CN101500160A - 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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- CN101500160A CN101500160A CNA200810056977XA CN200810056977A CN101500160A CN 101500160 A CN101500160 A CN 101500160A CN A200810056977X A CNA200810056977X A CN A200810056977XA CN 200810056977 A CN200810056977 A CN 200810056977A CN 101500160 A CN101500160 A CN 101500160A
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- 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 the image encoding and decoding technique field, relate in particular to a kind of code stream identification method, device and coding/decoding system.
Background technology
In video and image coding and decoding process,, need to adopt corresponding compression coding and decoding technology usually for reducing video and the view data data volume when transmitting or store.In video and image compression encoding process, need to adopt converter technique that picture material and information in one sub-picture, the zone are concentrated on a certain specific region after conversion, so that corresponding contents is effectively compressed at video compression algorithm.Specifically an area dividing in piece image or the image can be become plurality of small blocks or subregion (be called sub-piece, also can be referred to as image block), be that unit carries out conversion with sub-piece afterwards again.Wherein, the size of sub-piece can but be not limited to 4 * 4 or 8 * 8 etc., corresponding 4 and 8 all is unit with the image pixel.Usually the image block with 16 * 16 is an encoding and decoding processing unit in video and image encoding/decoding, and this unit is called macro block.A macro block may further be divided into the littler sub-piece of some sizes in addition, and sub-piece and macro block all can be referred to as image block.
In carrying out sub-piece partition process, specifically a specific region can be divided according to different sub-block sizes respectively, the sub-piece at different sizes carries out different conversion process then, is called the converter technique of adaptive block size.Here said conversion is meant the data processing method with certain mathematical characteristic, for example DCT (discrete cosine transform), wavelet transformation, integer transform etc.These conversion are represented with matrix form usually in video and image encoding/decoding.
When in the adaptive block sizes converter technique, having multiple pattern conversion, the part macro block can be used alone pattern conversion, described pattern conversion is meant conversion and the corresponding encoding and decoding processing mode of conversion, for example, size is that all sub-pieces all are divided into 8 * 8 sizes in 16 * 16 the macro block, and all sub-pieces all adopt 8 * 8 conversion and with conversion respective coding and decoding technique (promptly adopting a kind of pattern conversion).Simultaneously, sub-piece in the part macro block can use different pattern conversions, for example: in one 16 * 16 macro block,, then can use 4 * 4,4 * 8,8 * 4 and 8 * 8 each self-corresponding pattern conversion respectively if contain 4 * 4,4 * 8,8 * 4 and 8 * more than 8 seed block types.For this reason, corresponding marker bit be need in code stream, set and macro block and the employed pattern conversion of sub-piece are used to identify.
At present the mode of the employed pattern conversion of sign macro block that adopts is: can add a bit flag position and be used to represent that current macro uses is the pattern conversion of 8 * 8 correspondences or the pattern conversion of 4 * 4 correspondences in the macro block header.
In realizing process of the present invention, the inventor finds that there are the following problems at least in the prior art:
Owing to may have the sub-piece that is applicable to different conversion in (as macro block) in the image encoding base unit, different sub-pieces will adopt different pattern conversions, if only use the encoding characteristics of the whole coding base unit of the unified sign of a flag bit, then will reduce the flexibility of adaptive block sizes conversion, and then reduce the respective coding performance.
Summary of the invention
The embodiment of the invention provides 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 accurately identify the sub-piece pattern conversion that each image block adopts, thereby guarantee the flexibility of adaptive block sizes conversion, improve coding efficiency.
A kind of code stream identification method comprises:
The image block pattern conversion sign of described image block correspondence is set according to the pattern conversion of image block coding templet and image block use;
Described image block pattern conversion sign is write in the encoding code stream.
A kind of code stream identification device comprises:
The first sign acquiring unit is used to obtain the image block pattern conversion sign of the described image block correspondence that the pattern conversion that uses according to image block coding templet and image block is provided with;
First writes the code stream unit, is used for the image block pattern conversion sign that the described first sign acquiring unit obtains is write encoding code stream.
A kind of coding/decoding method comprises:
The received code code stream obtains the image block coding templet in the code stream, obtains the image block pattern conversion sign of image block correspondence according to this image block coding templet;
According to described image block pattern conversion sign corresponding image block is carried out decode operation.
A kind of decoding device comprises:
The first pattern conversion acquiring unit is used for obtaining the image block coding templet from the encoding code stream that receives, and obtains the image block pattern conversion sign of image block correspondence according to this image block coding templet;
First decoding unit, the image block pattern conversion sign that is used for obtaining according to the described first pattern conversion acquiring unit is carried out decode operation to corresponding image block.
A kind of coding/decoding system comprises encoding apparatus and decoding apparatus, and described code device comprises the code stream identification device, and described code stream identification device comprises:
The first sign acquiring unit is used to obtain the image block pattern conversion sign of the described image block correspondence that the pattern conversion that uses according to image block coding templet and image block is provided with; And
First writes the code stream unit, is used for the image block pattern conversion sign that the described first sign acquiring unit obtains is write encoding code stream.
Described decoding device comprises:
The first pattern conversion acquiring unit is used for obtaining the image block coding templet from the encoding code stream that receives, and obtains the image block pattern conversion sign of image block correspondence according to the image block coding templet; And
First decoding unit, the image block pattern conversion sign that is used for obtaining according to the described first pattern conversion acquiring unit is carried out decode operation to corresponding image block.
