WO2023273802A1 - 解码方法、编码方法、装置、设备及存储介质 - Google Patents
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Definitions
- the present application relates to video codec technology, and in particular to a decoding method, encoding method, device, equipment and machine-readable storage medium.
- Complete video coding generally includes operations such as prediction, transformation, quantization, entropy coding, and filtering.
- Prediction can be divided into intra-frame prediction and inter-frame prediction.
- Intra-frame prediction uses the surrounding coded units as a reference to predict the current uncoded unit, effectively removing redundancy in the spatial domain.
- Inter-frame prediction is to predict the current image using adjacent coded images, effectively removing redundancy in the time domain.
- the present application provides a decoding method, an encoding method, a device, a device, and a machine-readable storage medium.
- a decoding method including: receiving a code stream, analyzing the motion information index value of the skip mode or direct mode of the current coding unit; constructing a skip mode or direct mode candidate list; Determine the prediction mode of the current coding unit according to the skip mode or the motion information index value of the direct mode and the candidate list of the current coding unit; obtain the motion information of the current coding unit according to the prediction mode of the current coding unit, and perform motion compensation on the current coding unit;
- the parsing the motion information index value of the skip mode or the direct mode of the current coding unit includes: acquiring the number of motion vector angle prediction candidate motion information and the number of inter frame prediction candidate historical motion information; according to the motion vector angle The number of prediction candidate motion information and the number of inter prediction candidate historical motion information determine the motion information index value of the skip mode or direct mode of the current coding unit.
- an encoding method including: constructing a candidate list of skip mode or direct mode: traversing each prediction mode in the prediction mode candidate list in order, and for each prediction mode , obtain the motion information of the current coding unit and the motion information index value of the skip mode or the direct mode of the current coding unit; perform motion compensation on the current coding unit according to the motion information of the current coding unit; calculate the rate-distortion generation corresponding to the prediction mode Value, and compare the rate-distortion cost value with the cost values of other candidate prediction modes, select the prediction mode corresponding to the smallest rate-distortion cost value; skip the current coding unit corresponding to the prediction mode with the smallest rate-distortion cost value
- the motion information index value of the mode or direct mode is carried into the code stream and sent to the decoding end; wherein, the motion information index value of the skip mode or direct mode of the current coding unit corresponding to the prediction mode with the smallest rate-distortion cost value
- a decoding device including: a decoding module, configured to receive a code stream, and analyze the motion information index value of the skip mode or direct mode of the current coding unit; a construction module, configured to construct The candidate list of the skip mode or the direct mode; the determination module is used to determine the prediction mode of the current coding unit according to the motion information index value and the candidate list of the skip mode or the direct mode of the current coding unit; the compensation module is used to determine the prediction mode according to the current coding unit The prediction mode of the unit acquires the motion information of the current coding unit, and performs motion compensation on the current coding unit; wherein, the decoding module is specifically used to obtain the number of motion vector angle prediction candidate motion information and the number of inter-frame prediction candidate historical motion information ; Determine the motion information index value of the skip mode or direct mode of the current coding unit according to the number of motion information candidates for motion vector angle prediction and the number of historical motion information candidates for inter prediction.
- an encoding device including: a construction module, configured to construct a candidate list of skip mode or direct mode: traverse each prediction mode in the prediction mode candidate list in order, for For each prediction mode, obtain the motion information of the current coding unit and the motion information index value of the skip mode or direct mode of the current coding unit; the compensation module is used to perform motion compensation on the current coding unit according to the motion information of the current coding unit ; A determination module, used to calculate the rate-distortion cost value corresponding to the prediction mode, and compare the rate-distortion cost value with the cost values of other candidate prediction modes, and select the prediction mode corresponding to the smallest rate-distortion cost value; the encoding module , used to carry the motion information index value of the skip mode or direct mode of the current coding unit corresponding to the prediction mode with the smallest rate-distortion cost value into the code stream, and transmit it to the decoding end; wherein, the encoding module
- a decoding end device including a processor and a machine-readable storage medium, where the machine-readable storage medium stores machine-executable instructions that can be executed by the processor, so The aforementioned processor is configured to execute machine-executable instructions, so as to implement the decoding method provided in the first aspect.
- an encoding device including a processor and a machine-readable storage medium, where the machine-readable storage medium stores machine-executable instructions that can be executed by the processor, so The above-mentioned processor is used to execute machine-executable instructions, so as to realize the encoding method provided by the second aspect.
- a machine-readable storage medium stores machine-executable instructions, and when the machine-executable instructions are executed by a processor, the first aspect Or the method described in the second aspect.
- the encoding method of the embodiment of the present application by receiving the code stream, analyzing the motion information index value of the skip mode or direct mode of the current coding unit, constructing a candidate list of skip mode or direct mode, according to the skip mode or direct mode of the current coding unit
- the motion information index value of the direct mode and the candidate list determine the prediction mode of the current coding unit, and obtain the motion information of the current coding unit according to the prediction mode of the current coding unit, perform motion compensation on the current coding unit, and analyze the skipping of the current coding unit
- the motion information index value of mode or direct mode is obtained, the number of candidate motion information and the number of inter-prediction candidate history motion information are obtained by obtaining the motion vector angle, and the number of candidate motion information and the inter-frame prediction candidate history are predicted according to the motion vector angle
- the number of motion information determines the motion information index value of the skip mode or direct mode of the current coding unit, which improves the flexibility of determining the motion information index value of the skip mode or direct mode, and improves
- Figure 1a and Figure 1b are schematic diagrams of a codec method shown in an exemplary embodiment of the present application
- FIG. 2 is a block diagram of a SBTMVP mode shown in an exemplary embodiment of the present application
- Fig. 3 is a schematic diagram of the positions of neighboring blocks in the spatial domain of a Skip and Direct mode shown in an exemplary embodiment of the present application;
- Fig. 4 is a schematic diagram of the corresponding relationship between a mode index and a mode in an MVAP mode shown in an exemplary embodiment of the present application;
- Fig. 5 is a schematic diagram showing the position of a motion vector angle prediction sample according to an exemplary embodiment of the present application
- Fig. 6 is a decoding flowchart of an HMVP method shown in an exemplary embodiment of the present application
- Fig. 7 is a schematic flowchart of a decoding method shown in an exemplary embodiment of the present application.
