in write encoding code stream, so that identify the pattern conversion of each image block employing in encoding code stream.Corresponding, after decoding end received code code stream, just can obtain image block coding templet from code stream, and determine the obtain manner of the image block pattern conversion mark that in macro block, each image block is corresponding, to carry out decode operation according to the image block pattern conversion mark obtained to corresponding image block.
In the embodiment of the present invention, after the image block pattern conversion mark that each image block corresponding is corresponding specifically can write on the image block coding templet in MB header, like this, just from the MB header code stream, image block pattern conversion mark corresponding to each image block can be obtained in relevant position in decoding end.
Be described further below in conjunction with the realization of embody rule example to the embodiment of the present invention.
In video encoding and decoding standard, for macro block, corresponding image block coding templet is macroblock coding template and is usually present in MB header.In embodiments of the present invention, specifically the image block pattern conversion mark being used for the pattern conversion that identification image block uses can be combined with the mark (namely whether there is coded data for identifying sub-block in each macro block) being used for identifying macro block subblock coding data in macroblock coding template, namely carrying out the setting of image block pattern conversion mark for the mark pattern conversion that specifically each sub-block (i.e. image block) uses according to the mark of mark macro block subblock coding data.
For example, the mark of corresponding macroblock coding template can be the numerical value of one 6 bits, wherein:
(1) low 4 data that whether there is Image Coding for 48 × 8 sub-blocks identifying 16 × 16 macro blocks of the mark of macroblock coding template, described image coded data refers to the residual error of image block after prediction, transform and quantization; If certain sub-block does not exist image coded data, then the value of its flag bit corresponding in macroblock coding template is set to 0, otherwise, be set to 1;
(2) high 2 of mark of macroblock coding template are the indicating bit of chrominance block coded message.
In the embodiment of the present invention can be arranged on macroblock coding template for the mark (i.e. image block pattern conversion mark) identifying sub-block pattern conversion after.When mark place value corresponding in macroblock coding template low 4 of sub-block is 0, then because this sub-block is not containing any coded data, therefore corresponding image block pattern conversion mark is not set for this sub-block; When mark place value corresponding in macroblock coding template low 4 of sub-block is 1, then corresponding image block pattern conversion mark is set for this sub-block.Such as, if low four bit-identifies of macroblock coding template are m3m2m1m0, wherein m0, m1, m2 and m3 is respectively the bit of in macroblock coding template the 0th to the 3rd, if the numerical value that m0, m1, m2 and m3 are corresponding is ' 0 ', ' 1 ', ' 1 ' and ' 0 ', then to know in macroblock coding template that first and second contain coded data (the 0th a pair the 3rd not containing coded data), the image block pattern conversion mark of this sub-block corresponding to two needs in write encoding code stream.Suppose t0, t1, t2 and t3 are respectively the 0th, and 1,2, the image block pattern conversion mark corresponding to 3 luminance block, then the value of t1 and t2 needs in write encoding code stream; If the value of t1 and t2 is respectively ' 1 ' and ' 0 ', if then write in code stream in t2t1 mode, then corresponding bit stream ' 01 ' can be write, if write in code stream in t1t2 mode, then corresponding bit stream ' 10 ' can be write.
It should be noted that, when corresponding image block pattern conversion is designated 1, may be used for representing that this sub-block employs 8 × 8 pattern conversions, namely this sub-block can carry out predicting, uses 8 × 8 conversion and based on the quantification of 8 × 8 sizes, scanning and entropy code by 8 × 8 block sizes; When corresponding image block pattern conversion is designated 0, then can represent that this sub-block employs 4 × 4 pattern conversions, namely this sub-block can carry out predicting, uses 4 × 4 conversion and based on the quantification of 4 × 4 sizes, scanning and entropy code by 4 × 4 block sizes.This value implication is only applicating example, also can adopt the implication of other values in the process realizing the embodiment of the present invention, with the pattern conversion indicating corresponding sub-block to adopt.Such as, the size of corresponding sub-block can also be 8 × 4,4 × 8,8 × 16,16 × 8 or 16 × 16 etc. and correspond to different pattern conversions respectively, now, the arranging of each value of corresponding image block pattern conversion mark needs to distinguish the different pattern conversion of instruction.
That is, in this application example, the macroblock size corresponding to the mark of macroblock coding template can be n × m, and wherein n and m is positive integer; Two or more pattern conversion can be comprised in a macro block.Number for the pattern conversion that can comprise in an image block (i.e. macro block) is identified by the image block pattern conversion arranged after macroblock coding template to determine.
