CN105530518A - Video encoding method, and video decoding method and device - Google Patents
Video encoding method, and video decoding method and device Download PDFInfo
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Abstract
The invention discloses a video encoding method, which is used for increasing video encoding compression ratio. The video encoding method comprises the steps of: setting size of each maximum encoding unit corresponding to a current video frame to be greater than 64*64; dividing each maximum encoding unit into encoding units according to a quadtree structure; for each encoding unit, at least acquiring a corresponding prediction residual in at least one encoding mode through a divided prediction unit; for each encoding unit, calculating a transformation coefficient matrix corresponding to a transformation unit according to at least one prediction residual through the transformation unit; and determining an optimal dividing method according to the prediction residuals and the transformation coefficient matrixes corresponding to the maximum encoding units when different dividing methods are adopted. The invention further discloses a corresponding video decoding method and a corresponding video decoding device.
Description
Technical field
The present invention relates to coding techniques field, particularly a kind of Video coding, coding/decoding method and device.
Background technology
HEVC (HighEfficiencyVideoCoding, high efficiency Video coding) is a kind of new video compression standard, can substitute H.264/AVC (a kind of video encoding standard) coding standard to a certain extent.
HEVC can make the video of 1080P compression efficiency when compressing improve about 50%, and this just means that the quality of video will rise a lot, and can save a large amount of network bandwidths, for consumers, can enjoy higher-quality video content.
But in prior art, many application such as remote desktop access, remote game, cloud computing are very general, the very important feature of of this type of application is exactly the information such as image being mixed with word and Practical computer teaching in natural video frequency.And often may there is some pattern (as some character, icon and lines) in the information such as the image of word and Practical computer teaching repeatedly, such as by the PCB (PrintedCircuitBoard of computer drawing, printed circuit board (PCB)), just there is horizontal line and the vertical line of a large amount of repetition.Compared with natural video frequency sequence, more by the image texture of Practical computer teaching, be considered as containing a large amount of high-frequency information in Video coding, adopt HEVC to encode to it, effect is not fine.
Because this type of has the video of a large amount of duplicate message, in space, adjacent area often duplicates information, also usually occurs that continuous print is encoded as the region of model identical at time domain adjacent area, mean the space of this type of video and temporal correlation stronger.And in HEVC encode time traditional block partition mode well cannot remove this correlation, cause compression coding lower, coding quality is poor.
Summary of the invention
The embodiment of the present invention provides a kind of Video coding, coding/decoding method and device, for solving the technical problem that compression coding is lower when encoding to the video with a large amount of duplicate message.
A kind of method for video coding, comprising:
Each maximum coding unit corresponding for current video frame is handled as follows, wherein, described maximum coding unit is of a size of first size, and described first size is greater than 64*64: according to quad-tree structure, and described maximum coding unit is divided into coding unit respectively; To each coding unit obtained according to different demarcation mode, predicted according at least one coding mode by the predicting unit divided by described coding unit, at least obtain the prediction residual that described coding unit is corresponding under described at least one coding mode respectively; To each coding unit obtained according to often kind of dividing mode, the prediction residual corresponding according to this coding unit obtained by converter unit calculates, and obtains the transform coefficient matrix that described coding unit is corresponding; Wherein, described converter unit is divided by described coding unit and obtains, and described converter unit minimizes encoding rate distortion cost for criterion to carry out calculation of transform coefficients matrix;
To minimize encoding rate distortion cost for criterion, the prediction residual corresponding under different demarcation mode according to the described maximum coding unit obtained and transform coefficient matrix, determine the optimum division mode of described maximum coding unit, using the coding dividing mode of described optimum division mode as described maximum coding unit.
Optionally, the full-size of described converter unit is the second size, and described second size is greater than 32*32.
Optionally, the full-size of described predicting unit is the 3rd size, and described 3rd size is greater than 64*64.
Optionally, the quantity of the high-frequency information that described frame of video comprises is greater than default high-frequency information threshold value, and/or the resolution of described frame of video is greater than default resolution.
A kind of video encoding/decoding method, comprising:
Receive code stream to be decoded, described code stream is obtained by maximum encoding unit encodes; Wherein, described maximum coding unit is of a size of first size, and described first size is greater than 64*64;
The decoding parametric corresponding according to described code stream is decoded to described code stream, obtains described maximum coding unit.
Optionally, according to the decoding parametric that described code stream comprises, described code stream is decoded, obtains described maximum coding unit, comprising:
The deep cut flags parameters corresponding according to described code stream obtains the dividing mode described maximum coding unit being divided into coding unit, the predicting unit obtained is divided by each coding unit according to the predicting unit partition mode gain of parameter that described maximum coding unit divides each coding unit obtained, and, obtain according to the division identification parameter of converter unit and divide by each coding unit the converter unit obtained;
Be divided into the dividing mode of coding unit, described predicting unit and described converter unit according to by described maximum coding unit, described code stream is decoded, obtain described maximum coding unit.
Optionally, the full-size of described converter unit is the second size, and described second size is greater than 32*32.
Optionally, the full-size of described predicting unit is the 3rd size, and described 3rd size is greater than 64*64.
