WO2011124159A1 - Procédé et codeur/décodeur (codec) pour un traitement d'image vidéo - Google Patents

Procédé et codeur/décodeur (codec) pour un traitement d'image vidéo Download PDF

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Publication number
WO2011124159A1
WO2011124159A1 PCT/CN2011/072568 CN2011072568W WO2011124159A1 WO 2011124159 A1 WO2011124159 A1 WO 2011124159A1 CN 2011072568 W CN2011072568 W CN 2011072568W WO 2011124159 A1 WO2011124159 A1 WO 2011124159A1
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Prior art keywords
motion vector
block
candidate motion
current coding
template
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PCT/CN2011/072568
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English (en)
Chinese (zh)
Inventor
王悦
张莉
马思伟
高文
杨名远
周建同
于浩平
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华为技术有限公司
北京大学
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Publication of WO2011124159A1 publication Critical patent/WO2011124159A1/fr

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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
    • H04N19/50—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using predictive coding
    • H04N19/503—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using predictive coding involving temporal prediction
    • H04N19/51—Motion estimation or motion compensation
    • H04N19/56—Motion estimation with initialisation of the vector search, e.g. estimating a good candidate to initiate a search

Definitions

  • the present invention relates to multimedia technologies, and in particular, to a video image processing method and a codec/decoder. Background technique
  • the motion search and compensation technology between frames can effectively remove the temporal redundancy of video content, and the coding efficiency is greatly improved.
  • the motion information is obtained by motion estimation and passed to decoding.
  • the video image is predicted and reconstructed by the decoding end by motion compensation.
  • the proportion of motion residual compensation in the code stream is greatly reduced, and the proportion of motion vector information in the code stream is increasing, how to effectively compress motion information becomes the key to further improve video compression efficiency.
  • the method for obtaining motion information in the prior art includes acquiring motion vectors by template matching; specifically, taking the current coding block as a macro block in a B frame as an example, as shown in FIG. 1, first reconstructing around the current coding block The value constructs a template TM, and then performs search matching in the forward reference frame (Ref ListO ) and the backward reference frame (Ref Listl ) of the block with the same template shape as the template TM to obtain the motion vectors MV0 and MV1 as the current coding block. Sport vector.
  • Ref ListO forward reference frame
  • Ref Listl backward reference frame
  • the motion information obtained by the prior art only considers the similarity between the template around the current coding block and the template in the reference frame. After the search and matching, it often appears to ensure that the template is similar, and the reference block and the current coding block are not guaranteed. Similar, resulting in large errors and low precision, making video image coding less efficient. Summary of the invention
  • Embodiments of the present invention provide a video image processing method, apparatus, and device to improve encoding and decoding efficiency of a video image.
  • Embodiments of the present invention adopt the following technical solutions:
  • a method for obtaining motion information of a video image comprising:
  • At least two associated reference blocks of a current coding block corresponding to each candidate motion vector of the candidate motion vector set of the current coding block; at least two association references of the current coding block corresponding to each of the candidate motion vectors Determining, according to an energy function, an candidate motion vector from the candidate motion vector set, the energy function according to a similarity of the at least two associated reference blocks and a template region of the current coding block and the at least The similarity of the template regions of the two associated reference blocks is obtained; the current encoded block motion vector is determined according to at least the selected candidate motion vector.
  • a method for obtaining motion information of a video image comprising:
  • each of the candidate motion vectors in the candidate motion vector set of the current coding block finding a corresponding at least one first reference block in the first reference frame of each of the candidate motion vectors;
  • the motion vector is temporally extrapolated to obtain a corresponding associated motion vector, and the corresponding at least one second reference block is determined in the second reference frame that is in the same direction of the first reference frame according to the associated motion vector;
  • the first reference block corresponding to the motion vector and the second reference block corresponding to the associated motion type quantity are determined according to an energy function, and an candidate motion vector is selected from the candidate motion vector set, the energy function being according to the at least a similarity between a first reference block and the at least one second reference block and a similarity between a current coding block template region and a template region of the at least one first reference block and the at least one second reference block, respectively;
  • a current encoded block motion vector is determined based on the selected candidate motion vector.
  • a method for obtaining motion information of a video image comprising:
  • each candidate motion vector in the candidate motion vector set of the current coding block finding a corresponding first reference block in the first reference frame of each of the candidate motion vectors; determining each of the candidate motion vectors Corresponding associated motion vector, determining a corresponding candidate second reference block in a second reference frame of the associated motion vector that is opposite to the first reference frame; corresponding to each of the candidate motion vectors a reference block and a second reference block corresponding to the associated motion vector are determined according to an energy function, and an candidate motion vector is selected from the candidate motion vector set, the energy function according to the first reference block and the a similarity between the second reference block and a similarity between the current coded block template region and the template region of the first reference block and the second reference block, respectively; The motion vector and the associated motion vector determine a current coded block motion vector.