The technical scheme that is provided by the embodiment of the invention described above as can be seen, the realization of the embodiment of the invention makes can identify the pattern conversion that each image block adopts exactly in encoding code stream, and the encoded digital information decision according to image block writes image block pattern conversion label manner, thereby guaranteed accurately to obtain the pattern conversion of each image block correspondence, and can improve the encoding and decoding performance in decoding end.
Description of drawings
Code stream identification method and corresponding coding/decoding method schematic diagram that Fig. 1 provides for the embodiment of the invention;
The structural representation one of the identity device that Fig. 2 provides for the embodiment of the invention;
The structural representation one of the decoding device that Fig. 3 provides for the embodiment of the invention;
The structural representation two of the identity device that Fig. 4 provides for the embodiment of the invention;
The structural representation two of the decoding device that Fig. 5 provides for the embodiment of the invention.
Embodiment
In the embodiment of the invention, be respectively the pattern conversion that each image block adopts and be used for the sign whether the identification image piece exist coded data corresponding image block pattern conversion sign is set, identify the overhead bit that brings so that can accurately identify the pattern conversion of each image block employing and reduce, thereby improve the encoding and decoding performance because of writing.
In the standard of coding and decoding video, exist one to be used for the sign whether the identification image piece exists coded data usually, be referred to as image block coding templet (cbp or MbCBP).A macro block contains an image block coding templet in non-skip macroblock (skip macroblock i.e. this macro block does not carry out the Code And Decode process, and its coding or decoded data obtain from other image block by certain mode).
Generally, in the image with the 4:2:0 sampling, the image block coding templet is one 6 bit numbers, and the luminance component of a macro block is divided into the sub-piece of 48 * 8 sizes, and chromatic component is divided into the sub-piece of 28 * 8 sizes.4 bits in the image block coding templet of 6 bits (for example low four of the image block coding templet) are used to represent whether four luminance block contain coded data, if there is that then corresponding bit value of coded data to be made as ' 1 ', otherwise be made as ' 0 ' with luminance block; 2 bits in the image block coding templet of 6 bits (for example the image block coding templet is high 2) are used to represent whether two chrominance block contain coded data, if there is that then corresponding bit value of coded data to be made as ' 1 ', otherwise be made as ' 0 ' with luminance block.
In the 4:2:2 image encoded, the image block coding templet is one 8 bit numbers, and that principle is set is identical for the setting of bit value and image block coding templet under 4:2:0 samples in this moment image block coding templet.
Particularly, as shown in Figure 1, the processing of the pattern conversion that corresponding identification image piece adopts specifically can comprise: at coding side, can be according to the pattern conversion of image block coding templet and image block, the pattern conversion that uses for image block is provided with corresponding image block pattern conversion sign, and determine whether described image block pattern conversion sign needs to write in the encoding code stream, so that the pattern conversion that each image block of sign adopts in encoding code stream.Corresponding, behind decoding end received code code stream, just can from code stream, obtain the image block coding templet, and the obtain manner that the image block pattern conversion of each image block correspondence identifies in the decision macro block, so that corresponding image block is carried out decode operation according to the image block pattern conversion sign of obtaining.
In the embodiment of the invention, the image block pattern conversion of corresponding each image block correspondence identifies after the image block coding templet that specifically can write in the macro block header, like this, the relevant position obtains the image block pattern conversion sign of each image block correspondence in decoding end just can the macro block header from code stream.
Be described further below in conjunction with of the realization of concrete application example the embodiment of the invention.
In video encoding and decoding standard, be example with the macro block, corresponding image block coding templet is the macroblock coding template and is present in usually in the macro block header.In embodiments of the present invention, specifically the image block pattern conversion sign that is used for the employed pattern conversion of identification image piece can be combined with the sign (promptly be used to identify each macro block neutron piece and whether have coded data) that the macroblock coding template is used to identify macro block subblock coding data, promptly carry out the setting of image block pattern conversion sign according to the sign of sign macro block subblock coding data to be used for the concrete employed pattern conversion of each height piece (being image block) of sign.
By way of example, the sign of corresponding macroblock coding template can be the numerical value of one 6 bits, wherein:
(1) whether low 448 * 8 sub-pieces that are used to identify one 16 * 16 macro block of the sign of macroblock coding template exist the data of image encoding, and described image coded data is meant the residual error of image block behind prediction, transform and quantization; If there is not image coded data in certain sub-piece, then the value of its pairing flag bit in the macroblock coding template is made as 0, otherwise, be set to 1;
(2) high 2 of the sign of macroblock coding template is the indicating bit of chrominance block coded message.