- Fig. 8 is a schematic flowchart of another decoding method shown in an exemplary embodiment of the present application.
- Fig. 9 is a schematic flowchart of an encoding method shown in an exemplary embodiment of the present application.
- Fig. 10 is a schematic flowchart of another encoding method shown in an exemplary embodiment of the present application.
- Fig. 11 is a schematic structural diagram of a decoding device shown in an exemplary embodiment of the present application.
- Fig. 12 is a schematic structural diagram of an encoding device shown in an exemplary embodiment of the present application.
- FIG. 13 is a schematic diagram of a hardware structure of a decoder device shown in an exemplary embodiment of the present application.
- Fig. 14 is a schematic diagram of a hardware structure of an encoding end device shown in an exemplary embodiment of the present application.
- Inter prediction refers to the use of video temporal correlation. Since video sequences usually contain strong temporal correlation, using adjacent encoded image pixels to predict the pixels of the current image can be The purpose of effectively removing video temporal redundancy is achieved.
- Prediction Signal Refers to the pixel value derived from the encoded and decoded pixels.
- the residual is obtained by the difference between the original pixel and the predicted pixel, and then the residual is transformed and quantized and the coefficient is encoded.
- inter-frame predicted pixels refer to pixel values derived from a reference frame (reconstructed pixel frame) of the current image block. Since pixel positions are discrete, interpolation operations are required to obtain final predicted pixels. The closer the predicted pixel is to the original pixel, the smaller the residual energy obtained by subtracting the two, and the higher the coding compression performance.
- Motion Vector In inter-frame coding, MV is used to represent the relative displacement between the current coding block and the best matching block in the reference image. Each divided block (may be referred to as a sub-block) has a corresponding motion vector that needs to be transmitted to the decoding end. If the MV of each sub-block is independently encoded and transmitted, especially when divided into small-sized sub-blocks, quite a lot of bits will be consumed. In order to reduce the number of bits used to encode MV, the spatial correlation between adjacent image blocks is used in video encoding, and the MV of the current block to be encoded is predicted according to the MV of the adjacent encoded block, and then the prediction difference is encoded. . This can effectively reduce the number of bits representing the MV.
- the MV of the adjacent encoded block is generally used to predict the MV of the current image block, and then the MV prediction value (Motion Vector Prediction, referred to as MVP) and the true motion vector
- MVP Motion Vector Prediction
- Motion Information Since MV represents the relative displacement between the current image block and the best matching block in a reference image, in order to accurately obtain the information pointing to the image block, in addition to the MV information, it is also necessary to pass the reference image
- the index information to indicate which reference image is used For the current image, a reference image list is usually established based on certain principles, and the reference image index information indicates which reference image in the reference image list is used for the current image block.
- many encoding technologies also support multiple reference picture lists, so an index value is needed to indicate which reference picture list is used, and the index value may be called a reference direction.
- coding information related to motion such as MV, reference frame index, and reference direction, is collectively referred to as motion information.
- Skip mode is a skip mode in inter-frame prediction. It does not need to transmit residual information or MVD. It only needs to transmit the index of motion information.
- the decoding end passes The motion information of the coding unit can be derived by analyzing the index, and the predicted value can be directly used as the reconstruction value after obtaining the motion information.
- Direct (Direct) mode is a direct mode in inter-frame prediction. It needs to transmit residual information, but does not need to transmit MVD. It only needs to transmit the index of motion information.
- the decoding end parses the index. The motion information of the coding unit can be derived, and after the motion information is obtained, the predicted value is added to the residual value to obtain the reconstructed value.
- Binarization and anti-binarization method of truncated unary code the relationship between synElVal and binary symbol string can be as shown in Table 1:
- the encoding end can look up Table 1 from maxVal and the value synElVal to be encoded to obtain the binary symbol string to be encoded, and the decoding end can uniquely obtain the value of synElVal from the binary symbol string and maxVal according to Table 1.
- Rate-Distortion Optimized The indicators for evaluating coding efficiency include: code rate and peak signal-to-noise ratio (Peak Signal to Noise Ratio, PSNR). The smaller the code rate, the greater the compression rate; the greater the PSNR, the better the quality of the reconstructed image. In mode selection, the discriminant formula is essentially a comprehensive evaluation of the two.
- D distortion (Distortion), which is usually measured by SSE (difference mean square sum) index
- SSE refers to the difference mean square sum between the reconstruction block and the source image block
- ⁇ is the Lagrangian multiplier
- R is The actual number of bits required for image block encoding in this mode, including the sum of bits required for encoding mode information, motion information, residuals, etc.
- video coding generally includes processes such as prediction, transformation, quantization, and entropy coding. Further, the coding process can also be implemented according to the framework of FIG. 1b.
- Intra-frame prediction is to use the surrounding coded blocks as a reference to predict the current uncoded block, effectively removing redundancy in the spatial domain.
- Inter-frame prediction is to predict the current image using adjacent coded images, effectively removing redundancy in the time domain.
- Transformation refers to transforming an image from the spatial domain to the transform domain, and using transform coefficients to represent the image.
- the vast majority of images contain more flat areas and slowly changing areas.
- Appropriate transformation can transform the image from a scattered distribution in the spatial domain to a relatively concentrated distribution in the transformed domain, remove the frequency domain correlation between signals, and cooperate with The quantization process can effectively compress the code stream.