A kind of video coding apparatus, comprising:
Processing module, for being handled as follows by each maximum coding unit corresponding for current video frame, wherein, described maximum coding unit is of a size of first size, described first size is greater than 64*64: according to quad-tree structure, and described maximum coding unit is divided into coding unit respectively; To each coding unit obtained according to different demarcation mode, predicted according at least one coding mode by the predicting unit divided by described coding unit, at least obtain the prediction residual that described coding unit is corresponding under described at least one coding mode respectively; To each coding unit obtained according to often kind of dividing mode, the prediction residual corresponding according to this coding unit obtained by converter unit calculates, and obtains the transform coefficient matrix that described coding unit is corresponding; Wherein, described converter unit is divided by described coding unit and obtains, and described converter unit minimizes encoding rate distortion cost for criterion to carry out calculation of transform coefficients matrix;
Determination module, for to minimize encoding rate distortion cost for criterion, the prediction residual corresponding under different demarcation mode according to the described maximum coding unit obtained and transform coefficient matrix, determine the optimum division mode of described maximum coding unit, using the coding dividing mode of described optimum division mode as described maximum coding unit.
Optionally, the full-size of described converter unit is the second size, and described second size is greater than 32*32.
Optionally, the full-size of described predicting unit is the 3rd size, and described 3rd size is greater than 64*64.
Optionally, the quantity of the high-frequency information that described frame of video comprises is greater than default high-frequency information threshold value, and/or the resolution of described frame of video is greater than default resolution.
A kind of video decoder, comprising:
Receiver module, for receiving code stream to be decoded, described code stream is obtained by maximum encoding unit encodes; Wherein, described maximum coding unit is of a size of first size, and described first size is greater than 64*64;
Decoder module, decodes to described code stream for the decoding parametric corresponding according to described code stream, obtains described maximum coding unit.
Optionally, described decoder module specifically for:
The deep cut flags parameters corresponding according to described code stream obtains the dividing mode described maximum coding unit being divided into coding unit, the predicting unit obtained is divided by each coding unit according to the predicting unit partition mode gain of parameter that described maximum coding unit divides each coding unit obtained, and, obtain according to the division identification parameter of converter unit and divide by each coding unit the converter unit obtained;
Be divided into the dividing mode of coding unit, described predicting unit and described converter unit according to by described maximum coding unit, described code stream is decoded, obtain described maximum coding unit.
Optionally, the full-size of described converter unit is the second size, and described second size is greater than 32*32.
Optionally, the full-size of described predicting unit is the 3rd size, and described 3rd size is greater than 64*64.
The embodiment of the present invention provides a kind of method for video coding, the size of maximum coding unit is expanded by 64*64 of the prior art, the size of maximum coding unit is made to be greater than 64*64, like this, when described frame of video is divided, the size of the maximum block that can divide just is greater than 64*64 of the prior art, when encoding to the video with a large amount of duplicate message, just this video can be divided into larger block to encode, more effectively can remove correlation like this, repeating part is put into disposable coding in a block to complete as far as possible, encode respectively without the need to being divided into multiple pieces, improve coding quality.And, because increase the size of maximum coding unit, then when dividing frame of video, the quantity of the block that may mark off will reduce, the quantity also just corresponding minimizing of the syntactic element so used when encoding, such as, when encoding to a bulk, only need use a syntactic element, and when encoding to four fritters, (numeral is here citing just need to use four syntactic elements, do not represent actual quantity), so, the bit number that the final compression coding file obtained uses obviously reduces, the small volume of compression coding file, thus obviously improve compression ratio.
Accompanying drawing explanation
Fig. 1 is the main flow figure of method for video coding in the embodiment of the present invention;
Fig. 2 is the schematic diagram that in the embodiment of the present invention, maximum coding unit is divided into coding unit for the first time;
Fig. 3 is the schematic diagram that in the embodiment of the present invention, maximum coding unit second time is divided into coding unit;
Fig. 4 is the schematic diagram that in the embodiment of the present invention, maximum coding unit is divided into coding unit for the third time;
Fig. 5 is the different demarcation mode schematic diagram in the embodiment of the present invention, coding unit being divided into predicting unit;
Fig. 6 is the main flow figure of coding/decoding method in the embodiment of the present invention;
Fig. 7 is the primary structure block diagram of video coding apparatus in the embodiment of the present invention;
Fig. 8 is the primary structure block diagram of video decoder in the embodiment of the present invention.
Embodiment
The embodiment of the present invention provides a kind of method for video coding, comprise: each maximum coding unit corresponding for current video frame is handled as follows, wherein, described maximum coding unit is of a size of first size, described first size is greater than 64*64: according to quad-tree structure, and described maximum coding unit is divided into coding unit respectively; To each coding unit obtained according to different demarcation mode, predicted according at least one coding mode by the predicting unit divided by described coding unit, at least obtain the prediction residual that described coding unit is corresponding under described at least one coding mode respectively; To each coding unit obtained according to often kind of dividing mode, the prediction residual corresponding according to this coding unit obtained by converter unit calculates, and obtains the transform coefficient matrix that described coding unit is corresponding; Wherein, described converter unit is divided by described coding unit and obtains, and described converter unit minimizes encoding rate distortion cost for criterion to carry out calculation of transform coefficients matrix; To minimize encoding rate distortion cost for criterion, the prediction residual corresponding under different demarcation mode according to the described maximum coding unit obtained and transform coefficient matrix, determine the optimum division mode of described maximum coding unit, using the coding dividing mode of described optimum division mode as described maximum coding unit.