The sign (being image block pattern conversion sign) that being used in the embodiment of the invention identifies sub-piece pattern conversion can be arranged on after the macroblock coding template.Group piece pairing sign place value in low 4 of macroblock coding template is 0 o'clock, then because of this sub-piece does not contain any coded data, so at this sub-piece corresponding image block pattern conversion sign is not set; Group piece pairing sign place value in low 4 of macroblock coding template is 1 o'clock, then at this sub-piece corresponding image block pattern conversion sign is set.For example, if low four bit-identifies of macroblock coding template are m3m2m1m0, m0 wherein, m1, m2 and m3 are respectively in the macroblock coding template the 0th to tertiary bit, if m0, m1, m2 and m3 value corresponding are ' 0 ', ' 1 ', ' 1 ' and ' 0 ', know that then first and second contains coded data (the 0th a pair of the 3rd does not contain coded data) in the macroblock coding template, the image block pattern conversion sign of these two pairing sub-pieces need write in the encoding code stream.Suppose t0, t1, t2 and t3 are respectively the 0th, 1,2,3 pairing image block pattern conversion signs of luminance block, then the value of t1 and t2 need write in the encoding code stream; If the value of t1 and t2 is respectively ' 1 ' and ' 0 ', then, then can write corresponding bit stream ' 01 ' if write in the code stream in the t2t1 mode, if write in the code stream, then can write corresponding bit stream ' 10 ' in the t1t2 mode.
Need to prove, when corresponding image block pattern conversion is designated 1, can be used to represent that this sub-piece has used 8 * 8 pattern conversions, promptly 8 * 8 conversion can 8 * 8 block sizes are predicted, use to this sub-piece and based on quantification, scanning and the entropy coding of 8 * 8 sizes; When corresponding image block pattern conversion is designated 0, can represent that then this sub-piece has used 4 * 4 pattern conversions, promptly 4 * 4 conversion can 4 * 4 block sizes are predicted, use to this sub-piece and based on quantification, scanning and the entropy coding of 4 * 4 sizes.This value implication only is an applicating example, also can adopt the implication of other values in the process that realizes the embodiment of the invention, with the pattern conversion of indicating corresponding sub-piece to adopt.For example, the size of corresponding sub-piece can also be 8 * 4,4 * 8,8 * 16,16 * 8 or 16 * 16 etc. and corresponding respectively different pattern conversion, at this moment, being provided with of each value of corresponding image block pattern conversion sign needs to distinguish the different pattern conversion of indication.
That is to say that in this application example, the pairing macroblock size of the sign of macroblock coding template can be n x m, wherein n and m are positive integer; The pattern conversion that in a macro block, can comprise two or more.Number for the pattern conversion that can comprise in the image block (being macro block) is by the image block pattern conversion sign decision that is provided with after the macroblock coding template.
Corresponding with this application example, in decoding end, then after receiving code stream, just can after the macroblock coding template decoding in the corresponding macro block header, determine the obtain manner of the image block pattern conversion sign of each height piece correspondence.When a bit place value is ' 1 ' in the macroblock coding template, show in the pairing sub-piece of this bit and contain coded data, then from the bit stream of representing sub-piece pattern conversion, read the image block pattern conversion sign of this bit correspondence, and utilize the corresponding pattern conversion of this image block pattern conversion sign that this sub-piece is carried out decoding processing.For example, if low four bit-identifies of the macroblock coding template that decoding obtains from encoding code stream are m3m2m1m0, m0 wherein, m1, m2 and m3 are respectively in the macroblock coding template the 0th to tertiary bit, if m0, m1, m2 and m3 value corresponding are ' 0 ', ' 1 ', ' 1 ' and ' 0 ', then as can be known in the macroblock coding template first and second contain coded data, the image block pattern conversion sign of these two pairing sub-pieces need be obtained from encoding code stream.If t0, t1, t2 and t3 are respectively the 0th, 1,2,3 pairing image block pattern conversion signs of luminance block, then the value of t1 and t2 need be obtained from encoding code stream.Decoding acquisition pattern conversion bit stream is ' 01 ' from encoding code stream, and the value that then can get t1 and t2 is respectively ' 1 ' and ' 0 ', and therefore the 1st and the 2nd luminance block uses ' 1 ' and ' 0 ' corresponding pattern conversion to carry out decoding processing respectively.Because the 0th and the 3rd luminance block do not contain coded data, so it need not use conversion to carry out decoding processing, need not to obtain corresponding image block pattern conversion sign yet.
The embodiment of the invention also provides a kind of code stream identification device, and its specific implementation structure can comprise as shown in Figure 2 with lower unit:
(1) first sign acquiring unit is used to obtain according to being used for the image block pattern conversion sign whether the identification image piece exists the described image block correspondence of the sign of coded data and the pattern conversion setting that image block uses; This first sign acquiring unit specifically can comprise:
First judging unit is used for judging being used for the sign whether the identification image piece exist coded data indicates this image block whether to comprise coded data;
The first sign determining unit is used for when described first judging unit determines that described sign indicates this image block to comprise coded data, determines the image block pattern conversion sign of this image block correspondence of setting.
Alternatively, this first writes the code stream unit and specifically described image block pattern conversion sign can be arranged at and be used in the encoding code stream after the sign that whether the identification image piece exist coded data.
(2) first write the code stream unit, are used for the image block pattern conversion sign that the described first sign acquiring unit obtains is write encoding code stream, so that receiving terminal can accurately obtain the pattern conversion that corresponding image block adopts.
In said apparatus, the respective coding data can be: the residual error data after prediction in the macro block, the residual error data after prediction, data through producing in data, motion vector difference or the video coding process after the transform and quantization.