  • a codec/decoder for performing any of the above methods for acquiring video image motion vector information.
  • An encoding/decoding system comprising the above-described encoder/decoder, wherein the encoding/decoding system is configured to receive an input signal, send it to the encoder/decoder, and send the encoder/decoder Output, wherein the encoder/decoder is configured to perform a method including acquiring any of the video image motion vector information.
  • the video image processing method and the codec device determine, according to the energy function, each candidate motion vector in the candidate motion vector set of the current coding block, and selects each of the candidate motion vectors.
  • the energy function is obtained according to a similarity of at least two associated reference blocks of the current coding block and a similarity between a template region of a current coding block and a template region of the at least two associated reference blocks, respectively, Determining the current coded block motion vector according to the selected at least one motion vector can effectively reduce the error to improve the codec efficiency of the video image.
  • FIG. 1 is a schematic view of a prior art method
  • FIG. 3 is a flowchart of a method according to Embodiment 2 of the present invention.
  • FIG. 4 is a schematic diagram of an alternative motion vector set according to an embodiment of the present invention.
  • FIG. 5 is a schematic structural diagram 1 of a reference frame according to Embodiment 2 of the present invention.
  • FIG. 7 is a schematic diagram of P frame extrapolation according to an embodiment of the present invention. detailed description
  • Embodiment 1 is a diagrammatic representation of Embodiment 1:
  • the video image processing method provided in this embodiment includes the following steps: 201: Obtain at least two associations of current coding blocks corresponding to each candidate motion vector in the candidate motion vector set of the current coding block. Reference block.
  • the candidate motion vector meter of the current coding block acquiring the coded block according to temporal spatial correlation Sports information is built.
  • the reference block corresponds to an alternate second reference block in the second reference frame, that is, after the symmetry search, the candidate first reference block and its corresponding searched candidate second reference block are current
  • the coding block is symmetric with respect to the center, and the equalization search may be performed without considering the symmetry to determine a set of candidate first reference blocks and a set of candidate second reference blocks, and may also be scaled according to each candidate motion vector.
  • the at least two associated reference blocks include a set of candidate first reference blocks and a set of candidate second reference blocks. Further, in the case of multiple reference frames, a set of candidate third reference blocks may also be determined, A set of alternative fourth reference blocks and more associated reference blocks are determined in the same manner as described above, and other search methods may be employed, requiring the searched associated reference blocks to follow a particular search pattern.
  • the energy function is obtained according to the similarity of the at least two associated reference blocks and the similarity between the template regions of the current coding block and the template regions of the at least two associated reference blocks, respectively.
  • the similarity of the at least two associated reference blocks may be obtained by: calculating the at least two associated parameters by using at least one associated reference block of the current coding block corresponding to one candidate motion vector The similarity between the pixels of the block is tested, wherein the number of pixels of each associated reference block is the same.
  • the similarity between the template region of the current coding block and the template region of the at least two associated reference blocks, respectively, may be obtained by: respectively surrounding at least two associated reference blocks of the current coding block corresponding to one candidate motion vector Obtaining a template area in the coded area, acquiring a template area in the coded area around the current coded block, and calculating a similarity between the template area of the current coded block and the template area of the at least two associated reference blocks, where the at least two The position between the template region of the associated reference block and the corresponding associated reference block and the location between the template region of the current coded block and the current coded block, the shape and size of the template region of the at least two associated reference blocks
  • the template area of the current coding block has the same shape and size. If the at least two associated reference blocks are two associated reference blocks, the similarity of the at least two associated reference blocks, the template region of the current coding block and the template region of the at least two associated reference blocks respectively Degree-weighted superposition to obtain the energy function includes:
  • CostDirect lambdal *COST(MB associa t e i,MB associa t e2 )+lambda2*COST(Template assocmtei, Temp late current ) +lambda3*COST (Template ass . ciate2 , Template c
  • lambdal, lambda2 and lambda3 are weighting coefficients greater than zero
  • COST represents the similarity calculation function
  • MB represents the current coding block
  • template represents the template region
  • associate 1 represents an associated reference block of the current coding block
  • associate2 represents the current coding block. Another associated reference block.
  • the similarities include error sum, absolute error sum (SAD), absolute conversion error and sum of absolute transformation differences or absolute sum of squared differences.