The embodiment of the present invention provides a kind of method for video coding, the size of maximum coding unit is expanded by 64*64 of the prior art, the size of maximum coding unit is made to be greater than 64*64, like this, when described frame of video is divided, the size of the maximum block that can divide just is greater than 64*64 of the prior art, when encoding to the video with a large amount of duplicate message, just this video can be divided into larger block to encode, more effectively can remove correlation like this, repeating part is put into disposable coding in a block to complete as far as possible, encode respectively without the need to being divided into multiple pieces, improve coding quality.And, because increase the size of maximum coding unit, then when dividing frame of video, the quantity of the block that may mark off will reduce, the quantity also just corresponding minimizing of the syntactic element so used when encoding, such as, when encoding to a bulk, only need use a syntactic element, and when encoding to four fritters, (numeral is here citing just need to use four syntactic elements, do not represent actual quantity), so, the bit number that the final compression coding file obtained uses obviously reduces, the small volume of compression coding file, thus obviously improve compression ratio.
For making the object of the embodiment of the present invention, technical scheme and advantage clearly, below in conjunction with the accompanying drawing in the embodiment of the present invention, technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
In addition, term "and/or" herein, being only a kind of incidence relation describing affiliated partner, can there are three kinds of relations in expression, and such as, A and/or B, can represent: individualism A, exists A and B simultaneously, these three kinds of situations of individualism B.In addition, character "/" herein, if no special instructions, general expression forward-backward correlation is to the relation liking a kind of "or".
Below in conjunction with accompanying drawing, the preferred embodiment of the present invention is described in detail.
Refer to Fig. 1, the embodiment of the present invention provides a kind of method for video coding, and the main flow of described method is described below.Be handled as follows by each maximum coding unit at least one corresponding for current video frame maximum coding unit, wherein, described maximum coding unit is of a size of first size, and described first size is greater than 64*64:
Step 101: each maximum coding unit corresponding for current video frame is handled as follows, wherein, described maximum coding unit is of a size of first size, and described first size is greater than 64*64: according to quad-tree structure, and described maximum coding unit is divided into coding unit respectively; To each coding unit obtained according to different demarcation mode, predicted according at least one coding mode by the predicting unit divided by described coding unit, at least obtain the prediction residual that described coding unit is corresponding under described at least one coding mode respectively; To each coding unit obtained according to often kind of dividing mode, the prediction residual corresponding according to this coding unit obtained by converter unit calculates, and obtains the transform coefficient matrix that described coding unit is corresponding; Wherein, described converter unit is divided by described coding unit and obtains, and described converter unit minimizes encoding rate distortion cost for criterion to carry out calculation of transform coefficients matrix;
Step 102: to minimize encoding rate distortion cost for criterion, the prediction residual corresponding under different demarcation mode according to the described maximum coding unit obtained and transform coefficient matrix, determine the optimum division mode of described maximum coding unit, using the coding dividing mode of described optimum division mode as described maximum coding unit.
In the embodiment of the present invention, the quantity of the high-frequency information that described frame of video comprises is greater than default high-frequency information threshold value, and/or the resolution of described frame of video is greater than default resolution.That is, in the embodiment of the present invention, in described frame of video, include a large amount of high-frequency informations, and/or the resolution of described frame of video is higher.Described default resolution is such as 1080P, or also can be other resolution.
For the video including a large amount of high-frequency information, JCT-VC (JointCollaborativeTeamonVideoCoding, Video coding integration and cooperation group) tissue proposes and formulates HEVCSCC (HighEfficiencyVideoforScreenContentCoding, high efficiency Video coding screen content is encoded) plan of standard, to improve to HEVC the compression ratio improving this type of video.But in HEVCSCC, the dividing mode of block has still adopted the dividing mode in HEVC, is obviously unfavorable for the process to this kind of video.
Therefore, for this kind of video including a large amount of high-frequency information, and/or the video that resolution is higher, propose in the embodiment of the present invention, by the size of described maximum coding unit (LCU), 64*64 original again, be increased to described first size, described first size is greater than 64*64, and such as described first size can be 128*128, also can be 256*256, or larger.Like this, to having a large amount of duplicate message, the simple video of texture encode time, just this video can be divided into larger block to encode, more effectively can remove correlation like this, repeating part is put into disposable coding in a block to complete as far as possible, without the need to being divided into multiple pieces to encode respectively, improve coding quality.And, because increase the size of maximum coding unit, then when dividing frame of video, for a same width frame of video, the quantity of the LCU block that may mark off will reduce, the quantity also just corresponding minimizing of the syntactic element so used when encoding, such as, when encoding to a bulk, only need use a syntactic element, and when encoding to four fritters, (numeral is here citing just need to use four syntactic elements, do not represent actual quantity), so, the bit number that the final compression coding file obtained uses obviously reduces, the small volume of compression coding file, thus obviously improve compression ratio.