Corresponding with this application example, in decoding end, then after receiving code stream, just can in corresponding MB header macroblock coding template decoding after determine each sub-block corresponding image block pattern conversion mark obtain manner.When in macroblock coding template, a bit place value is ' 1 ', show in the sub-block corresponding to this bit containing coded data, from the bit stream representing sub-block pattern conversion, then read image block pattern conversion mark corresponding to this bit, and the pattern conversion utilizing this image block pattern conversion to identify correspondence carries out decoding process to this sub-block.Such as, low four bit-identifies of the macroblock coding template obtained if decode from encoding code stream are m3m2m1m0, wherein m0, m1, m2 and m3 is respectively the bit of in macroblock coding template the 0th to the 3rd, if the numerical value that m0, m1, m2 and m3 are corresponding is ' 0 ', ' 1 ', ' 1 ' and ' 0 ', then in known macroblock coding template, first and second contain coded data, and the image block pattern conversion mark of this sub-block corresponding to two needs to obtain from encoding code stream.If t0, t1, t2 and t3 are respectively the 0th, 1,2, the image block pattern conversion mark corresponding to 3 luminance block, then the value of t1 and t2 needs to obtain from encoding code stream.From encoding code stream, decoding obtains pattern conversion bit stream is ' 01 ', then the value that can obtain t1 and t2 is respectively ' 1 ' and ' 0 ', and therefore the 1st and the 2nd luminance block uses the pattern conversion of ' 1 ' and ' 0 ' correspondence to carry out decoding process respectively.Because the 0th and the 3rd luminance block be not containing coded data, therefore it does not need to use conversion to carry out decoding process, without the need to obtaining corresponding image block pattern conversion mark yet.
The embodiment of the present invention additionally provides a kind of code stream identification device, and its specific implementation structure as shown in Figure 2, can comprise with lower unit:
(1) first mark acquiring unit, the image block pattern conversion mark that the described image block for obtaining the pattern conversion setting used according to the mark and image block that whether there is coded data for identification image block is corresponding; This first mark acquiring unit specifically can comprise:
First judging unit, is used for judging that the mark that whether there is coded data for identification image block indicates this image block whether to comprise coded data;
First mark determining unit, during for determining that at described first judging unit this image block of described mark instruction comprises coded data, determines the image block pattern conversion mark that this image block of setting is corresponding.
Alternatively, described image block pattern conversion mark specifically can be arranged in encoding code stream and be used for after whether identification image block exist the mark of coded data by this first write code stream unit.
(2) first write code stream unit, in the image block pattern conversion mark write encoding code stream that obtained by described first mark acquiring unit, so that receiving terminal can the pattern conversion that adopts of the corresponding image block of Obtaining Accurate.
In said apparatus, corresponding coded data can be: the data produced in the residual error data after prediction in macro block, the residual error data after prediction, data, motion vector difference or the video coding process after transform and quantization.
In said apparatus, corresponding pattern conversion can be: the conversion of different change of scale; Or, dissimilar conversion; Or, the combination of different change of scale and different alternative types; Or, combination one or more in the conversion of different change of scale and the quantification of answering with transfer pair, scanning and entropy code; Or, combination one or more in dissimilar conversion and the quantification of answering with transfer pair, scanning and entropy code; Or combination one or more in the conversion of different change of scale and the quantification of answering with transfer pair, scanning and entropy code is with, and combination one or more in dissimilar conversion and the quantification of answering with transfer pair, scanning and entropy code; Corresponding change of scale can be then: 16 × 16,16 × 8,8 × 16,8 × 8,8 × 4,4 × 8 or 4 × 4 and other any length and width combinations; Described alternative types can be: parameter in transformation matrix is different or have the conversion of different mathematical feature.
The embodiment of the present invention additionally provides a kind of decoding device, and its specific implementation structure as shown in Figure 3, mainly can comprise with lower unit:
(1) first pattern conversion acquiring unit, for obtaining the mark that whether there is coded data for identification image block from the encoding code stream received, and obtains image block pattern conversion mark corresponding to image block according to this mark;
Alternatively, this first pattern conversion acquiring unit specifically can comprise:
Second judging unit, for judging whether whether there is indicating image block in the mark of coded data for identification image block comprises coded data;
First pattern conversion reading unit, whether exist after indicating image block comprises coded data in the mark of coded data for determining identification image block at described first judging unit, from encoding code stream, read the image block pattern conversion mark that this image block is corresponding.
(2) first decoding units, carry out decode operation for the image block pattern conversion mark obtained according to described first pattern conversion acquiring unit to corresponding image block;
Alternatively, this decoding unit specifically can comprise conversion process unit, for get image block pattern conversion mark corresponding to image block at described first pattern conversion acquiring unit after, the pattern conversion corresponding to this image block pattern conversion mark is used to carry out conversion process to coded data in this image block.