- Entropy coding is a lossless coding method that can convert a series of element symbols into a binary code stream for transmission or storage.
- the input symbols may include quantized transformation coefficients, motion vector information, prediction mode information, and transformation and quantization related information. Grammar etc. Entropy coding can effectively remove the redundancy of video element symbols.
- video decoding usually includes processes such as entropy decoding, prediction, inverse quantization, inverse transformation, and filtering.
- processes such as entropy decoding, prediction, inverse quantization, inverse transformation, and filtering.
- the implementation principles of each process are the same as entropy encoding or resemblance.
- Temporal Motion Vector Prediction Temporal Motion Vector Prediction
- SBTMVP Sub-Block Temporal Motion Vector Prediction
- MHBSKIP Motion Vector Angle Prediction
- MVAP Motion Vector Angle Prediction
- HMVP History-based Motion Vector Prediction
- ETMVP Enhanced Temporal Motion Vector Prediction
- TMVP and SBTMVP technologies have been adopted into the standard at present. If the width and height of the current block are both greater than or equal to 16, the temporal motion information of the current block is motion information generated by SBTMVP; otherwise, the temporal motion information of the current block is motion information generated by TMVP.
- TMVP first find the motion information in the same position as the preset position of the current coding unit in the time domain reference frame, and then use it as the time domain motion information of the current block after scaling.
- the time domain reference frame is the first frame of list0
- the temporal reference frame is the first frame of list1.
- SBTMVP Let the size of the current block be 2Mx2N, the schematic diagram can be shown in Figure 2, first find the area in the time domain reference frame that is at the same position as the current coding unit, and then divide the area into 4 sub-blocks with a size of MxN, and obtain The motion information of the corresponding position of each sub-block in the time-domain reference frame is scaled as the motion information of the sub-block corresponding to the current block, and finally the motion information of each sub-block is subjected to motion compensation to obtain a prediction value.
- MHBSKIP is a prediction mode in Skip and Direct modes in AVS, which uses the motion information of the spatial adjacent blocks of the current coding unit to predict the motion information of the current coding unit.
- the MHBSKIP mode constructs two-way, backward and forward motion information through the spatial adjacent blocks of the current coding unit to predict the current coding unit.
- the positions of adjacent blocks in the air space in the Skip and Direct modes may be as shown in FIG. 3 .
- the MVAP technology has been adopted into the standard.
- the MVAP technology is to divide the current coding unit into sub-blocks, and then use up to 5 kinds of prediction angles to copy the motion information of each sub-block from the adjacent blocks in the surrounding space according to the preset angle. . In this way, more motion information can be provided for the current coding unit without dividing the coding unit, thereby improving the coding performance.
- the corresponding relationship between the schema index and the schema can be referred to Table 2 and FIG. 4 respectively.
- W and H be the width and height of the current decoding unit
- m and n be W/4 and H/4 respectively
- (x, y) be the pixel coordinates of the upper left corner of the current decoding unit.
- A0, A1,..., Am-1 is the 4 ⁇ 4 block at the lower left corner of the current block
- Am, Am+1,..., Am+n-1 is the 4 ⁇ 4 block at the left side of the current block
- Am+n It is the 4 ⁇ 4 block where the upper left corner of the current block is located, Am+n+1, Am+n+2, ...
- A2m+n is the 4 ⁇ 4 block where the upper left corner of the current block is located, A2m+n+1, A2m+ n+1,..., A2m+2n is the 4 ⁇ 4 block where the upper right corner of the current block is located.
- a schematic diagram of positions of motion vector angle prediction samples may be as shown in FIG. 5 .
- the coordinates of Ai are (x-1, y+H+W-4 ⁇ i-1); if the value range of i is m+ n+1 ⁇ 2m+2n, the coordinates of Ai are (x+4 ⁇ i-W-H-1, y-1) respectively.
- W is less than 8, or H is less than 8, or both W and H are equal to 8.
- neighborMotions[i] be the i-th motion information (interPredRefMode, mvE0, mvE1, refIndexL0, refIndexL1) in the reference motion information list, where the value range of i is 0 ⁇ 2m+2n.
- neighborMotions[i] is equal to neighborMotions[i-1].
- the motion vector prediction method based on historical information is a technology adopted in the new generation video coding standard AVS3, and its principle is to use the motion information of the previous coding block to predict the motion information of the current coding unit.
- AVS3 new generation video coding standard
- its principle is to use the motion information of the previous coding block to predict the motion information of the current coding unit.
- the decoding flowchart of the HMVP method may be as shown in FIG. 6 .
- the ETMVP technology has been adopted into the standard.
- the candidate needs to be checked for duplicates, and then put into the candidate motion vector list, among which for the P image , the time domain reference frame is the first frame of list0, and for the B picture, the time domain reference frame is the first frame of list1.
- motion compensation is performed on the motion information of each candidate 8x8 sub-block in the list to obtain a prediction value.
- the list construction order of skip/direct mode is: time domain+MHBSKIP+MVAP+HMVP, that is, the candidate list of skip/direct mode is constructed in the order of time domain, MHBSKIP, MVAP and HMVP.
- 1 candidate motion information will be generated in the time domain
- 1 candidate motion information will be generated by MHBSKIP
- 8 candidate motion information will be generated by MVAP and HMVP
- the current image is a B image
- 1 candidate motion information will be generated in the time domain
- 3 candidate motion information will be generated by MHBSKIP
- 8 candidate motion information will be generated by MVAP and HMVP
- MVAP and HMVP generate a total of 8 candidate motion information.
- MVAP generates ValidMvapModeNum candidate motion information
- HMVP generates the remaining 8-ValidMvapModeNum candidate motion information.