Certainly, technical scheme in the embodiment of the present invention, not only can be applied in HEVCSCC standard, can also be used in now existing or following be about to occur video encoding and decoding standard in, as long as video encoding and decoding standard for frame of video be the frame of video having a large amount of high-frequency information, or video encoding standard for frame of video be the frame of video that resolution is greater than described default resolution, or video encoding standard for frame of video be have a large amount of high-frequency information, and resolution is greater than the frame of video of described default resolution, the technical scheme of the embodiment of the present invention just can be applied in this video encoding and decoding standard.
In the embodiment of the present invention, when carrying out Video coding, first a frame of video being divided into one or more maximum coding unit, processing for each maximum coding unit wherein afterwards.Wherein, each maximum coding unit can correspond to a code tree unit (CTU), that is, LCU is divided into coding unit (CU), carries out recurrence division according to quad-tree partition mode.
Such as, Fig. 2 represents a LCU first time quad-tree partition.Divide to carry out second time, then see Fig. 3, what such as divide is the unit being numbered 1 and 2 in Fig. 2.Divide to carry out third time, then see Fig. 4, what such as divide is the unit being numbered 5 and 7 in Fig. 3.
Suppose after third time divides, no longer continue to divide downwards, then 0 ~ 15 in Fig. 4 represents each unit, is all called a coding unit.
Each coding unit needs to be divided into predicting unit (PU), dividing mode is identical with the dividing mode in HEVC or HEVCSCC, for no other reason than that the size of maximum coding unit increases to some extent in the embodiment of the present invention, therefore, accordingly, the full-size of predicting unit also increases to some extent, the full-size of such as predicting unit is the 3rd size, described 3rd size is greater than 64*64, and wherein, in prior art, the full-size of PU is 64*64.Such as, if maximum coding unit is of a size of 128*128, then the described maximum 3rd be of a size of 128*128.Coding unit is divided into predicting unit, has eight kinds of dividing mode, as shown in Figure 5.According to different predictive modes, can adopt different dividing mode, wherein, the size of predicting unit is less than or equal to the size of corresponding coding unit.The degree of depth of the M presentation code unit in Fig. 5, if such as described coding unit is of a size of 128*128, then M is 128, if described coding unit is of a size of 64*64, then M is 64.L represents left, and R represents right, and U represents upper, and D represents down.
Each coding unit also needs to be divided into converter unit (TU).The size of TU, 4*4,8*8,16*16 and 32*32 these four kinds is had in prior art, and in the embodiment of the present invention, the size of maximum coding unit increases to some extent, therefore, accordingly, the full-size of converter unit also increases to some extent, the full-size of such as converter unit is the second size, and described second size is greater than 32*32.Such as, if maximum coding unit is of a size of 128*128, then described second be of a size of 64*64.Coding unit is divided into converter unit, and be also adopt quad-tree partition mode, wherein, the size of converter unit is less than or equal to the size of corresponding coding unit.
In the embodiment of the present invention, in the process of Video coding and prior art, in HEVC or HEVCSCC, the process of Video coding is similar, and just the size of maximum coding unit increases to some extent, has had more several dividing mode when dividing.
In the embodiment of the present invention, a maximum coding unit can have different dividing mode, need to select best dividing mode, so with regard to needing, a maximum coding unit is divided according to different dividing mode respectively, and the prediction residual that under calculating often kind of dividing mode, this maximum coding unit is corresponding and transform coefficient matrix, thus can to minimize encoding rate distortion cost for criterion, according to the prediction residual under each dividing mode obtained and transform coefficient matrix, determine the optimum division mode of described maximum coding unit, and using the coding dividing mode of described optimum division mode as described maximum coding unit.It should be noted that under a kind of dividing mode, the quantity of the prediction residual that this maximum coding unit is corresponding may be one also may be multiple, and the quantity of corresponding transform coefficient matrix also may be one or more.
Such as, after obtaining a maximum coding unit, the first dividing mode is exactly do not divide it, using whole for described maximum coding unit as a coding unit.Then this coding unit is divided into predicting unit according to different coding modes respectively, wherein, coding mode can comprise MODE_INTRA pattern and MODE_INTER pattern, in addition, a kind of new coding mode is also add, i.e. MODE_INTRABC in HEVCSCC standard.A coding unit, according to different coding modes, can be divided into different predicting unit.By the predicting unit marked off respectively according to this three kinds of coding modes, according to corresponding coding mode, this coding unit is predicted respectively, so, for often kind of coding mode, at least can obtain at least one prediction residual that this coding unit is corresponding.For a kind of coding mode, if the quantity of the prediction residual obtained is greater than 1, then can first screen under same coding mode, namely a best prediction residual is therefrom selected, so, three kinds of coding modes, can obtain under often kind of coding mode one preferably prediction residual.Or for a kind of coding mode, the quantity of the prediction residual no matter obtained equals 1 or be greater than 1, all directly carries out next step.
In addition, under this dividing mode of maximum coding unit, also this maximum coding unit as coding unit to be divided into converter unit.In the embodiment of the present invention, maximum coding unit is of a size of described first size, and such as described first size is 128*128, then, the converter unit that this maximum coding unit may divide may have 4*4,8*8,16*16,32*32 and 64*64 these five kinds.