In said apparatus, corresponding pattern conversion can be the conversion of different change of scales; Perhaps, dissimilar conversion; Perhaps, the combination of different change of scales and different alternative types; Perhaps, the conversion of different change of scales and with conversion corresponding quantitative, scanning and entropy coding in one or multinomial combination; Perhaps, dissimilar conversion and with conversion corresponding quantitative, scanning and entropy coding in one or multinomial combination; Perhaps, the conversion of different change of scales and with conversion corresponding quantitative, scanning and entropy coding in one or multinomial combination with, and dissimilar conversion and with conversion corresponding quantitative, scanning and entropy coding in one or multinomial combination; Corresponding change of scale then can for: 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 is can be for: parameter in the transformation matrix different or have a conversion of different mathematical features.
The embodiment of the invention also provides a kind of decoding device, and its specific implementation structure mainly can comprise as shown in Figure 3 with lower unit:
(1) first pattern conversion acquiring unit is used for obtaining from the encoding code stream that receives and is used for the sign whether the identification image piece exists coded data, and obtains the image block pattern conversion sign of image block correspondence according to this sign;
Alternatively, this first pattern conversion acquiring unit specifically can comprise:
Second judging unit is used for judging whether be used for the identification image piece exists the sign indicating image piece of coded data whether to comprise coded data;
The first pattern conversion reading unit, be used for after described first judging unit is identified for sign indicating image piece that whether the identification image piece exist coded data and comprises coded data, from encoding code stream, reading the image block pattern conversion sign of this image block correspondence.
(2) first decoding units, the image block pattern conversion sign that is used for obtaining according to the described first pattern conversion acquiring unit is carried out decode operation to corresponding image block;
Alternatively, this decoding unit specifically can comprise the conversion process unit, be used for after the described first pattern conversion acquiring unit gets access to the image block pattern conversion sign of image block correspondence, using this image block pattern conversion to identify pairing pattern conversion coded data in this image block being carried out conversion process.
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 invention, consider the image block prediction indication that is used for identification image piece prediction characteristic accordingly can also be set that then corresponding image block pattern conversion sign set-up mode can also adopt following scheme to realize in encoding-decoding process:
According to being used for the image block pattern conversion sign that pattern conversion that sign (being the image block coding templet), image block prediction indication and image block that whether the identification image piece exist coded data use is provided with described image block correspondence, and described image block pattern conversion sign is write in the encoding code stream; Wherein, corresponding image block prediction indication is used for identification image piece prediction characteristic, the size as can predict the time for image block, and this prediction characteristic can also comprise the predictive mode that image block adopts, as the combination of infra-frame prediction or inter prediction or two kinds of situations.
Wherein, whether the process that the image block pattern conversion sign of described image block correspondence is set can comprise: if exist sign indication one image block of coded data to comprise coded data being used for the identification image piece, the image block pattern conversion sign of this image block correspondence then is set according to the image block prediction indication, particularly can be for can uniquely determine the pattern conversion that this image block adopts according to corresponding image block prediction indication the time, then need not to be provided with the image block pattern conversion sign of this image block correspondence, promptly need not to be provided with corresponding image block pattern conversion sign this moment and can guarantee still that also receiving terminal can know the pattern conversion that this image block adopts, then can omit this image block pattern conversion sign, to save overhead bit; If the corresponding image block prediction indication of basis can't uniquely be determined the pattern conversion of this image block employing, the image block pattern conversion sign of this image block correspondence need be set in code stream then.Adopt this technical scheme to make and only just in the respective coding code stream, carry out the setting that corresponding image block pattern conversion identifies when needed, so can effectively save the overhead bit in the code stream.
In above-mentioned processing procedure, the prediction of respective image piece can be infra-frame prediction or inter prediction.The prediction characteristic of image block wherein can refer to that then image block prediction indication pairing one or one group of image block 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 the pattern conversion that this image block adopts according to the size of image block prediction indication corresponding image piece.
In this embodiment, corresponding image block pattern conversion sign specifically can be arranged at and be used for after the sign and image block prediction indication that whether the identification image piece exist coded data.
In this embodiment, the respective coding data can be: the residual error data after prediction in the macro block, the residual error data after prediction, data through producing in data, motion vector difference or the video coding process after the transform and quantization.
Corresponding pattern conversion can be the conversion of different change of scales; Perhaps, dissimilar conversion; Perhaps, the combination of different change of scales and different alternative types; Perhaps, the conversion of different change of scales and with conversion corresponding quantitative, scanning and entropy coding in one or multinomial combination; Perhaps, dissimilar conversion and with conversion corresponding quantitative, scanning and entropy coding in one or multinomial combination; Perhaps, the conversion of different change of scales and with conversion corresponding quantitative, scanning and entropy coding in one or multinomial combination, and dissimilar conversion and with conversion corresponding quantitative, scanning and entropy coding in one or multinomial combination; Corresponding change of scale can for: 16 * 16,16 * 8,8 * 16,8 * 8,8 * 4,4 * 8,4 * 4 or other any length and width combinations; Corresponding alternative types is can be for: the parameter in the transformation matrix different or have a conversion of different mathematical features.
Corresponding to the foregoing description, the embodiment of corresponding decode procedure can comprise: behind the received code code stream, according to sign and the image block prediction indication whether the identification image piece exists coded data that be used for that from encoding code stream, obtains, obtain the image block pattern conversion sign of image block correspondence; And the respective image piece is carried out decode operation according to described image block pattern conversion sign.
In corresponding decode operation process, specifically can comprise: after obtaining the image block pattern conversion sign of image block correspondence, use this image block pattern conversion to identify pairing pattern conversion coded data in the image block is carried out conversion process.