Above embodiment range of application can also further expand to the Code And Decode of chrominance block pattern conversion, and principle is with the coding and decoding of luminance block pattern conversion.
In the embodiment of the present invention, consider and can also arrange accordingly for the image block prediction indication of identification image block prediction characteristic in encoding-decoding process, then corresponding image block pattern conversion mark set-up mode can also adopt following scheme to realize:
According to whether there is the pattern conversion that the mark (i.e. image block coding templet) of coded data, image block prediction indication and image block use for identification image block, image block pattern conversion mark corresponding to described image block is set, and by described image block pattern conversion mark write encoding code stream; Wherein, corresponding image block prediction indication is used for identification image block prediction characteristic, and as can for size when image block is predicted, and this prediction characteristic can also comprise the predictive mode of image block employing, as the combination of infra-frame prediction or inter prediction or two kinds of situations.
Wherein, the process arranging image block pattern conversion mark corresponding to described image block can comprise: if indicate an image block to comprise coded data in the mark that whether there is coded data for identification image block, then image block pattern conversion mark corresponding to this image block is set according to image block prediction indication, particularly can for when uniquely can determine the pattern conversion that this image block adopts according to corresponding image block prediction indication, then without the need to arranging image block pattern conversion mark corresponding to this image block, namely now also still can ensure that receiving terminal can know the pattern conversion that this image block adopts without the need to arranging corresponding image block pattern conversion mark, then can omit this image block pattern conversion mark, to save overhead bit, if uniquely cannot determine according to corresponding image block prediction indication the pattern conversion that this image block adopts, then need in code stream, arrange image block pattern conversion mark corresponding to this image block.Adopt this technical scheme to make only just to carry out in corresponding encoding code stream when needed the setting of corresponding image block pattern conversion mark, therefore effectively can save the overhead bit in code stream.
In above-mentioned processing procedure, the prediction of respective image block can be infra-frame prediction or inter prediction.The prediction characteristic of image block wherein then can refer to that corresponding to image block prediction indication one or one group of tile size are 4 × 4,4 × 8,8 × 4,8 × 8,8 × 16,16 × 8,16 × 16 or other any length and width combinations.And can also determine according to the size of image block prediction indication corresponding image block the pattern conversion that this image block adopts.
In this embodiment, after corresponding image block pattern conversion mark specifically can be arranged at the mark and image block prediction indication that whether there is coded data for identification image block.
In this embodiment, corresponding coded data can be: the data produced in the residual error data after prediction in macro block, the residual error data after prediction, data, motion vector difference or the video coding process after transform and quantization.
Corresponding pattern conversion can be: the conversion of different change of scale; Or, dissimilar conversion; Or, the combination of different change of scale and different alternative types; Or, combination one or more in the conversion of different change of scale and the quantification of answering with transfer pair, scanning and entropy code; Or, combination one or more in dissimilar conversion and the quantification of answering with transfer pair, scanning and entropy code; Or, combination one or more in the conversion of different change of scale and the quantification of answering with transfer pair, scanning and entropy code, and combination one or more in dissimilar conversion and the quantification of answering with transfer pair, scanning and entropy code; Corresponding change of scale can be: 16 × 16,16 × 8,8 × 16,8 × 8,8 × 4,4 × 8,4 × 4 or other any length and width combinations; Corresponding alternative types can be: parameter in transformation matrix is different or have the conversion of different mathematical feature.
Corresponding to above-described embodiment, the embodiment of corresponding decode procedure can comprise: after received code code stream, according to the mark and the image block prediction indication that whether there is coded data for identification image block that obtain from encoding code stream, obtain the image block pattern conversion mark that image block is corresponding; And according to described image block pattern conversion mark, decode operation is carried out to respective image block.
Specifically can comprise in corresponding decoding operation procedures: after obtaining image block pattern conversion mark corresponding to image block, use the pattern conversion corresponding to this image block pattern conversion mark to carry out conversion process to coded data in image block.
Alternatively, the process obtaining image block pattern conversion mark corresponding to image block can comprise: if indicate an image block to comprise coded data in the mark that whether there is coded data for identification image block, then obtain image block pattern conversion mark corresponding to this image block according to image block prediction indication.