Prediction residual under often kind of coding mode to be calculated respectively by corresponding converter unit, obtain corresponding transform coefficient matrix.Such as, for a coding unit, if the prediction residual totally three obtained, the possible size of converter unit has five kinds, then the transform coefficient matrix obtained can have 15 kinds.
Same, also need to adopt the second dividing mode to described maximum coding unit, under this dividing mode, that described maximum coding unit is divided into four coding units, such as described maximum coding unit is of a size of 128*128, then described maximum coding unit is divided four coding units obtained, each coding unit is of a size of 64*64.So, for each coding unit, carry out as above similar process.Here each coding unit is when processing, because it is of a size of 64*64, therefore the same with described maximum coding module, not only can it can be used as a disposed of in its entirety, can also be continued to divide process, until a block to be divided into the coding module of 8*8, then cannot down continue again to divide.
Like this, be to obtain described maximum coding unit prediction residual corresponding respectively under different dividing mode and transform coefficient matrix.When processing the coding unit under different demarcation mode, can serial process, or also can parallel processing.
After obtaining described maximum coding unit prediction residual corresponding respectively under different demarcation mode and transform coefficient matrix, can to minimize encoding rate distortion cost for criterion, using prediction residual and transform coefficient matrix as combination, calculate wherein best combination, dividing mode corresponding to the combination of this best is exactly the optimum division mode of described maximum coding unit, can using the coding dividing mode of this dividing mode as described maximum coding unit, the dividing mode of maximum coding unit mentioned here, comprise the dividing mode maximum coding unit being divided into coding unit, each coding unit is divided into the dividing mode of predicting unit respectively, and each coding unit is divided into the dividing mode of converter unit respectively.Such as Fig. 4 is exactly the schematic diagram being divided the coding unit obtained under a kind of dividing mode of encoding by maximum coding unit.
Refer to Fig. 6, based on same inventive concept, the embodiment of the present invention provides a kind of video encoding/decoding method, and the code stream that described method be may be used for being obtained by Fig. 1 flow process is decoded.The main flow of described method is described below.
Step 601: receive code stream to be decoded, described code stream is obtained by maximum encoding unit encodes; Wherein, described maximum coding unit is of a size of first size, and described first size is greater than 64*64;
Step 602: the decoding parametric corresponding according to described code stream is decoded to described code stream, obtains described maximum coding unit.
Video decode mode in the embodiment of the present invention and the video decode mode in HEVC or HEVCSCC of the prior art similar, just the full-size of the size of maximum coding unit, the full-size of predicting unit and converter unit increases all to some extent.
Optionally, in the embodiment of the present invention, according to the decoding parametric that described code stream comprises, described code stream is decoded, obtains described maximum coding unit, comprising:
The deep cut flags parameters corresponding according to described code stream obtains the dividing mode described maximum coding unit being divided into coding unit, the predicting unit obtained is divided by each coding unit according to the predicting unit partition mode gain of parameter that described maximum coding unit divides each coding unit obtained, and, obtain according to the division identification parameter of converter unit and divide by each coding unit the converter unit obtained;
Be divided into the dividing mode of coding unit, described predicting unit and described converter unit according to by described maximum coding unit, described code stream is decoded, obtain described maximum coding unit.
Concrete, when decoding, the code stream corresponding to maximum coding module can be obtained, to each code stream, by from the syntactic element splitFlag wherein read (deep cut mark), just know how this maximum coding unit is specifically divided into coding unit, by the syntactic element part_mode (partition mode of the predicting unit of coding unit) read, just know each coding unit wherein how to be divided into predicting unit, and pass through from the syntactic element split_transform_flag wherein read (the division mark of converter unit), just know each coding unit wherein how to be divided into converter unit.Just carry out the inverse process of decode procedure afterwards, first carry out inverse transformation by converter unit, obtain prediction residual, then prediction residual is carried out certain operations with corresponding prediction module, obtain coding module.For a code stream, after obtaining all coding modules, just obtain the maximum coding module that this code stream is corresponding.
Optionally, in the embodiment of the present invention, the full-size of described converter unit is the second size, and described second size is greater than 32*32.
Optionally, in the embodiment of the present invention, the full-size of described predicting unit is the 3rd size, and described 3rd size is greater than 64*64.
Wherein, the concrete video coding process in the embodiment of the present invention and video decoding process, with reference to the video coding process in HEVCSCC of the prior art and video decoding process, can just carry out simple description in the present invention.
Refer to Fig. 7, based on same inventive concept, the embodiment of the present invention provides a kind of video coding apparatus, and described device can comprise processing module 701 and determination module 702.
Processing module 701 is for being handled as follows each maximum coding unit corresponding for current video frame, wherein, described maximum coding unit is of a size of first size, and described first size is greater than 64*64: according to quad-tree structure, and described maximum coding unit is divided into coding unit respectively; To each coding unit obtained according to different demarcation mode, predicted according at least one coding mode by the predicting unit divided by described coding unit, at least obtain the prediction residual that described coding unit is corresponding under described at least one coding mode respectively; To each coding unit obtained according to often kind of dividing mode, the prediction residual corresponding according to this coding unit obtained by converter unit calculates, and obtains the transform coefficient matrix that described coding unit is corresponding; Wherein, described converter unit is divided by described coding unit and obtains, and described converter unit minimizes encoding rate distortion cost for criterion to carry out calculation of transform coefficients matrix;
Determination module 702 is for minimize encoding rate distortion cost for criterion, the prediction residual corresponding under different demarcation mode according to the described maximum coding unit obtained and transform coefficient matrix, determine the optimum division mode of described maximum coding unit, using the coding dividing mode of described optimum division mode as described maximum coding unit.