Alternatively, the process of obtaining the image block pattern conversion sign of image block correspondence can comprise: if whether exist sign indication one image block of coded data to comprise coded data being used for the identification image piece, then obtain the image block pattern conversion sign of this image block correspondence according to the image block prediction indication.
This specifically can comprise according to the process that the image block prediction indication obtains the image block pattern conversion sign of this image block correspondence: when the pattern conversion that corresponding image block prediction indication can unique definite image block adopts, can directly determine the pattern conversion of this image block according to the image block prediction indication, perhaps, if the pattern conversion that corresponding image block prediction indication can't unique definite image block adopts, then show and from encoding code stream, to obtain corresponding image block pattern conversion sign, and then determine the pattern conversion that image block adopts according to corresponding image block pattern conversion sign.That is: in the time of determining the pattern conversion of this image block as if corresponding image block prediction indication, do not need from encoding code stream, to obtain the image block pattern conversion sign of this image block correspondence, directly just can determine the pattern conversion that corresponding image block adopts, otherwise, then need to determine the pattern conversion that image block adopts according to the image block pattern conversion sign of this image block correspondence of from encoding code stream, obtaining.
In above-mentioned processing procedure, corresponding image block be predicted as infra-frame prediction or inter prediction.Corresponding prediction characteristic can refer to that image block prediction indication pairing one or one group of image block size are 4 * 4,4 * 8,8 * 4,8 * 8,8 * 16 or 16 * 8 or 16 * 16.At this moment, specifically can determine the pattern conversion that this image block adopts according to the size of image block prediction indication corresponding image piece.
To further be elaborated below to this implementation procedure based on the specific embodiment of image block prediction indication.
In this embodiment, the set-up mode of macroblock coding template mark is identical with set-up mode among the embodiment that describes before.And the front of the sign of macroblock coding template or back are provided with a sign (being the image block prediction indication) that is used to represent sub-block prediction mode in encoding code stream, this sign is designated as PredType, it can be one 4 bit flag, each bit is used to identify the prediction mode of 1 luminance block, this sign place value is that the pairing sub-piece of ' 1 ' expression uses 4 * 4 infra-frame prediction or inter prediction, and this sign place value is that the pairing sub-piece of ' 0 ' expression uses 8 * 8 infra-frame prediction or inter prediction.
The group piece is when pairing sign place value be ' 0 ' in low 4 of the sign of macroblock coding template, then because of this sub-piece does not contain any coded data, so the image block pattern conversion that correspondence is not set at this sub-piece identifies; Group piece pairing sign place value in low 4 of macroblock coding template is 1 o'clock, and then the numerical value of the corresponding positions in PredType judges whether to write corresponding image block pattern conversion sign in encoding code stream, is specifically as follows:
(1) if the value of corresponding flag bit is ' 1 ' among the PredTyep, then this sub-piece cannot use 8 * 8 conversion, can only use 4 * 4 conversion, promptly 4 * 4 conversion be predicted, be used to this sub-piece can only and based on quantification, scanning and the entropy coding of 4 * 4 sizes with 4 * 4 block sizes, and the image block pattern conversion of this sub-piece correspondence identified and do not write in the code stream this moment;
(2) if the value of corresponding flag bit is ' 0 ' among the PredTyep, then this sub-piece can use 8 * 8 pattern conversion or 4 * 4 pattern conversion, at this moment, the image block pattern conversion of this sub-piece correspondence sign need write in the code stream to identify the employed pattern conversion of this sub-piece.
For example, establish PredType and be designated p3p2p1p0, p0 wherein, p1, p2 and p3 are respectively the sign of the sub-block prediction mode of the 0th to the 3rd luminance block, and hypothesis PredType value is ' 1011 '; If low four bit-identifies of the sign of macroblock coding template are m3m2m1m0, m0 wherein, m1, m2 and m3 are respectively in the macroblock coding template the 0th to tertiary bit, if m0, m1, m2 and m3 value corresponding are ' 0 ', ' 1 ', ' 1 ' and ' 0 ', know that then first and second contains coded data in the macroblock coding template, and the sign among these two pairing PredType is respectively ' 1 ' and ' 0 ', then the predictive mode of the 1st luminance block correspondence must be 4 * 4 predictions as can be known, so t1 need not write code stream; The predictive mode of the 2nd luminance block correspondence can be 4 * 4 or 8 * 8 predictions, so t2 need write in the code stream.If t0, t1, t2 and t3 are respectively the 0th, 1,2,3 pairing image block pattern conversion signs of luminance block, only the value of t2 need write in the encoding code stream as the above analysis, and even the value of t2 is ' 1 ', then writes bit ' 1 ' in the code stream.According to above-mentioned analysis as can be known, the Rule of judgment whether corresponding image block pattern conversion sign needs to write code stream for (! Pn) ﹠amp; ﹠amp; (! Mn), wherein n is the sequence number of sub-piece, symbol ‘ ﹠amp; ﹠amp; ' presentation logic ' with ' relation, and if 1 expression of the result of Xiang Yuhou need obtain corresponding image block pattern conversion sign, otherwise, do not need to obtain described image block pattern conversion sign.