This process obtaining image block pattern conversion mark corresponding to this image block according to image block prediction indication specifically can comprise: when corresponding image block prediction indication uniquely can determine the pattern conversion that image block adopts, the pattern conversion of this image block directly can be determined according to image block prediction indication, or, if corresponding image block prediction indication uniquely cannot determine the pattern conversion that image block adopts, then show that needs obtain corresponding image block pattern conversion mark from encoding code stream, and then determine according to corresponding image block pattern conversion mark the pattern conversion that image block adopts.That is: if when corresponding image block prediction indication can determine the pattern conversion of this image block, do not need from encoding code stream, obtain image block pattern conversion mark corresponding to this image block, directly just can determine the pattern conversion that corresponding image block adopts, otherwise, then the image block pattern conversion mark corresponding according to this image block obtained from encoding code stream is needed to determine the pattern conversion that image block adopts.
In above-mentioned processing procedure, corresponding image block be predicted as infra-frame prediction or inter prediction.Corresponding prediction characteristic can refer to that corresponding to image block prediction indication one or one group of tile size are 4 × 4,4 × 8,8 × 4,8 × 8,8 × 16 or 16 × 8 or 16 × 16.Now, specifically can determine according to the size of image block prediction indication corresponding image block the pattern conversion that this image block adopts.
Further this implementation procedure based on the specific embodiment of image block prediction indication will be described in detail below.
In this embodiment, the set-up mode of macroblock coding template mark is identical with the set-up mode in the embodiment described before.And in encoding code stream macroblock coding template mark before or arrange one below for representing the mark (i.e. image block prediction indication) of sub-block prediction pattern, this mark is designated as PredType, it can be one 4 bit flag, each bit is for identifying the prediction mode of 1 luminance block, the sub-block of this mark place value corresponding to ' 1 ' expression uses infra-frame prediction or the inter prediction of 4 × 4, and the sub-block of this mark place value corresponding to ' 0 ' expression uses infra-frame prediction or the inter prediction of 8 × 8.
When the mark place value that sub-block is corresponding in low 4 of the mark of macroblock coding template is ' 0 ', then because this sub-block is not containing any coded data, therefore corresponding image block pattern conversion mark is not set for this sub-block; When mark place value corresponding in macroblock coding template low 4 of sub-block is 1, then judge whether to the numerical value of the corresponding positions in PredType that in encoding code stream, write corresponding image block pattern conversion identifies, and is specifically as follows together:
(1) if the value of corresponding flag bit is ' 1 ' in PredTyep, then this sub-block cannot use the conversion of 8 × 8,4 × 4 can only be used to convert, namely this sub-block can only carry out predicting with 4 × 4 block sizes, use 4 × 4 conversion and based on the quantification of 4 × 4 sizes, scanning and entropy code, the image block pattern conversion mark that now this sub-block is corresponding does not write in code stream;
(2) if the value of corresponding flag bit is ' 0 ' in PredTyep, then this sub-block can use the pattern conversion of 8 × 8 or the pattern conversion of 4 × 4, now, the image block pattern conversion mark that this sub-block is corresponding needs in write code stream to identify the pattern conversion that this sub-block uses.
Such as, if PredType is designated p3p2p1p0, wherein p0, p1, p2 and p3 are respectively the mark of the sub-block prediction pattern of the 0th to the 3rd luminance block, and hypothesis PredType value is ' 1011 '; If low four bit-identifies of the mark of macroblock coding template are m3m2m1m0, wherein m0, m1, m2 and m3 is respectively the bit of in macroblock coding template the 0th to the 3rd, if m0, m1, the numerical value that m2 and m3 is corresponding is ' 0 ', ' 1 ', ' 1 ' and ' 0 ', then to know in macroblock coding template that first and second contain coded data, and the mark in this PredType corresponding to two is respectively ' 1 ' and ' 0 ', then known 1st predictive mode that luminance block is corresponding must be 4 × 4 predictions, and therefore t1 does not need to write code stream; 2nd predictive mode that luminance block is corresponding can be 4 × 4 or 8 × 8 predictions, therefore t2 need write in code stream.If t0, t1, t2 and t3 are respectively the 0th, 1,2, the image block pattern conversion mark corresponding to 3 luminance block, only the value of t2 needs in write encoding code stream as the above analysis, and even the value of t2 is ' 1 ', then write bit ' 1 ' in code stream.According to above-mentioned analysis, corresponding image block pattern conversion mark the need of the Rule of judgment of write code stream be (! Pn) & & (! Mn), wherein n is the sequence number of sub-block, symbol ' & & ' presentation logic ' with ' relation, and if result 1 expression of Xiang Yuhou need to obtain corresponding image block pattern conversion mark, otherwise, do not need to obtain described image block pattern conversion mark.