Optionally, in the embodiment of the present invention, the full-size of described converter unit is the second size, and described second size is greater than 32*32.
Optionally, in the embodiment of the present invention, the full-size of described predicting unit is the 3rd size, and described 3rd size is greater than 64*64.
Optionally, in the embodiment of the present invention, the quantity of the high-frequency information that described frame of video comprises is greater than default high-frequency information threshold value, and/or the resolution of described frame of video is greater than default resolution.
Refer to Fig. 8, based on same inventive concept, the embodiment of the present invention provides a kind of video decoder, and described device comprises receiver module 801 and decoder module 802.
Receiver module 801 is for for receiving code stream to be decoded, and described code stream is obtained by maximum encoding unit encodes; Wherein, described maximum coding unit is of a size of first size, and described first size is greater than 64*64;
Decoder module 802 is decoded to described code stream for the decoding parametric corresponding according to described code stream, obtains described maximum coding unit.
Optionally, in the embodiment of the present invention, decoder module 802 specifically for:
The deep cut flags parameters corresponding according to described code stream obtains the dividing mode described maximum coding unit being divided into coding unit, the predicting unit obtained is divided by each coding unit according to the predicting unit partition mode gain of parameter that described maximum coding unit divides each coding unit obtained, and, obtain according to the division identification parameter of converter unit and divide by each coding unit the converter unit obtained;
Be divided into the dividing mode of coding unit, described predicting unit and described converter unit according to by described maximum coding unit, described code stream is decoded, obtain described maximum coding unit.
Optionally, in the embodiment of the present invention, the full-size of described converter unit is the second size, and described second size is greater than 32*32.
Optionally, in the embodiment of the present invention, the full-size of described predicting unit is the 3rd size, and described 3rd size is greater than 64*64.
The embodiment of the present invention provides a kind of method for video coding, comprise: each maximum coding unit corresponding for current video frame is handled as follows, wherein, described maximum coding unit is of a size of first size, described first size is greater than 64*64: according to quad-tree structure, and described maximum coding unit is divided into coding unit respectively; To each coding unit obtained according to different demarcation mode, predicted according at least one coding mode by the predicting unit divided by described coding unit, at least obtain the prediction residual that described coding unit is corresponding under described at least one coding mode respectively; To each coding unit obtained according to often kind of dividing mode, the prediction residual corresponding according to this coding unit obtained by converter unit calculates, and obtains the transform coefficient matrix that described coding unit is corresponding; Wherein, described converter unit is divided by described coding unit and obtains, and described converter unit minimizes encoding rate distortion cost for criterion to carry out calculation of transform coefficients matrix; To minimize encoding rate distortion cost for criterion, the prediction residual corresponding under different demarcation mode according to the described maximum coding unit obtained and transform coefficient matrix, determine the optimum division mode of described maximum coding unit, using the coding dividing mode of described optimum division mode as described maximum coding unit.
The embodiment of the present invention provides a kind of method for video coding, the size of maximum coding unit is expanded by 64*64 of the prior art, the size of maximum coding unit is made to be greater than 64*64, like this, when described frame of video is divided, the size of the maximum block that can divide just is greater than 64*64 of the prior art, when encoding to the video with a large amount of duplicate message, just this video can be divided into larger block to encode, more effectively can remove correlation like this, repeating part is put into disposable coding in a block to complete as far as possible, encode respectively without the need to being divided into multiple pieces, improve coding quality.And, because increase the size of maximum coding unit, then when dividing frame of video, the quantity of the block that may mark off will reduce, the quantity also just corresponding minimizing of the syntactic element so used when encoding, such as, when encoding to a bulk, only need use a syntactic element, and when encoding to four fritters, (numeral is here citing just need to use four syntactic elements, do not represent actual quantity), so, the bit number that the final compression coding file obtained uses obviously reduces, the small volume of compression coding file, thus obviously improve compression ratio.
Those skilled in the art can be well understood to, for convenience and simplicity of description, only be illustrated with the division of above-mentioned each functional module, in practical application, can distribute as required and by above-mentioned functions and be completed by different functional modules, internal structure by device is divided into different functional modules, to complete all or part of function described above.The system of foregoing description, the specific works process of device and unit, with reference to the corresponding process in preceding method embodiment, can not repeat them here.
In several embodiments that the application provides, should be understood that, disclosed system, apparatus and method, can realize by another way.Such as, device embodiment described above is only schematic, such as, the division of described module or unit, be only a kind of logic function to divide, actual can have other dividing mode when realizing, such as multiple unit or assembly can in conjunction with or another system can be integrated into, or some features can be ignored, or do not perform.Another point, shown or discussed coupling each other or direct-coupling or communication connection can be by some interfaces, and the indirect coupling of device or unit or communication connection can be electrical, machinery or other form.