  • SAD absolute error sum
  • SAD absolute error sum
  • sum of absolute transformation differences or absolute sum of squared differences there may be other parameters which can be used to describe the similarity between the two reference blocks.
  • the solutions provided by the present invention are explained by taking the absolute error sum as an example.
  • the motion vectors to obtain said selected candidate motion vector of the current coding block Wo 5 obtained by motion search; end of the encoding candidate motion vector that is selected as the motion vector of the current encoding block
  • the difference between the difference is sent to the decoding end, and the decoding end parses, and then recovers according to the obtained difference value according to the obtained difference value and the candidate motion vector selected in step 201, step 202 and step 203.
  • the motion vector of the current coded block to obtain said selected candidate motion vector of the current coding block Wo 5 obtained by motion search; end of the encoding candidate motion vector that is selected as the motion vector of the current encoding block
  • the difference between the difference is sent to the decoding end, and the decoding end parses, and then recovers according to the obtained difference value according to the obtained difference value and the candidate motion vector selected in step 201, step 202 and step 203.
  • the encoding end uses the selected candidate motion vector and the associated motion vector corresponding to the selected candidate motion vector as the motion vector of the current coding block; or, the selected An alternative motion vector and a difference between the associated motion vector and a motion vector pair obtained by the motion search block of the current coding block, and the difference is sent to the decoding end for obtaining a motion vector of the current coding block.
  • the embodiment further provides a codec for performing a method for acquiring video image motion information, and the encoder obtains each of the candidate motion vector sets of the current coding block. At least two associated reference blocks of the current coded block corresponding to the candidate motion vector, and at least two associated reference blocks of the current coded block corresponding to each of the candidate motion vectors are determined according to an energy function, from the candidate motion
  • the vector set is selected as an alternative motion vector, and the energy function is obtained according to the similarity of the at least two associated reference blocks and the similarity between the template regions of the current coding block and the template regions of the at least two associated reference blocks, respectively.
  • a current encoded block motion vector is determined based on at least the selected candidate motion vector.
  • the encoder provided in this embodiment is used to perform the method of acquiring video image motion information as described in Embodiment 1 above.
  • the embodiment further provides an encoding/decoding system, including the above-mentioned encoder/decoder, the encoding/decoding system receives an input signal, and sends the received input signal into a codec, wherein the encoder/decoder is configured to perform the above method for acquiring video image motion information, and send the output of the encoder/decoder.
  • the method provided by the embodiment of the present invention can adjust the sequence of each step according to actual needs.
  • the method for acquiring video image motion information and the encoder/decoder and the encoding/decoding system provided in this embodiment change the strategy for determining the reference block in determining the reference block, and can reduce the reference while ensuring that the encoding performance is substantially unchanged.
  • the block determines the complexity of the process implementation, thereby improving the process of acquiring motion information in the video image, and improving the encoding and decoding efficiency of the video image.
  • Embodiment 2 :
  • FIG. 3 76 ' the video image processing method according to this embodiment, with The body includes the following steps:
  • the current coding block may be a complete macroblock or a partitioning block of a macroblock, where a complete macroblock is taken as an example;
  • the candidate motion vector set may include: motion vectors MVL, MVU, MVR, MVUL, and MEAN (MVL, ⁇ ! ! ⁇ ! of the peripheral blocks spatially related to the current coding block (Curr_blk). ! ⁇ ⁇
  • the motion vector in the same position block in the forward reference frame / ⁇ (col_MVl, col_MV2, col_MV3, col_MV4 in Fig. 4) and the motion vector of the peripheral block of the same position block (such as MV1, MV2 in Fig. 4) MV12), the motion vector in the same position block in the backward reference frame / n+1 (such as col_MV1', col_MV2', col_MV3', col_MV4 in Fig.
  • MV1', MV2'MV12' in 5 that is, the left block including the current coding block, the upper block, the upper left block, the upper right block, and the left side of the block in the reference frame and the same position as the current coding block
  • Step 302 - step 307 is performed for each of the candidate motion vectors in the candidate motion vector set.
  • the reference frame / w is the first reference frame.
  • the candidate motion vector corresponding to the candidate motion vector and the candidate motion vector is taken as a set of motion vectors.
  • the first reference frame is a forward reference frame
  • the second reference frame is a backward reference frame.
  • the first reference frame may be a backward reference frame
  • the second reference frame may be a forward reference frame.
  • even the first second reference frame is the same reference frame, further, in this embodiment, only
  • the description is performed by two associated reference blocks, which are respectively a first reference block and a second reference block. In practice, it may be a set of first reference blocks and a set of second reference blocks.
  • step 302 and step 303 taking the case of only one B frame between two P frames as an example, the forward and backward motion vectors of the current block to be coded are obtained by an identical search process in both the encoder and the decoder.