- ValidMvapModeNum ranges from 0 to 5.
- the motion information index value cu_subtype_index of the skip mode or direct mode of the current coding unit for identification.
- the value range of cu_subtype_index is 0 to 11
- the truncated unary code is used for binary coding
- maxVal is equal to 11.
- the optimization scheme in this embodiment of the present application may include some or all of the following:
- the motion information index value cu_subtype_index of the skip mode or the direct mode of the current coding unit is parsed according to the frame type of the current image and NumOfMvapCand and NumOfHmvpCand.
- ValidMvapModeNum determines whether the current coding unit type is MVAP mode or HMVP mode according to cu_subtype_index and ValidMvapModeNum.
- FIG. 7 is a schematic flowchart of a decoding method provided in an embodiment of the present application, wherein the decoding method may be applied to a decoding end device.
- the decoding method may include the following steps:
- Step S700 receiving the code stream, and analyzing the motion information index value of the skip mode or the direct mode of the current coding unit.
- Step S710 constructing a candidate list of skip mode or direct mode.
- Step S720 Determine the prediction mode of the current coding unit according to the motion information index value of the skip mode or the direct mode of the current coding unit and the candidate list.
- Step S730 Obtain motion information of the current coding unit according to the prediction mode of the current coding unit, and perform motion compensation on the current coding unit.
- step S700 parsing the skip mode of the current coding unit or the motion information index value of the direct mode can be realized by the following steps:
- Step S701. Acquire the number of candidate motion information for motion vector angle prediction and the number of historical motion information for inter-frame prediction candidates.
- Step S702 Determine the motion information index value of the skip mode or direct mode of the current coding unit according to the number of motion vector angle prediction candidate motion information and the number of inter prediction candidate historical motion information.
- the maximum index value (ie maxVal) is no longer fixed at 11, but the number of candidate motion information and the number of candidate historical motion information for inter-frame prediction can be predicted according to the motion vector angle The number is determined.
- the decoding end device when the decoding end device receives the code stream, it can acquire the number of motion vector angle prediction candidate motion information (namely NumOfMvapCand) and the number of inter prediction candidate historical motion information (namely NumOfHmvpCand).
- the number of motion vector angle prediction candidate motion information namely NumOfMvapCand
- the number of inter prediction candidate historical motion information namely NumOfHmvpCand
- the decoding end device may obtain the number of motion vector angle prediction candidate motion information and the number of inter frame prediction candidate historical motion information by parsing the sequence-level high-level syntax.
- the decoder When the decoder acquires the number of motion vector angle prediction candidate motion information and the number of inter-frame prediction candidate historical motion information, it can predict the number of candidate motion information and the number of inter-frame prediction candidate historical motion information according to the acquired motion vector angle.
- a motion information index value of a skip mode or a direct mode of a current coding unit is determined.
- the acquisition of the number of candidate motion information of the motion vector angle prediction and the number of historical motion information of the inter-frame prediction candidates by parsing the sequence-level high-level syntax above may include: parsing the enhanced temporal motion vector prediction and motion Vector angle prediction allowed flag, according to the value of enhanced temporal motion vector prediction and motion vector angle prediction allowed flag, determine the number of candidate motion information of motion vector angle prediction; The value of the inter-prediction candidate historical motion information number index determines the inter-frame prediction candidate historical motion information number.
- sequence-level high-level syntax can be used to determine the motion vector angle prediction candidate by using the enhanced time-domain motion vector prediction and motion vector angle prediction enable flag (etmvp_mvap_enable_flag) and inter-frame prediction candidate history motion information number index (num_of_hmvp_cand) respectively The number of motion information and the number of historical motion information of candidates for inter-frame prediction.
- etmvp_mvap_enable_flag inter-frame prediction candidate history motion information number index
- number_of_hmvp_cand inter-frame prediction candidate history motion information number index
- the enhanced time-domain motion vector prediction and motion vector angle prediction enable flags are used to indicate that the enhanced time-domain motion vector prediction mode and the motion vector angle prediction mode are turned on at the same time, or that the enhanced time-domain motion vector prediction mode and the motion vector prediction mode are turned off at the same time Angle prediction mode.
- the value range of etmvp_mvap_enable_flag is 0-1, and the value range of num_of_hmvp_cand is 0-8.
- the decoder device may determine NumOfMvapCand by analyzing the value of etmvp_mvap_enable_flag; and determine NumOfHmvpCand by analyzing the value of num_of_hmvp_cand.
- the decoder device can determine NumOfMvapCand in the following manner according to the value of etmvp_mvap_enable_flag:
- the value of the enhanced time domain motion vector prediction and motion vector angle prediction permission flag is 1, it is determined that the number of candidate motion information for the motion vector angle prediction is 5; wherein, the enhanced time domain motion vector prediction and motion vector angle prediction
- the value of the allow flag is 1, indicating that the current coding unit can use enhanced temporal motion vector prediction and motion vector angle prediction, that is, the current coding unit enables enhanced temporal motion vector prediction and motion vector angle prediction at the same time.
- the value of the enhanced time-domain motion vector prediction and motion vector angle prediction permission flag determines that the number of candidate motion information for motion vector angle prediction is 0; wherein, the value of the enhanced time-domain motion vector prediction and motion vector angle prediction permission flag is The value is 0, or the enhanced temporal motion vector prediction and motion vector angle prediction enable flag does not exist in the code stream, indicating that the current coding unit should not use enhanced temporal motion vector prediction and motion vector angle prediction, that is, the current coding unit Enhanced temporal motion vector prediction and motion vector angle prediction are not enabled at the same time.
- the decoding end device may use the value of num_of_hmvp_cand as NumOfHmvpCand.