The described unit illustrated as separating component or can may not be and physically separates, and the parts as unit display can be or may not be physical location, namely can be positioned at a place, or also can be distributed in multiple network element.Some or all of unit wherein can be selected according to the actual needs to realize the object of the present embodiment scheme.
In addition, each functional unit in each embodiment of the application can be integrated in a processing unit, also can be that the independent physics of unit exists, also can two or more unit in a unit integrated.Above-mentioned integrated unit both can adopt the form of hardware to realize, and the form of SFU software functional unit also can be adopted to realize.
If described integrated unit using the form of SFU software functional unit realize and as independently production marketing or use time, can be stored in a computer read/write memory medium.Based on such understanding, the part that the technical scheme of the application contributes to prior art in essence in other words or all or part of of this technical scheme can embody with the form of software product, this computer software product is stored in a storage medium, comprising some instructions in order to make a computer equipment (can be personal computer, server, or the network equipment etc.) or processor (processor) perform all or part of step of method described in each embodiment of the application.And aforesaid storage medium comprises: USB flash disk, portable hard drive, read-only memory (Read-OnlyMemory, ROM), random access memory (RandomAccessMemory, RAM), magnetic disc or CD etc. various can be program code stored medium.
Specifically, the computer program instructions that a kind of method for video coding in the embodiment of the present application is corresponding can be stored in CD, hard disk, on the storage mediums such as USB flash disk, when the computer program instructions corresponding with a kind of method for video coding in storage medium is read by an electronic equipment or be performed, comprise the steps:
Each maximum coding unit corresponding for current video frame is handled as follows, wherein, described maximum coding unit is of a size of first size, and described first size is greater than 64*64: according to quad-tree structure, and described maximum coding unit is divided into coding unit respectively; To each coding unit obtained according to different demarcation mode, predicted according at least one coding mode by the predicting unit divided by described coding unit, at least obtain the prediction residual that described coding unit is corresponding under described at least one coding mode respectively; To each coding unit obtained according to often kind of dividing mode, the prediction residual corresponding according to this coding unit obtained by converter unit calculates, and obtains the transform coefficient matrix that described coding unit is corresponding; Wherein, described converter unit is divided by described coding unit and obtains, and described converter unit minimizes encoding rate distortion cost for criterion to carry out calculation of transform coefficients matrix;
To minimize encoding rate distortion cost for criterion, the prediction residual corresponding under different demarcation mode according to the described maximum coding unit obtained and transform coefficient matrix, determine the optimum division mode of described maximum coding unit, using the coding dividing mode of described optimum division mode as described maximum coding unit.
Optionally, the full-size of described converter unit is the second size, and described second size is greater than 32*32.
Optionally, the full-size of described predicting unit is the 3rd size, and described 3rd size is greater than 64*64.
Optionally, the quantity of the high-frequency information that described frame of video comprises is greater than default high-frequency information threshold value, and/or the resolution of described frame of video is greater than default resolution.
The computer program instructions that a kind of video encoding/decoding method in the embodiment of the present application is corresponding can be stored in CD, hard disk, on the storage mediums such as USB flash disk, when the computer program instructions corresponding with a kind of video encoding/decoding method in storage medium is read by an electronic equipment or be performed, comprise the steps:
Receive code stream to be decoded, described code stream is obtained by maximum encoding unit encodes; Wherein, described maximum coding unit is of a size of first size, and described first size is greater than 64*64;
The decoding parametric corresponding according to described code stream is decoded to described code stream, obtains described maximum coding unit.
Optionally, store in described storage medium with step: the depth information corresponding according to described code stream is decoded to described code stream, obtains described maximum coding unit, and corresponding computer instruction, in the process be specifically performed, specifically comprises:
The deep cut flags parameters corresponding according to described code stream obtains the dividing mode described maximum coding unit being divided into coding unit, the predicting unit obtained is divided by each coding unit according to the predicting unit partition mode gain of parameter that described maximum coding unit divides each coding unit obtained, and, obtain according to the division identification parameter of converter unit and divide by each coding unit the converter unit obtained;
Be divided into the dividing mode of coding unit, described predicting unit and described converter unit according to by described maximum coding unit, described code stream is decoded, obtain described maximum coding unit.
Optionally, the full-size of described converter unit is the second size, and described second size is greater than 32*32.
Optionally, the full-size of described predicting unit is the 3rd size, and described 3rd size is greater than 64*64.
The above, above embodiment is only in order to be described in detail the technical scheme of the application, but the explanation of above embodiment just understands method of the present invention and core concept thereof for helping, and should not be construed as limitation of the present invention.Those skilled in the art are in the technical scope that the present invention discloses, and the change that can expect easily or replacement, all should be encompassed within protection scope of the present invention.