Corresponding with this Application Example, in decoding end, then after receiving code stream, just can in corresponding MB header macroblock coding template decoding after determine each sub-block corresponding image block pattern conversion mark obtain manner.When in macroblock coding template, a bit place value is ' 1 ', show in the sub-block corresponding to this bit containing coded data, then determine whether from code stream, obtain image block pattern conversion mark corresponding to this sub-block according to the value of corresponding flag bit in the PredType of decoding acquisition, wherein:
(1) if the value of corresponding mark is ' 1 ' in PredType, then without the need to obtaining image block pattern conversion mark corresponding to this sub-block from code stream;
(2) if the value of corresponding mark is ' 0 ' in PredType, then need from code stream, obtain image block pattern conversion mark corresponding to this sub-block, and the pattern conversion utilizing corresponding image block pattern conversion to identify correspondence carries out decoding process to this sub-block.
Such as, if the PredType obtained that decodes from encoding code stream is designated p3p2p1 p0, wherein p0, p1, p2 and p3 are respectively the mark of the sub-block prediction pattern of the 0th to the 3rd luminance block, and set PredType value p3p2p1p0 as ' 1011 ', low four bit-identifies of the mark of macroblock coding template are m3m2m1m0, wherein m0, m1, m2 and m3 is respectively the bit of in the mark of macroblock coding template the 0th to the 3rd, if m0, m1, the numerical value that m2 and m3 is corresponding is ' 0 ', ' 1 ', ' 1 ' and ' 0 ', then can to know in macroblock coding template that first and second indicate in corresponding sub-block and comprise coded data, and the value of corresponding flag bit is respectively ' 1 ' and ' 0 ' in PredType corresponding to two, then: the 1st conversion that luminance block is corresponding must be 4 × 4 conversion, this sub-block need not obtain corresponding image block pattern conversion mark from code stream, and image block pattern conversion mark corresponding to the 2nd luminance block need obtain from code stream.Suppose t0 again, t1, t2 and t3 is respectively the 0th, 1,2, the image block pattern conversion mark corresponding to 3 luminance block, then the value of t2 needs to obtain from encoding code stream, if from encoding code stream, decoding obtains pattern conversion bit stream is ' 1 ', then the value that can obtain t2 is ' 1 ', and therefore the 2nd luminance block uses the pattern conversion of 8 × 8 to carry out decoding process.Because the 0th and the 3rd luminance block be not containing coded data, therefore do not need to use conversion to carry out decoding process, without the need to obtaining corresponding image block pattern conversion mark yet.
According to above-mentioned analysis, the need of obtain from code stream image block pattern conversion mark Rule of judgment for (! Pn) & & (! Mn), wherein n is the sequence number of sub-block, symbol ' & & ' presentation logic ' with ' relation, and if result 1 expression of Xiang Yuhou need to obtain corresponding image block pattern conversion mark, otherwise, do not need to obtain described image block pattern conversion mark.
The embodiment of the present invention additionally provides accordingly based on the code stream identification device that image block prediction indication realizes, and its specific implementation structure as shown in Figure 4, can comprise:
(1) second mark acquiring unit, for realizing the function of described first mark acquiring unit, it is specifically for obtaining image block pattern conversion mark corresponding to the described image block that arranges according to the mark being used for identification image block and whether existing coded data, the pattern conversion that uses for the image block prediction indication of the mark of identification image block prediction characteristic and image block; Wherein, corresponding image block prediction characteristic can for size when image block is predicted;
Alternatively, this second mark acquiring unit specifically can comprise following Unit two:
Whether the 3rd judging unit, indicate an image block to comprise coded data for whether existing in the mark of coded data for identification image block of judging to obtain from code stream;
Second mark determining unit, after whether identification image block exist in the mark of coded data and indicate an image block to comprise coded data, image block pattern conversion mark corresponding to this image block is set for determining at described 3rd judging unit according to image block prediction indication;
Process through above-mentioned Unit two just can carried out avoiding the image block for not comprising coded data to arrange corresponding image block pattern conversion mark, to save the overhead bit in code stream in image block pattern conversion mark setting up procedure;
Further, corresponding second mark determining unit specifically can comprise following Unit two:
4th judging unit, for judging whether the image block prediction indication obtained from code stream can determine the pattern conversion of this image block;
3rd mark determining unit, for when described 4th judging unit determination image block prediction indication can not determine the pattern conversion of this image block, arranges the image block pattern conversion mark that this image block is corresponding;
Process through above-mentioned Unit two just can carried out avoiding in image block pattern conversion mark setting up procedure as determining that the image of the pattern conversion adopted arranges corresponding image block pattern conversion mark, thus saves the overhead bit in code stream further.
(2) second write code stream unit, for realizing the function of described first write code stream unit, namely for writing in encoding code stream by the image block pattern conversion mark of described second mark acquiring unit;
Alternatively, after described image block pattern conversion mark specifically can be arranged at the mark and image block prediction indication that whether there is coded data for identification image block by corresponding second write code stream unit.