  • the search process must ensure that the searched forward and backward motion vector satisfies the hook speed linear model.
  • the search accuracy of the motion vector is 1/4 pixel, and the full search process of the whole pixel -> 1/2 pixel -> 1/4 pixel is used, and the search range is 8 (integral pixel unit).
  • other motion models such as accelerated motion may also be employed, and the acceleration motion model may be as follows:
  • V f -(V b + a) where "is the speed difference.
  • the front/backward motion vectors are obtained in substantially the same way.
  • the difference is the constraint on the anterior/posterior motion vector relationship. If the distance between the current B frame from the first reference frame (forward reference frame) is 7 , and the distance between the second reference frame (forward reference frame) is Tb , then the candidate motion vector sum in the search range The corresponding associated motion vector satisfies:
  • Calculating the similarity by calculating a pixel of the first reference block and the second reference block pixel, and calculating a similarity between the first reference block pixel and the second reference block pixel to satisfy the number of the first reference block pixel and the second reference block pixel The number is the same.
  • TM1 Construct a template TM1 around the current coding block (Curr_blk ) in the current frame/ n by using the reconstruction value and the reference frame prediction value, and construct the template TM11 by using the reconstruction value around the candidate first reference block blkl l.
  • the template TM21 is constructed using the reconstruction values around the second reference block blk21.
  • the first and second reference block template regions are the same as the position between the corresponding first and second reference blocks and the template region of the current coding block and the current coding block, the first, the first
  • the shape and size of the template area of the second reference block are the same as the shape and size of the template area of the current coded block.
  • the similarity of the at least two associated reference blocks may be used, and the template regions of the current coding block and the similarity of the template regions of the at least two associated reference blocks are respectively weighted and superposed to obtain the energy function.
  • the similarity between the coded pixels around the first reference block and the coded pixels around the second reference block the similarity between the template region of the template TM1 of the current coding block and the template region of the template TM11 of the first reference block.
  • the weighting of the template region of the template TM1 of the current coding block and the template region of the template TM21 of the second reference block is weighted and superimposed to obtain an energy function, which can be expressed as follows:
  • CostDirect lambdal 1 *COST(MB forward ,MB backward )+lambdal2 *COST(Template for ward ,Template current )+lambdal3 *CO ST(Template backrward , Template cunrent )
  • lambdal, lambda2 and lambda3 are weighting coefficients greater than zero
  • COST represents the similarity calculation function
  • MB represents the current coding block
  • template represents the template region
  • forward represents the first reference block
  • backward represents the second reference block.
  • the energy function can be expressed as follows:
  • CostDirect lambdal *SAD(MB forward , B bac kd)+lambda2 *SAD(Template forward , Template current ) +lambda3 *SAD(Template backrwar d, Template
  • this embodiment also provides an encoding/decoding. And a method for performing acquisition of video image motion information to encode and decode the current coding block.
  • the embodiment further provides an encoding/decoding system, including the above-mentioned encoder/decoder, the encoding/decoding system receives an input signal, and sends the received input signal into And an encoder/decoder for performing the above method for acquiring video image motion information, and transmitting the output of the encoder/decoder.
  • Embodiment 3 is a diagrammatic representation of Embodiment 3
  • the video image processing method provided in this embodiment includes the following steps:
  • the current coding block may be a complete macroblock or a partitioning block of a macroblock, where a complete macroblock is taken as an example;
  • the candidate motion vector set may include: motion vectors MVL, MVU, MVR, MVUL, and MEAN (MVL, MVU, MVR) of the peripheral block spatially related to the current coding block (Curr_blk), forward reference frame / w
  • the motion vector in the same position block such as col_MV1, col_MV2, col_MV3, col_MV4 in Figure 5
  • the motion vector of the peripheral block of the same position block such as MV1, MV2 MV12 in Figure 4
  • backward reference frame / n The motion vector in the same position block in +1 (such as col_MV1', col_MV2', col_MV3', col_MV4 in Figure 4) and the motion vector of the peripheral block of the same position block (such as MV1', MV2' MV12 in Figure 4) All or part of '), including the left block of the current coding block, the upper block, the upper left block, the upper right block, the left block of the block in the same position as the
  • Step 602-step 607 is performed for each of the candidate motion vectors in the candidate motion vector set.
  • the motion model used in this embodiment may linearly move the object at a uniform speed, as shown in FIG. 7, where Fn is the current frame.