- determining the motion information index value of the skip mode or the direct mode of the current coding unit according to the number of motion vector angle prediction candidate motion information and the number of inter-frame prediction candidate historical motion information may include: according to the motion vector Determine the maximum index value based on the number of angle prediction candidate motion information and the number of inter-frame prediction candidate historical motion information; according to the maximum index value, use the debinarization method of truncated unary code to analyze the skip mode or direct mode of the current coding unit Motion information index value.
- the decoding device can determine the maximum index value (ie maxVal) according to the determined NumOfMvapCand and NumOfHmvpCand, and use the debinarization of truncated unary codes according to the maxVal way to parse the motion information index value of the skip mode or direct mode of the current coding unit.
- the maxVal determined according to the determined NumOfMvapCand and NumOfHmvpCand is less than or equal to 11.
- determining the maximum index value according to the number of motion vector angle prediction candidate motion information and the number of inter-frame prediction candidate history motion information may include: determining the number of motion vector angle prediction candidate motion information and the inter-frame prediction candidate history The maximum value of the number of motion information; the sum of the maximum value and 3 is determined as the maximum index value.
- the maximum number of candidate motion information in the time domain and MHBSKIP candidate motion information is 4, and the value of maxVal is the list length - 1, therefore, the maximum value of NumOfMvapCand and NumOfHmvpCand, and both of 3 The sum determines maxVal.
- the decoding device can determine maxVal in the following manner:
- maxVal ⁇ 11 determined according to the above method, according to the maxVal, when the motion information index value of the skip mode or the direct mode is coded by using the binarization method of truncating the unary code,
- step S702 according to the number of candidate motion information for motion vector angle prediction and the number of historical motion information for inter prediction candidates, determine the motion information index value of the skip mode or direct mode of the current coding unit, which may include : According to the number of motion vector angle prediction candidate motion information, the number of inter-frame prediction candidate historical motion information, and the frame type of the current image, determine the motion information index value of the skip mode or direct mode of the current coding unit.
- the frame type can also be considered, that is, the decoding end device can be based on the motion vector angle
- the number of prediction candidate motion information and the number of inter-frame prediction candidate historical motion information, as well as the frame type of the current image determine the motion information index value of the skip mode or direct mode of the current coding unit.
- determine the motion information index value of the skip mode or direct mode of the current coding unit may include: according to the number of motion vector angle prediction candidate motion information and the number of inter-frame prediction candidate historical motion information, as well as the frame type of the current image, determine the maximum index value; according to the maximum index value, use the inverse binary value of the truncated unary code Analyze the motion information index value of the skip mode or direct mode of the current coding unit in an optimized manner.
- the decoder device may also obtain the frame type of the video image (herein referred to as the current image) to which the current coding unit belongs.
- the frame type may include but not limited to B picture or P picture.
- the decoder device can determine the maximum index value according to the number of motion vector angle prediction candidate motion information and the number of inter-frame prediction candidate historical motion information, as well as the frame type of the current image.
- determining the maximum index value according to the number of motion vector angle prediction candidate motion information and the number of inter-frame prediction candidate historical motion information, as well as the frame type of the current image may include: determining the motion vector angle prediction candidate motion information number and the maximum value of the inter-frame prediction candidate historical motion information number; if the frame type of the current image is a P image, then the sum of the maximum value and 1 is determined as the maximum index value; if the frame of the current image If the type is a B image, the sum of the maximum value and 3 is determined as the maximum index value.
- the number of MHBSKIP candidate motion information is 1; for a B picture, the number of MHBSKIP candidate motion information is 3. Therefore, when the frame type of the current image is a P image, the sum of the maximum value of NumOfMvapCand and NumOfHmvpCand and 1 can be determined as maxVal. In the case that the frame type of the current image is a B image, the sum of the maximum value of NumOfMvapCand and NumOfHmvpCand and 3 may be determined as maxVal.
- the determined The value of maxVal will be reduced, thereby saving the bit overhead when encoding the motion information index value in the skip mode or the direct mode by using the binarization method of truncating unary codes, and improving the encoding and decoding performance.
- the decoding end device may analyze the motion information index value of the skip mode or direct mode of the current coding unit by using the debinarization method of truncated unary code according to the determined maxVal.
- the corresponding relationship between maxVal and the motion information index value of the skip mode or the direct mode may refer to the relevant information recorded in Table 1.
- determining the prediction mode of the current coding unit according to the motion information index value of the skip mode or the direct mode and the candidate list of the current coding unit may include: predicting the number of modes according to the effective angle, and skipping The motion information index value of the mode or direct mode determines the prediction mode of the current coding unit.
- the decoding end device determines the motion information index value of the skip mode or direct mode of the current coding unit according to the above method, it can predict the mode number (ValidMvapModeNum) according to the valid angle, and the motion information of the skip mode or direct mode Information index value, which determines the prediction mode of the current coding unit.
- determining the prediction mode of the current coding unit according to the number of effective angle prediction modes and the motion information index value of the skip mode or the direct mode may include: if the motion information index value of the skip mode or the direct mode is greater than or is equal to N, when the number of effective angle prediction modes is greater than 0, and the motion information index value of the skip mode or direct mode is less than the sum of N and the number of effective angle prediction modes, it is determined that the prediction mode of the current coding unit is the motion vector angle Prediction mode; when the number of effective angle prediction modes is equal to 0, or the motion information index value of skip mode or direct mode is greater than or equal to the sum of N and the number of effective angle prediction modes, it is determined that the prediction mode of the current coding unit is based on Motion vector prediction mode for historical information.
- the decoding end device when the decoding end device determines the motion information index value of the skip mode or the direct mode in the above manner, it may determine whether the motion information index value of the skip mode or the direct mode is greater than N.
- N is a positive integer.
- N may be the sum of time domain candidate motion information in the candidate list and candidate motion information generated by MHBSKIP.
- the value of N may be determined according to the frame type of the current image.