Claims (16)
1. a method for video coding, comprising:
Each maximum coding unit corresponding for current video frame is handled as follows, wherein, described maximum coding unit is of a size of first size, and described first size is greater than 64*64: according to quad-tree structure, and described maximum coding unit is divided into coding unit respectively; To each coding unit obtained according to different demarcation mode, predicted according at least one coding mode by the predicting unit divided by described coding unit, at least obtain the prediction residual that described coding unit is corresponding under described at least one coding mode respectively; To each coding unit obtained according to often kind of dividing mode, the prediction residual corresponding according to this coding unit obtained by converter unit calculates, and obtains the transform coefficient matrix that described coding unit is corresponding; Wherein, described converter unit is divided by described coding unit and obtains, and described converter unit minimizes encoding rate distortion cost for criterion to carry out calculation of transform coefficients matrix;
To minimize encoding rate distortion cost for criterion, the prediction residual corresponding under different demarcation mode according to the described maximum coding unit obtained and transform coefficient matrix, determine the optimum division mode of described maximum coding unit, using the coding dividing mode of described optimum division mode as described maximum coding unit.
2. the method for claim 1, is characterized in that, the full-size of described converter unit is the second size, and described second size is greater than 32*32.
3. method as claimed in claim 2, it is characterized in that, the full-size of described predicting unit is the 3rd size, and described 3rd size is greater than 64*64.
4. the method as described in as arbitrary in claim 1-3, it is characterized in that, the quantity of the high-frequency information that described frame of video comprises is greater than default high-frequency information threshold value, and/or the resolution of described frame of video is greater than default resolution.
5. a video encoding/decoding method, comprising:
Receive code stream to be decoded, described code stream is obtained by maximum encoding unit encodes; Wherein, described maximum coding unit is of a size of first size, and described first size is greater than 64*64;
The decoding parametric corresponding according to described code stream is decoded to described code stream, obtains described maximum coding unit.
6. method as claimed in claim 5, is characterized in that, decode according to the decoding parametric that described code stream comprises to described code stream, obtain described maximum coding unit, comprising:
The deep cut flags parameters corresponding according to described code stream obtains the dividing mode described maximum coding unit being divided into coding unit, the predicting unit obtained is divided by each coding unit according to the predicting unit partition mode gain of parameter that described maximum coding unit divides each coding unit obtained, and, obtain according to the division identification parameter of converter unit and divide by each coding unit the converter unit obtained;
Be divided into the dividing mode of coding unit, described predicting unit and described converter unit according to by described maximum coding unit, described code stream is decoded, obtain described maximum coding unit.
7. the method as described in claim 5 or 6, is characterized in that, the full-size of described converter unit is the second size, and described second size is greater than 32*32.
8. method as claimed in claim 7, it is characterized in that, the full-size of described predicting unit is the 3rd size, and described 3rd size is greater than 64*64.
9. a video coding apparatus, comprising:
Processing module, for being handled as follows by each maximum coding unit corresponding for current video frame, wherein, described maximum coding unit is of a size of first size, described first size is greater than 64*64: according to quad-tree structure, and described maximum coding unit is divided into coding unit respectively; To each coding unit obtained according to different demarcation mode, predicted according at least one coding mode by the predicting unit divided by described coding unit, at least obtain the prediction residual that described coding unit is corresponding under described at least one coding mode respectively; To each coding unit obtained according to often kind of dividing mode, the prediction residual corresponding according to this coding unit obtained by converter unit calculates, and obtains the transform coefficient matrix that described coding unit is corresponding; Wherein, described converter unit is divided by described coding unit and obtains, and described converter unit minimizes encoding rate distortion cost for criterion to carry out calculation of transform coefficients matrix;
Determination module, for to minimize encoding rate distortion cost for criterion, the prediction residual corresponding under different demarcation mode according to the described maximum coding unit obtained and transform coefficient matrix, determine the optimum division mode of described maximum coding unit, using the coding dividing mode of described optimum division mode as described maximum coding unit.
10. device as claimed in claim 9, it is characterized in that, the full-size of described converter unit is the second size, and described second size is greater than 32*32.
11. devices as claimed in claim 10, is characterized in that, the full-size of described predicting unit is the 3rd size, and described 3rd size is greater than 64*64.
12. as arbitrary in claim 9-11 as described in device, it is characterized in that, the quantity of the high-frequency information that described frame of video comprises is greater than default high-frequency information threshold value, and/or the resolution of described frame of video is greater than default resolution.
13. 1 kinds of video decoders, comprising:
Receiver module, for receiving code stream to be decoded, described code stream is obtained by maximum encoding unit encodes; Wherein, described maximum coding unit is of a size of first size, and described first size is greater than 64*64;
Decoder module, decodes to described code stream for the decoding parametric corresponding according to described code stream, obtains described maximum coding unit.
14. devices as claimed in claim 13, is characterized in that, described decoder module specifically for:
The deep cut flags parameters corresponding according to described code stream obtains the dividing mode described maximum coding unit being divided into coding unit, the predicting unit obtained is divided by each coding unit according to the predicting unit partition mode gain of parameter that described maximum coding unit divides each coding unit obtained, and, obtain according to the division identification parameter of converter unit and divide by each coding unit the converter unit obtained;
Be divided into the dividing mode of coding unit, described predicting unit and described converter unit according to by described maximum coding unit, described code stream is decoded, obtain described maximum coding unit.
15. devices as described in claim 13 or 14, it is characterized in that, the full-size of described converter unit is the second size, and described second size is greater than 32*32.
16. devices as claimed in claim 15, is characterized in that, the full-size of described predicting unit is the 3rd size, and described 3rd size is greater than 64*64.
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