Corresponding with said apparatus, the embodiment of the present invention additionally provides corresponding decoding device, and its specific implementation structure as shown in Figure 5, can comprise:
(1) second pattern conversion acquiring unit, for realizing the function of described first pattern conversion acquiring unit, specifically for according to the mark and the image block prediction indication that whether there is coded data for identification image block that obtain from the encoding code stream received, obtain the image block pattern conversion mark that image block is corresponding;
Alternatively, this second pattern conversion acquiring unit specifically can comprise following Unit two:
Whether the 5th judging unit, indicate an image block to comprise coded data for the mark that whether there is coded data for identification image block judging to obtain from code stream;
Second pattern conversion reading unit, after the mark that whether there is coded data for determining identification image block at described 5th judging unit indicates an image block to comprise coded data, obtain image block pattern conversion mark corresponding to this image block according to image block prediction indication;
Further, corresponding second pattern conversion reading unit specifically can comprise following Unit two:
6th judging unit, for judging whether the image block prediction indication obtained from code stream can determine the pattern conversion of this image block;
3rd pattern conversion reading unit, for when described 6th judging unit determination image block prediction indication can not determine the pattern conversion of this image block, obtains the image block pattern conversion mark that this image block is corresponding from encoding code stream.
(2) second decoding units, for realizing the function of described first decoding unit, carry out decode operation specifically for the image block pattern conversion mark obtained according to described second pattern conversion acquiring unit to respective image block.
Specifically conversion process unit can be comprised in corresponding second decoding unit, for obtain image block pattern conversion mark corresponding to image block at described second pattern conversion acquiring unit after, the pattern conversion corresponding to this image block pattern conversion mark is used to carry out conversion process to coded data in image block.
The coding/decoding system of the embodiment of the present invention, comprises encoding apparatus and decoding apparatus, and wherein code device comprises the code stream identification device that the embodiment of the present invention provides, the decoding device that decoding device can adopt the embodiment of the present invention to provide.
Above embodiment range of application can also further expand to the Code And Decode of chrominance block pattern conversion, and principle is with the coding and decoding of luminance block pattern conversion.
Above-mentioned each embodiment of the present invention can be applied to various based in the coding-decoding operation process of adaptive block transformation, to improve encoding and decoding performance.
In sum, the realization of the embodiment of the present invention makes can to identify exactly in encoding code stream the pattern conversion that each sub-block adopts, thus ensure that can pattern conversion corresponding to each sub-block of Obtaining Accurate in decoding end, and then improves encoding and decoding performance.And, in the embodiment of the present invention, additionally use and corresponding image block pattern conversion mark is set after corresponding macroblock coding template, and corresponding image block pattern conversion mark determines whether to arrange according to the mark in macroblock coding template, namely respective image block pattern conversion mark is set according to actual needs, rationally to take overhead bit.Moreover, in the embodiment of the present invention, the setting of image block pattern conversion mark can also be carried out according to the mark of sub-block prediction pattern, thus the reasonable setting that image block pattern conversion identifies can be ensured further, save the overhead bit in encoding code stream.
The above; be only the present invention's preferably embodiment, but protection scope of the present invention is not limited thereto, is anyly familiar with those skilled in the art in the technical scope that the present invention discloses; the change that can expect easily or replacement, all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection range of claim.
Claims (21)
1. a code stream identification method, is characterized in that, comprising:
According to the pattern conversion that image block coding templet and image block use, image block pattern conversion mark corresponding to each sub-block in described image block is set, described image block coding templet comprises whether there is the mark of coded data for sub-block in identification image block, and described coded data refers to the residual error of image block after prediction, transform and quantization; Described pattern conversion refers to conversion and converts corresponding coding processing mode;
By in described image block pattern conversion mark write encoding code stream.
2. method according to claim 1, is characterized in that, the described process arranging image block pattern conversion mark corresponding to each sub-block in described image block comprises:
If image block coding templet indicates sub-block in this image block to comprise coded data, then the image block pattern conversion mark that sub-block in this image block is corresponding is set;
Or,
If image block coding templet indicates sub-block in an image block to comprise coded data, then arrange image block pattern conversion mark corresponding to sub-block in this image block according to image block prediction indication, described image block prediction indication is for identifying the prediction characteristic of described image block.
3. method according to claim 2, is characterized in that, described according to image block prediction indication arrange each sub-block in this image block corresponding image block pattern conversion mark process comprise:
If can determine according to image block prediction indication the pattern conversion that this image block adopts, then without the need to arranging image block pattern conversion mark corresponding to each sub-block in this image block, otherwise, the image block pattern conversion mark that each sub-block in this image block is corresponding is set.