- the decoding end device may also determine whether ValidMvapModeNum is greater than 0, and the motion information index value of the skip mode or direct mode Whether it is less than the sum of N and ValidMvapModeNum.
- the decoding end device may determine that the prediction mode of the current coding unit is the motion vector angle prediction mode.
- the decoding end device may determine that the prediction mode of the current coding unit is the motion vector prediction mode based on historical information.
- the prediction mode of the current coding unit may further include: when the prediction mode of the current coding unit is a motion vector prediction mode based on historical information, if the current coding unit is an inter prediction unit and is not an analog
- the shot prediction unit is not an angle weighted prediction unit and is not an enhanced time-domain motion vector prediction unit and is not a motion vector angle prediction unit and is not a sub-block time-domain motion information prediction unit, and the number of inter-frame prediction candidate historical motion information is greater than 0, Then update the historical exercise information table; otherwise, do not update the historical exercise information table.
- the decoding-end device may determine whether the current coding unit satisfies the following condition: the current coding unit is an inter prediction unit, the current coding unit is not an affine prediction unit, the current coding unit is not an angle-weighted prediction unit, the current coding unit is not an enhanced temporal motion vector prediction unit, the current coding unit is not a motion vector angle prediction unit, and the current coding unit is not The sub-block time-domain motion information prediction unit, and the number of historical motion information candidates for inter-frame prediction (ie, NumOfHmvpCand) are greater than 0.
- the decoding end device may update the historical motion information table (HmvpCandList).
- the decoding end device may update the historical motion information table according to the motion information, BgcFlag and BgcIndex of the current prediction block.
- the decoding end device may not update the historical motion information table.
- the determination of the number of candidate motion information for motion vector angle prediction according to the value of the enhanced time-domain motion vector prediction and motion vector angle prediction may include: when the enhanced time-domain motion vector prediction and motion vector angle prediction When the value of the prediction permission flag is 1, the number of candidate motion information for motion vector angle prediction is determined to be 5, and the value of the enhanced time-domain motion vector prediction and motion vector angle prediction permission flag is 1, indicating that the enhanced time-domain motion vector can be used prediction and motion vector angle prediction; when the value of the enhanced temporal motion vector prediction and motion vector angle prediction permission flag is 0, or the enhanced time domain motion vector prediction and motion vector angle prediction permission flag does not exist in the code stream, Determine the number of candidate motion information for motion vector angle prediction is 0, the value of the enhanced time-domain motion vector prediction and motion vector angle prediction permission flag is 0, or there is no enhanced time-domain motion vector prediction and motion vector angle prediction permission in the code stream Flag indicating that enhanced temporal motion vector prediction and motion vector angle prediction should not be used.
- the enhanced time domain motion vector prediction and motion vector angle prediction enable flags may be used to indicate whether enhanced time domain motion vector prediction and motion vector angle prediction can be used.
- the value of the enhanced temporal motion vector prediction and motion vector angle prediction allowed flag is 1, indicating that the enhanced temporal motion vector prediction and motion vector angle prediction can be used; the enhanced temporal motion vector prediction and motion vector angle prediction are allowed A flag with a value of 0 indicates that enhanced temporal motion vector prediction and motion vector angle prediction should not be used.
- the decoding end device when the decoding end device receives the code stream, it may parse the value of the enhanced time-domain motion vector prediction and motion vector angle prediction permission flags.
- the decoding end device can determine that NumOfMvapCand is 5.
- the decoding end device may determine that NumOfMvapCand is 0.
- the decoding end device may determine that the enhanced time-domain motion vector prediction and motion vector angle prediction enable flags are 0, That is, the enhanced time-domain motion vector prediction and motion vector angle prediction cannot be used. At this time, the decoding end device may determine that NumOfMvapCand is 0.
- FIG. 9 is a schematic flow chart of an encoding method provided by an embodiment of the present application, wherein the encoding method can be applied to an encoding end device.
- the encoding method can include the following steps:
- Step S900 constructing a candidate list of skip mode or direct mode: traverse each prediction mode in the prediction mode candidate list in order, and for each prediction mode, obtain the motion information of the current coding unit and the skipping of the current coding unit Motion information index value for mode or direct mode.
- Step S910 Perform motion compensation on the current coding unit according to the motion information of the current coding unit.
- Step S920 Calculate the rate-distortion cost corresponding to the prediction mode, compare the rate-distortion cost with cost values of other candidate prediction modes, and select the prediction mode corresponding to the smallest rate-distortion cost.
- Step S930 Carry the motion information index value of the skip mode or the direct mode of the current coding unit corresponding to the prediction mode with the smallest rate-distortion cost into the code stream, and transmit it to the decoding end.
- step S930 carrying the motion information index value of the skip mode or the direct mode of the current coding unit corresponding to the prediction mode with the smallest rate-distortion cost into the code stream can be implemented by the following steps:
- Step S931 acquiring the number of candidate motion information for motion vector angle prediction and the number of historical motion information for inter-frame prediction candidates.
- Step S932 According to the number of candidate motion information for motion vector angle prediction and the number of historical motion information for inter prediction candidates, encode the motion information index value of the skip mode or direct mode of the current coding unit, and carry it into the code stream.
- the maximum index value (ie maxVal) is no longer fixed at 11, but the number of candidate motion information and the number of candidate historical motion information for inter-frame prediction can be predicted according to the motion vector angle The number is determined.
- the encoding end device when the encoding end device needs to encode the motion information index value, NumOfMvapCand and NumOfHmvpCand can be obtained.
- the encoding end device may determine NumOfMvapCand and NumOfHmvpCand through encoding sequence-level high-level syntax.
- the encoding end device may encode the motion information index value of the skip mode or the direct mode of the current coding unit according to NumOfMvapCand and NumOfHmvpCand, and carry it into the code stream.