Corresponding with this Application Example, in decoding end, then after receiving code stream, just can after the macroblock coding template decoding in the corresponding macro block header, determine the obtain manner of the image block pattern conversion sign of each height piece correspondence.When a bit place value is ' 1 ' in the macroblock coding template, show in the pairing sub-piece of this bit and contain coded data, then determine whether from code stream, to obtain the image block pattern conversion sign of this sub-piece correspondence according to the value of corresponding flag bit among the PredType of decoding acquisition, wherein:
(1), then need not from code stream, to obtain the image block pattern conversion sign of this sub-piece correspondence if the value of corresponding sign is ' 1 ' among the PredType;
(2), then need from code stream, to obtain the image block pattern conversion sign of this sub-piece correspondence, and utilize the corresponding pattern conversion of corresponding image block pattern conversion sign that this sub-piece is carried out decoding processing if the value of corresponding sign is ' 0 ' among the PredType.
For example, establish from encoding code stream the PredType that decoding obtains and be designated p3p2p1p0, p0 wherein, p1, p2 and p3 are respectively the sign of the sub-block prediction mode of the 0th to the 3rd luminance block, and to establish PredType value p3p2p1p0 be ' 1011 '; Low four bit-identifies of the sign of macroblock coding template are m3m2m1m0, m0 wherein, m1, m2 and m3 are respectively in the sign of macroblock coding template the 0th to tertiary bit, if m0, m1, m2 and m3 value corresponding are ' 0 ', ' 1 ', ' 1 ' and ' 0 ', then can know in the macroblock coding template in first and second corresponding sub-piece of indication to comprise coded data, and the value of corresponding flag bit is respectively ' 1 ' and ' 0 ' among two pairing PredType, then: the conversion of the 1st luminance block correspondence must be 4 * 4 conversion, and this sub-piece does not need to obtain corresponding image block pattern conversion sign from code stream; And the image block pattern conversion of the 2nd luminance block correspondence sign needs to obtain from code stream.Suppose t0 again, t1, t2 and t3 are respectively the 0th, 1,2,3 pairing image block pattern conversion signs of luminance block, then the value of t2 need be obtained from encoding code stream, if decoding acquisition pattern conversion bit stream is ' 1 ' from encoding code stream, the value that then can get t2 is ' 1 ', and therefore the pattern conversion of the 2nd luminance block use 8 * 8 carries out decoding processing.Because the 0th and the 3rd luminance block do not contain coded data,, also need not to obtain corresponding image block pattern conversion sign so need not use conversion to carry out decoding processing.
According to above-mentioned analysis as can be known, the Rule of judgment that whether needs from code stream, to obtain image block pattern conversion sign for (! Pn) ﹠amp; ﹠amp; (! Mn), wherein n is the sequence number of sub-piece, symbol ‘ ﹠amp; ﹠amp; ' presentation logic ' with ' relation, and if 1 expression of the result of Xiang Yuhou need obtain corresponding image block pattern conversion sign, otherwise, do not need to obtain described image block pattern conversion sign.
The embodiment of the invention also provides the code stream identification device of realizing based on the image block prediction indication accordingly, and its specific implementation structure can comprise as shown in Figure 4:
(1) second sign acquiring unit, be used to realize the function of the described first sign acquiring unit, it specifically is used to obtain the image block pattern conversion sign of the described image block correspondence that is provided with according to the image block prediction indication of the sign that is used for sign that whether the identification image piece exist coded data, is used for identification image piece prediction characteristic and pattern conversion that image block uses; Size when wherein, corresponding image block prediction characteristic can be predicted for image block;
Alternatively, this second sign acquiring unit specifically can comprise following Unit two:
Whether the 3rd judging unit is used for judging from what code stream obtained being used for the sign whether the identification image piece exist coded data and indicating an image block to comprise coded data;
The second sign determining unit, be used for after described the 3rd judging unit is identified for sign indication one image block that whether the identification image piece exist coded data and comprises coded data, the image block pattern conversion sign of this image block correspondence being set according to the image block prediction indication;
Processing through above-mentioned Unit two just can be avoided in carrying out image block pattern conversion sign setting up procedure for the image block that does not comprise coded data is provided with corresponding image block pattern conversion sign, to save the overhead bit in the code stream;
Further, the corresponding second sign determining unit specifically can comprise following Unit two:
The 4th judging unit is used to judge whether the image block prediction indication that obtains from code stream can determine the pattern conversion of this image block;
The 3rd sign determining unit is used for when described the 4th judging unit determines that the image block prediction indication can not be determined the pattern conversion of this image block, and the image block pattern conversion sign of this image block correspondence is set;
The processing of the above-mentioned Unit two of process just can be avoided the corresponding image block pattern conversion sign of image setting for the pattern conversion that can determine to adopt in carrying out image block pattern conversion sign setting up procedure, thereby further saves the overhead bit in the code stream.
(2) second write the code stream unit, are used to realize that described first writes the function of code stream unit, promptly are used for the image block pattern conversion sign of the described second sign acquiring unit is write encoding code stream;
Alternatively, corresponding second write the code stream unit and specifically described image block pattern conversion sign can be arranged at and be used for after the sign and image block prediction indication that whether the identification image piece exist coded data.