  • 3 ⁇ 4 is the current block to be coded
  • Bn_i and ⁇ are 3 ⁇ 4 reference blocks found in the first reference frame of F n according to the candidate motion vector
  • ⁇ ⁇ — 2 and ⁇ ⁇ — 2 ' are ⁇ ⁇ according to the candidate motion vector V
  • the reference block found in the second reference frame F n _ 2 that is further away from F n , ⁇ ⁇ _ 2 and ⁇ ⁇ _ 2 , with respect to the motion vector of ⁇ ⁇ , where the relationship between ' and F n — 2 and the distance from F n and the correlation with the motion model. If the hook speed linear motion model is used and the reference frame closest to the distance ⁇ is the second closest reference frame to the distance F n , V 2 V f .
  • the embodiment can also adopt other motion models such as acceleration motion, and the acceleration motion model is as follows:
  • each pair of motion vectors in the search range should satisfy the following relationship:
  • V f / T f V f ' / T f ' , where / is the candidate motion vector, / ' is the extrapolation motion vector, ⁇ is the distance between the encoding frame of the current coding block and the first reference frame, ⁇ ' is the distance between the encoded frame in which the current coding block is located and the second reference frame.
  • Calculating the similarity by calculating the pixel of the first reference block and the second reference block pixel, and calculating a similarity between the first reference block pixel and the second reference block pixel to satisfy the number of pixels around the first reference block and the second reference
  • the number of pixels in the block is the same.
  • the measurement constructs a template TM1, which is constructed around the candidate first reference block blkl2 using the reconstruction value TM11, and the template TM21 is constructed using the reconstruction values around the alternative second reference block blk22.
  • the first and second reference block template regions are the same as the position between the corresponding first and second reference blocks and the template region of the current coding block and the current coding block, the first, the first
  • the shape and size of the template area of the second reference block are the same as the shape and size of the template area of the current coded block.
  • the energy function is used.
  • the error and the similarity are used, and the similarity between the coded pixels around the first reference block and the coded pixels around the second reference block is calculated, and the template of the current coded block TM1 is used.
  • the similarity between the template region and the template region of the template TM11 of the first reference block, the similarity between the template region of the template TM1 of the current coding block and the template region of the template TM21 of the second reference block are weighted and superimposed to obtain an energy function, which may be as follows Indicates:
  • CostDirect lambdal *COST(MBfon V ard, Bfon V ard)+lambda2*COST(Templatefo r war d, Template current ) +lambda3*COST (Template forward ' , Template
  • lambdal, lambda2 and lambda3 are weighting coefficients greater than or equal to zero
  • COST represents the similarity calculation function
  • MB represents the current coding block
  • template represents the template region
  • forward represents the first reference block
  • forward represents the second reference block.
  • the energy function can be expressed as follows:
  • CostDirect lambdal *SAD(MB forward , MB forward )+lambda2 * S AD(Templatef orW ard, Template current ) +lambda3*SAD (Template forward ' , Tem late cimrent )c
  • this embodiment also provides an encoding/decoding And a method for performing acquisition of video image motion information to encode and decode the current coding block.
  • the embodiment further provides an encoding/decoding system, including the above-mentioned encoder/decoder, the encoding/decoding system receives an input signal, and sends the received input signal into And an encoder/decoder for performing the above method for acquiring video image motion information, and transmitting the output of the encoder/decoder.
  • the steps of a method or algorithm described in connection with the embodiments disclosed herein may be implemented in hardware, a software module executed by a processor, or a combination of both.
  • the software module can be placed in random access memory (RAM memory, read only memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disk, removable disk, CD-ROM, or the art. Any other form of storage medium.

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Abstract

La présente invention porte sur un procédé, un appareil et un équipement pour un traitement d'image vidéo. Le procédé peut diminuer efficacement des erreurs pour augmenter le rendement de codage et de décodage des images vidéo au moyen des étapes suivantes : la détermination d'au moins deux blocs de référence associés du bloc de codage courant correspondant à chacun des vecteurs de mouvement candidats dans l'ensemble de vecteurs de mouvement candidats du bloc de codage courant selon la fonction d'énergie, la sélection d'un vecteur de mouvement candidat à partir de l'ensemble de vecteurs de mouvement candidats, la fonction d'énergie étant obtenue selon la similitude entre les au moins deux blocs de référence associés du bloc de codage courant et la similitude entre la zone de modèle du bloc de codage courant et les zones de modèle des au moins deux blocs de référence associés respectivement, et la détermination du vecteur de mouvement du bloc de codage courant selon le vecteur de mouvement candidat sélectionné.
PCT/CN2011/072568 2010-04-09 2011-04-09 Procédé et codeur/décodeur (codec) pour un traitement d'image vidéo WO2011124159A1 (fr)

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