4. method according to claim 3, is characterized in that, described image block prediction characteristic comprises: the tile size adopted when carrying out image block prediction.
5. method according to claim 4, is characterized in that, the method also comprises:
The tile size adopted when carrying out image block prediction corresponding to image block prediction indication determines the pattern conversion that in this image block, sub-block adopts.
6. method according to claim 2, it is characterized in that, after in described image block, the image block pattern conversion mark of sub-block is arranged at image block coding templet, or, after in described image block, the image block pattern conversion mark of sub-block is arranged at image block coding templet and image block prediction indication.
7. a code stream identification device, is characterized in that, comprising:
First mark acquiring unit, for obtaining the image block pattern conversion mark that in described image block that the pattern conversion that uses according to image block coding templet and image block arranges, each sub-block is corresponding, described image block coding templet comprises whether there is the mark of coded data for sub-block in identification image block, and described coded data refers to the residual error of image block after prediction, transform and quantization; Described pattern conversion refers to conversion and converts corresponding coding processing mode;
First write code stream unit, writes in encoding code stream for the image block pattern conversion mark obtained by described first mark acquiring unit.
8. device according to claim 7, is characterized in that,
Described first mark acquiring unit specifically comprises:
First judging unit, is used for judging that image block coding templet indicates sub-block in this image block whether to comprise coded data;
First mark determining unit, during for determining that at described first judging unit in this image block of described mark instruction, sub-block comprises coded data, determines to arrange the image block pattern conversion mark that in this image block, sub-block is corresponding;
Or,
Described first mark acquiring unit specifically comprises:
3rd judging unit, for judging in the image block coding templet that obtains from code stream that whether sub-block comprises coded data in indicating image block;
Second mark determining unit, after in indicating image block in described 3rd judging unit determination image block coding templet, sub-block comprises coded data, arrange image block pattern conversion mark corresponding to sub-block in this image block according to image block prediction indication, described image block prediction indication is for identifying the prediction characteristic of described image block.
9. device according to claim 8, is characterized in that, described second mark determining unit specifically comprises:
4th judging unit, for judging whether the image block prediction indication obtained from code stream can determine the pattern conversion of this image block;
3rd mark determining unit, for when described 4th judging unit determination image block prediction indication can not determine the pattern conversion of this image block, arranges the image block pattern conversion mark that each sub-block in this image block is corresponding.
10. device according to claim 7, it is characterized in that, after described image block pattern conversion mark is specifically arranged at the image block coding templet in encoding code stream by described first write code stream unit, or, after described image block pattern conversion is identified the image block coding templet and image block prediction indication be arranged in encoding code stream.
11. 1 kinds of coding/decoding methods, is characterized in that, comprising:
Received code code stream, obtain the image block coding templet in code stream, the image block pattern conversion mark that in image block, each sub-block is corresponding is obtained according to this image block coding templet, described image block coding templet comprises whether there is the mark of coded data for sub-block in identification image block, and described coded data refers to the residual error of image block after prediction, transform and quantization; Described pattern conversion refers to conversion and converts processing mode of decoding accordingly;
According to described image block pattern conversion mark, decode operation is carried out to corresponding image block.
12. methods according to claim 11, is characterized in that, the step obtaining the image block pattern conversion mark that in image block, each sub-block is corresponding comprises:
If sub-block comprises coded data in image block coding templet indicating image block, then read the image block pattern conversion mark that sub-block in this image block is corresponding;
Or,
If image block coding templet indicates sub-block in an image block to comprise coded data, then obtain image block pattern conversion mark corresponding to sub-block in this image block according to image block prediction indication, described image block prediction indication is for identifying the prediction characteristic of described image block.
13. methods according to claim 12, is characterized in that, described according to image block prediction indication obtain each sub-block in this image block corresponding image block pattern conversion mark process comprise:
When the pattern conversion of this image block can be determined according to image block prediction indication, determine the pattern conversion of sub-block in this image block according to image block prediction indication; Or
When can not determine the pattern conversion of this image block according to image block prediction indication, then from encoding code stream, obtain the pattern conversion mark of sub-block in described image block.
14. methods according to claim 13, is characterized in that, described image block predicted characteristics comprises: the tile size adopted when carrying out image block prediction.
15. methods according to claim 14, it is characterized in that, the method also comprises:
The tile size adopted when carrying out image block prediction corresponding to image block prediction indication determines the pattern conversion of sub-block in this image block.
16. methods according to claim 11, is characterized in that, described decode operation comprises:
After obtaining image block pattern conversion mark corresponding to image block, the pattern conversion corresponding to this image block pattern conversion mark is used to carry out conversion process to subblock coding data in this image block.