Corresponding with said apparatus, the embodiment of the invention also provides corresponding decoding device, and its specific implementation structure can comprise as shown in Figure 5:
(1) second pattern conversion acquiring unit, be used to realize the function of the described first pattern conversion acquiring unit, specifically be used for according to sign and the image block prediction indication whether the identification image piece exists coded data that be used for that obtains from the encoding code stream that receives, obtain the image block pattern conversion sign of image block correspondence;
Alternatively, this second pattern conversion acquiring unit specifically can comprise following Unit two:
Whether the 5th judging unit is used for judging from what code stream obtained being used for the sign whether the identification image piece exist coded data and indicating an image block to comprise coded data;
The second pattern conversion reading unit, be used for after described the 5th judging unit is identified for sign that whether the identification image piece exist coded data and indicates an image block to comprise coded data, obtaining the image block pattern conversion sign of this image block correspondence according to the image block prediction indication;
Further, the corresponding second pattern conversion reading unit specifically can comprise following Unit two:
The 6th judging unit is used for judging whether the image block prediction indication that obtains from code stream can determine the pattern conversion of this image block;
The 3rd pattern conversion reading unit is used for when described the 6th judging unit determines that the image block prediction indication can not be determined the pattern conversion of this image block, obtains the image block pattern conversion sign of this image block correspondence from encoding code stream.
(2) second decoding units are used to realize the function of described first decoding unit, and the image block pattern conversion sign that specifically is used for obtaining according to the described second pattern conversion acquiring unit is carried out decode operation to the respective image piece.
In corresponding second decoding unit, specifically can comprise the conversion process unit, be used for after the described second pattern conversion acquiring unit obtains the image block pattern conversion sign of image block correspondence, using this image block pattern conversion to identify pairing pattern conversion coded data in the image block being carried out conversion process.
The coding/decoding system of the embodiment of the invention comprises encoding apparatus and decoding apparatus, and wherein the code stream identification device that the embodiment of the invention provides, the decoding device that decoding device can adopt the embodiment of the invention to provide are provided code device.
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 invention can be applied in the various coding-decoding operation processes based on adaptive block transformation, to improve the encoding and decoding performance.
In sum, the realization of the embodiment of the invention makes and can identify the pattern conversion that each height piece adopts exactly in encoding code stream, thereby guaranteed can accurately obtain in decoding end the pattern conversion of each sub-piece correspondence, and then improves the encoding and decoding performance.And, in the embodiment of the invention, also adopted corresponding image block pattern conversion sign has been set after corresponding macroblock coding template, and corresponding image block pattern conversion sign is to determine whether to be provided with according to the sign in the macroblock coding template, respective image piece pattern conversion sign promptly is set according to actual needs, rationally to take overhead bit.Moreover, in the embodiment of the invention, the setting of image block pattern conversion sign can also be carried out, thereby the reasonable setting of image block pattern conversion sign can be further guaranteed according to the sign of sub-block prediction mode, save the overhead bit in the encoding code stream.
The above; only for the preferable embodiment of the present invention, but protection scope of the present invention is not limited thereto, and anyly is familiar with those skilled in the art in the technical scope that the present invention discloses; the variation 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 kind of code stream identification method is characterized in that, comprising:
The image block pattern conversion sign of described image block correspondence is set according to the pattern conversion of image block coding templet and image block use;
Described image block pattern conversion sign is write in the encoding code stream.
2, method according to claim 1 is characterized in that, described image block coding templet comprises and be used for the sign whether the identification image piece exists coded data that the described process that the image block pattern conversion sign of described image block correspondence is set comprises:
If the image block coding templet indicates this image block to comprise coded data, the image block pattern conversion sign of this image block correspondence is set then;
Perhaps,
If the image block coding templet indicates an image block to comprise coded data, the image block pattern conversion sign of this image block correspondence then is set according to the image block prediction indication, described image block prediction indication is used to identify the prediction characteristic of described image block.
3, method according to claim 2 is characterized in that, the described process that the image block pattern conversion sign of this image block correspondence is set according to the image block prediction indication comprises:
If can determine the pattern conversion that this image block adopts, then need not to be provided with the image block pattern conversion sign of this image block correspondence, otherwise the image block pattern conversion that this image block correspondence is set identifies according to the image block prediction indication.
4, method according to claim 3 is characterized in that, described image block prediction characteristic comprises: the image block size that adopts when carrying out the image block prediction.
5, method according to claim 4 is characterized in that, this method also comprises:
Determine the pattern conversion that this image block adopts according to the pairing image block size that when carrying out the image block prediction, adopts of image block prediction indication.
6, method according to claim 2 is characterized in that, described image block pattern conversion sign is arranged at after the image block coding templet, and perhaps, described image block pattern conversion sign is arranged at after image block coding templet and the image block prediction indication.
7, a kind of code stream identification device is characterized in that, comprising:
The first sign acquiring unit is used to obtain the image block pattern conversion sign of the described image block correspondence that the pattern conversion that uses according to image block coding templet and image block is provided with;
First writes the code stream unit, is used for the image block pattern conversion sign that the described first sign acquiring unit obtains is write encoding code stream.
8, device according to claim 7 is characterized in that,
The described first sign acquiring unit specifically comprises:
First judging unit is used for judging the image block coding templet indicates this image block whether to comprise coded data;
The first sign determining unit is used for when described first judging unit determines that described sign indicates this image block to comprise coded data, determines the image block pattern conversion sign of this image block correspondence of setting;
Perhaps,
The described first sign acquiring unit specifically comprises:
The 3rd judging unit is used for judging whether the indicating image piece comprises coded data from the image block coding templet that code stream obtains;
The second sign determining unit, be used for after described the 3rd judging unit determines that image block coding templet indicating image piece comprises coded data, the image block pattern conversion that this image block correspondence is set according to the image block prediction indication identifies, and described image block prediction indication is used to identify the prediction characteristic of described image block.