- step S932 encode the motion information index value of the skip mode or direct mode of the current coding unit according to the number of motion vector angle prediction candidate motion information and the number of inter-frame prediction candidate historical motion information, It may include: determining the maximum index value according to the number of candidate motion information for motion vector angle prediction and the number of historical motion information for inter-frame prediction candidates; according to the maximum index value, encoding the current coding unit in a binarization manner with truncated unary codes Motion information index value for skip mode or direct mode.
- the encoder device can determine the maximum index value (that is, maxVal) according to the determined NumOfMvapCand and NumOfHmvpCand, and use the binarization method of truncating the unary code according to the maxVal
- maxVal the maximum index value
- a motion information index value of a skip mode or a direct mode is encoded for the current coding unit.
- the maxVal determined according to the determined NumOfMvapCand and NumOfHmvpCand is less than or equal to 11.
- the encoder device can determine maxVal in the following manner:
- maxVal ⁇ 11 determined according to the above method, according to the maxVal, when the motion information index value of the skip mode or the direct mode is coded by using the binarization method of truncating the unary code,
- the determination of the maximum index value based on the number of motion information candidates for motion vector angle prediction and the number of historical motion information candidates for inter-frame prediction may include: predicting the number of motion information candidates for motion vector angle prediction and the number of inter-frame prediction Predict the number of candidate historical motion information and the frame type of the current image to determine the maximum index value.
- the number of candidate motion information of MHBSKIP corresponding to different frame types may be different, for example, for a P picture, the number of candidate motion information of MHBSKIP is 1; for a B picture, the number of candidate motion information of MHBSKIP is 3.
- the frame type can also be considered, that is, the encoding end device can be based on the motion
- the number of vector angle prediction candidate motion information, the number of inter-frame prediction candidate historical motion information, and the frame type of the current image determine the motion information index value of the skip mode or direct mode of the current coding unit.
- the frame type may include but not limited to B picture or P picture.
- the encoder device may determine the maximum index value according to the number of motion vector angle prediction candidate motion information and the number of inter-frame prediction candidate historical motion information, as well as the frame type of the current image.
- the number of MHBSKIP candidate motion information is 1; for a B picture, the number of MHBSKIP candidate motion information is 3.
- the sum of the maximum value of NumOfMvapCand and NumOfHmvpCand and 3 may be determined as maxVal.
- the determined The value of maxVal will be reduced, thereby saving the bit overhead when encoding the motion information index value in the skip mode or the direct mode by using the binarization method of truncating unary codes, and improving the encoding and decoding performance.
- the motion information index value of the skip mode or direct mode of the current coding unit may be encoded by using the binarization method of truncating the unary code according to the determined maxVal .
- the optimization scheme in this embodiment of the present application may include some or all of the following:
- the motion information index value cu_subtype_index of the skip mode or the direct mode of the current coding unit is parsed according to the frame type of the current image and NumOfMvapCand and NumOfHmvpCand.
- ValidMvapModeNum is obtained, and it is determined whether the current coding unit type is MVAP mode or HMVP mode according to cu_subtype_index and ValidMvapModeNum.
- Embodiment 1 encoding method and encoding device
- Construct a candidate list of skip mode or direct mode Traverse each prediction mode in the prediction mode candidate list in order, and for each prediction mode, obtain the motion information of the current coding unit and the skip mode of the current coding unit Or the motion information index value for direct mode.
- Embodiment 2 decoding method and decoding device
- NumOfHmvpCand is num_of_hmvp_cand, where the value range of num_of_hmvp_cand is 0-8.
- maxVal (3+Max(NumOfMvapCand, NumOfHmvpCand)).
- NumOfHmvpCand is num_of_hmvp_cand, where the value range of num_of_hmvp_cand is 0-8.
- maxVal (3+Max(NumOfMvapCand, NumOfHmvpCand)).
- NumOfHmvpCand is num_of_hmvp_cand, where the value range of num_of_hmvp_cand is 0-8.
- NumOfHmvpCand is num_of_hmvp_cand, where the value range of num_of_hmvp_cand is 0-8.
- NumOfHmvpCand is num_of_hmvp_cand, where the value range of num_of_hmvp_cand is 0-8.
- N 2
- N 4
- maxVal (3+Max(NumOfMvapCand, NumOfHmvpCand)).
- NumOfHmvpCand is num_of_hmvp_cand, where the value range of num_of_hmvp_cand is 0-8.
- maxVal (3+Max(NumOfMvapCand, NumOfHmvpCand)).
- NumOfHmvpCand is num_of_hmvp_cand, where the value range of num_of_hmvp_cand is 0-8.
- the current coding unit type is Hmvp mode.
- NumOfHmvpCand is num_of_hmvp_cand, where the value range of num_of_hmvp_cand is 0-8.
- the current coding unit type is Hmvp mode.
- etmvp_mvap_enable_flag can be used to identify whether to enable ETMVP and MVAP.
- a value of '1' indicates that enhanced temporal motion vector prediction and motion vector angle prediction can be used; a value of '0' indicates that enhanced temporal motion vector prediction and motion vector angle prediction should not be used.
- the value of EtmvpMvapEnableFlag is equal to the value of etmvp_mvap_enable_flag.
- the current prediction unit After the decoding of the current prediction unit (that is, the current coding unit) is completed, if the current prediction unit is an inter prediction unit and is not an enhanced temporal motion vector prediction unit and is not a motion vector angle prediction unit and is not a sub-block temporal motion information prediction unit, And, when NumOfHmvpCand (the amount of motion information that can be updated) is greater than 0, update the historical motion information table HmvpCandList according to the motion information, BgcFlag and BgcIndex of the current prediction block;
- the current prediction unit is not an inter prediction unit, the current prediction unit is an enhanced temporal motion vector prediction unit, the current prediction unit is a motion vector angle prediction unit, or the current prediction unit is a sub-block temporal motion information prediction At least one of the conditions such as the unit is true, and the historical motion information table is not updated.