17. 1 kinds of decoding devices, is characterized in that, comprising:
First pattern conversion acquiring unit, for obtaining image block coding templet from the encoding code stream received, and obtain according to image block coding templet the image block pattern conversion mark that in image block, each sub-block is corresponding, described image block coding templet comprises whether there is the mark of coded data for sub-block in identification image block, and described coded data refers to the residual error of image block after prediction, transform and quantization; Described pattern conversion refers to conversion and converts processing mode of decoding accordingly;
First decoding unit, carries out decode operation for the image block pattern conversion mark obtained according to described first pattern conversion acquiring unit to corresponding image block.
18. devices according to claim 17, is characterized in that,
The first described pattern conversion acquiring unit specifically comprises:
Whether the second judging unit, for comprising coded data according to sub-block in the image block coding templet determination image block obtained from code stream;
First pattern conversion reading unit, after sub-block comprises coded data in described second judging unit determination image block, reads the image block pattern conversion mark that sub-block in this image block is corresponding from encoding code stream;
Or,
The first described pattern conversion acquiring unit specifically comprises:
5th judging unit, for judging whether the image block coding templet obtained from code stream indicates sub-block in an image block to comprise coded data;
Second pattern conversion reading unit, for indicating after sub-block comprises coded data in an image block at described 5th judging unit determination image block coding templet, obtains image block pattern conversion mark corresponding to sub-block in this image block according to image block prediction indication.
19. devices according to claim 18, is characterized in that, described second pattern conversion reading unit specifically comprises:
6th judging unit, for judging whether the image block prediction indication obtained from code stream can determine the pattern conversion of this image block;
3rd pattern conversion reading unit, for when described 6th judging unit determination image block prediction indication can not determine the pattern conversion of this image block, obtains the image block pattern conversion mark that sub-block in this image block is corresponding from encoding code stream.
20. devices according to claim 17, is characterized in that, described decoding unit comprises:
Conversion process unit, for get image block pattern conversion mark corresponding to each sub-block in image block at described first pattern conversion acquiring unit after, the pattern conversion corresponding to this image block pattern conversion mark is used to carry out conversion process to subblock coding data in this image block.
21. 1 kinds of coding/decoding systems, comprise encoding apparatus and decoding apparatus, it is characterized in that, described code device comprises code stream identification device, and described code stream identification device comprises:
First mark acquiring unit, for obtaining the image block pattern conversion mark that in described image block that the pattern conversion that uses according to image block coding templet and image block arranges, each sub-block is corresponding, described image block coding templet comprises whether there is the mark of coded data for sub-block in identification image block, and described coded data refers to the residual error of image block after prediction, transform and quantization; Described pattern conversion refers to conversion and converts corresponding encoding and decoding processing mode; And
First write code stream unit, writes in encoding code stream for the image block pattern conversion mark obtained by described first mark acquiring unit;
Described decoding device comprises:
First pattern conversion acquiring unit, for obtaining image block coding templet from the encoding code stream received, and obtains according to image block coding templet the image block pattern conversion mark that in image block, each sub-block is corresponding; And
First decoding unit, carries out decode operation for the image block pattern conversion mark obtained according to described first pattern conversion acquiring unit to corresponding image block.
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| CN102685487B (en) * | 2011-03-16 | 2015-07-08 | 华为技术有限公司 | Image coding and decoding methods, image coding and decoding equipment and network system |
| AU2012200345B2 (en) | 2012-01-20 | 2014-05-01 | Canon Kabushiki Kaisha | Method, apparatus and system for encoding and decoding the significance map residual coefficients of a transform unit |
| CN103024386B (en) * | 2012-12-14 | 2016-04-13 | 北京大学 | A kind of header encoding and decoding, coding/decoding method and device |
| CN103152570B (en) * | 2013-03-01 | 2016-02-24 | 北京大学 | A kind of video bit stream coding/decoding method and device |
| CN109923865A (en) * | 2017-03-22 | 2019-06-21 | 华为技术有限公司 | A kind of coding/decoding method of video data, decoding apparatus, coding method and code device |
| CN109462762B (en) * | 2018-10-26 | 2020-12-01 | 国网福建省电力有限公司漳州供电公司 | Image processing method for unmanned aerial vehicle aerial photography |
| CN111294601A (en) | 2018-12-07 | 2020-06-16 | 华为技术有限公司 | Video image decoding and encoding method and device |
| WO2020114509A1 (en) * | 2018-12-07 | 2020-06-11 | 华为技术有限公司 | Video image encoding and decoding method and apparatus |
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