9, device according to claim 8 is characterized in that, the described second sign determining unit specifically comprises:
The 4th judging unit is used to judge whether the image block prediction indication that obtains from code stream can determine the pattern conversion of this image block;
The 3rd sign determining unit is used for when described the 4th judging unit determines that the image block prediction indication can not be determined the pattern conversion of this image block, and the image block pattern conversion sign of this image block correspondence is set.
10, device according to claim 7, it is characterized in that, described first writes the code stream unit specifically identifies described image block pattern conversion after the image block coding templet that is arranged in the encoding code stream, perhaps, described image block pattern conversion is identified after the image block coding templet and image block prediction indication that is arranged in the encoding code stream.
11, a kind of coding/decoding method is characterized in that, comprising:
The received code code stream obtains the image block coding templet in the code stream, obtains the image block pattern conversion sign of image block correspondence according to this image block coding templet;
According to described image block pattern conversion sign corresponding image block is carried out decode operation.
12, method according to claim 11 is characterized in that, the step of obtaining the image block pattern conversion sign of image block correspondence comprises:
If image block coding templet indicating image piece comprises coded data, then read the image block pattern conversion sign of this image block correspondence;
Perhaps,
If the image block coding templet indicates an image block to comprise coded data, then obtain the image block pattern conversion sign of this image block correspondence according to the image block prediction indication, described image block prediction indication is used to identify the prediction characteristic of described image block.
13, method according to claim 12 is characterized in that, the described process of obtaining the image block pattern conversion sign of this image block correspondence according to the image block prediction indication comprises:
In the time can determining the pattern conversion of this image block, determine the pattern conversion of this image block according to the image block prediction indication according to the image block prediction indication; Perhaps
When can not determine the pattern conversion of this image block, then from encoding code stream, obtain described image block pattern conversion sign according to the image block prediction indication.
14, method according to claim 13 is characterized in that, described image block predicted characteristics comprises: the image block size that adopts when carrying out the image block prediction.
15, method according to claim 14 is characterized in that, this method also comprises:
Determine the pattern conversion of this image block according to the pairing image block size that when carrying out the image block prediction, adopts of image block prediction indication.
16, method according to claim 11 is characterized in that, described decode operation comprises:
After obtaining the image block pattern conversion sign of image block correspondence, use this image block pattern conversion to identify pairing pattern conversion coded data in this image block is carried out conversion process.
17, a kind of decoding device is characterized in that, comprising:
The first pattern conversion acquiring unit is used for obtaining the image block coding templet from the encoding code stream that receives, and obtains the image block pattern conversion sign of image block correspondence according to the image block coding templet;
First decoding unit, the image block pattern conversion sign that is used for obtaining according to the described first pattern conversion acquiring unit is carried out decode operation to corresponding image block.
18, device according to claim 17 is characterized in that,
The described first pattern conversion acquiring unit specifically comprises:
Second judging unit is used for determining according to the image block coding templet that obtains from code stream whether image block comprises coded data;
The first pattern conversion reading unit is used for after described first judging unit determines that image block comprises coded data, reads the image block pattern conversion sign of this image block correspondence from encoding code stream;
Perhaps,
The described first pattern conversion acquiring unit specifically comprises:
The 5th judging unit is used for judging whether the image block coding templet that obtains from code stream indicates an image block to comprise coded data;
The second pattern conversion reading unit is used for after described the 5th judging unit determines that the image block coding templet indicates an image block to comprise coded data, obtains the image block pattern conversion sign of this image block correspondence according to the image block prediction indication.
19, device according to claim 18 is characterized in that, the described second pattern conversion reading unit specifically comprises:
The 6th judging unit is used for judging whether the image block prediction indication that obtains from code stream can determine the pattern conversion of this image block;
The 3rd pattern conversion reading unit is used for when described the 6th judging unit determines that the image block prediction indication can not be determined the pattern conversion of this image block, obtains the image block pattern conversion sign of this image block correspondence from encoding code stream.
20, device according to claim 17 is characterized in that, described decoding unit comprises:
The conversion process unit is used for using this image block pattern conversion to identify pairing pattern conversion coded data in this image block being carried out conversion process after the described first pattern conversion acquiring unit gets access to the image block pattern conversion sign of image block correspondence.
21, a kind of coding/decoding system comprises encoding apparatus and decoding apparatus, it is characterized in that, described code device comprises the code stream identification device, and described code stream identification device comprises:
The first sign acquiring unit is used to obtain the image block pattern conversion sign of the described image block correspondence that the pattern conversion that uses according to image block coding templet and image block is provided with; And
First writes the code stream unit, is used for the image block pattern conversion sign that the described first sign acquiring unit obtains is write encoding code stream.
Described decoding device comprises:
The first pattern conversion acquiring unit is used for obtaining the image block coding templet from the encoding code stream that receives, and obtains the image block pattern conversion sign of image block correspondence according to the image block coding templet; And
First decoding unit, the image block pattern conversion sign that is used for obtaining according to the described first pattern conversion acquiring unit is carried out decode operation to corresponding image block.
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