- NumOfHmvpCand the number of motion information that can be updated
- the current prediction unit is not an inter prediction unit, the current prediction unit is an affine prediction unit, the current prediction unit is an angle weighted prediction unit, the current prediction unit is an enhanced temporal motion vector prediction unit, and the current prediction unit is a motion vector angle prediction unit , or the current prediction unit is a sub-block temporal motion information prediction unit, and at least one of the conditions is satisfied, and the historical motion information table is not updated.
- FIG. 11 is a schematic structural diagram of a decoding device provided by an embodiment of the present application, wherein the decoding device may include: a decoding module 1110, configured to receive a code stream, analyze the skip mode of the current coding unit or directly The motion information index value of the mode; the construction module 1120 is used to construct the candidate list of the skip mode or the direct mode; the determination module 1130 is used to determine according to the motion information index value and the candidate list of the skip mode or the direct mode of the current coding unit The prediction mode of the current coding unit; the compensation module 1140, configured to acquire the motion information of the current coding unit according to the prediction mode of the current coding unit, and perform motion compensation on the current coding unit.
- a decoding module 1110 configured to receive a code stream, analyze the skip mode of the current coding unit or directly The motion information index value of the mode
- the construction module 1120 is used to construct the candidate list of the skip mode or the direct mode
- the determination module 1130 is used to determine according to the motion information index value and
- the decoding module 1110 is specifically configured to obtain the number of motion vector angle prediction candidate motion information and the number of inter-frame prediction candidate history motion information; according to the motion vector angle prediction candidate motion information number and the inter-frame prediction candidate history The number of motion information determines the motion information index value of the skip mode or direct mode of the current coding unit.
- the decoding module 1110 is specifically configured to obtain the number of candidate motion information of the motion vector angle prediction and the number of historical motion information of the inter-frame prediction candidates by analyzing sequence-level high-level syntax.
- the decoding module 1110 is specifically configured to parse the enhanced time-domain motion vector prediction and motion vector angle prediction enable flags, according to the value of the enhanced time-domain motion vector prediction and motion vector angle prediction enable flags, Determine the number of candidate motion information for motion vector angle prediction; and analyze the index of the number of historical motion information for inter-frame prediction candidates, and determine the inter-frame prediction according to the value of the index for the number of historical motion information for inter-frame prediction candidates The number of candidate historical motion information; wherein, the enhanced time-domain motion vector prediction and motion vector angle prediction enable flags are used to indicate that the enhanced time-domain motion vector prediction mode and the motion vector angle prediction mode are turned on at the same time, or, the enhanced time-domain motion vector prediction mode is turned off at the same time Motion Vector Prediction Mode and Motion Vector Angle Prediction Mode.
- the determining module 1130 is specifically configured to determine the current encoding according to the number of motion vector angle prediction candidate motion information and the number of inter-frame prediction candidate historical motion information, as well as the frame type of the current image.
- the determining module 1130 is specifically configured to determine the maximum index value according to the number of motion vector angle prediction candidate motion information and the number of inter-frame prediction candidate historical motion information, as well as the frame type of the current image; According to the maximum index value, the motion information index value of the skip mode or the direct mode of the current coding unit is parsed by using a truncated unary code debinarization manner.
- the determining module 1130 is specifically configured to determine the maximum value of the number of candidate motion information for motion vector angle prediction and the number of historical motion information for inter-frame prediction candidates; if the frame type of the current image If it is a P image, the sum of the maximum value and 1 is determined as the maximum index value; if the frame type of the current image is a B image, the sum of the maximum value and 3 is determined as the maximum index value value.
- the determining module 1130 is specifically configured to determine that the prediction mode of the current coding unit is the motion vector angle prediction mode according to the number of effective angle prediction modes and the motion information index value of the skip mode or direct mode It is also a motion vector prediction mode based on historical information.
- the determining module 1130 is specifically configured to: if the motion information index value of the skip mode or direct mode is greater than or equal to N: when the number of effective angle prediction modes is greater than 0, and the When the motion information index value of skip mode or direct mode is less than the sum of N and the number of effective angle prediction modes, it is determined that the prediction mode of the current coding unit is a motion vector angle prediction mode; when the effective angle prediction mode number is equal to 0, or, when the motion information index value of the skip mode or direct mode is greater than or equal to the sum of N and the effective angle prediction mode number, it is determined that the prediction mode of the current coding unit is based on historical information motion vector prediction mode.
- the determining module 1130 is further configured to: when the prediction mode of the current coding unit is a motion vector prediction mode based on historical information, if the current coding unit is an inter prediction unit and is not an affine The prediction unit is not an angle-weighted prediction unit and is not an enhanced time-domain motion vector prediction unit and is not a motion vector angle prediction unit and is not a sub-block time-domain motion information prediction unit, and the number of inter-frame prediction candidate historical motion information is greater than 0 , the historical exercise information table is updated; otherwise, the historical exercise information table is not updated.
- the decoding module 1110 is specifically configured to determine the number of candidate motion information of the motion vector angle prediction when the value of the enhanced time-domain motion vector prediction and motion vector angle prediction enable flag is 1 is 5; wherein, the value of the enhanced time-domain motion vector prediction and motion vector angle prediction permission flag is 1, indicating that the current coding unit can use enhanced time-domain motion vector prediction and motion vector angle prediction; when the enhanced time-domain The value of the motion vector prediction and motion vector angle prediction permission flags is 0, or when the enhanced time-domain motion vector prediction and motion vector angle prediction permission flags do not exist in the code stream, determine the motion vector angle prediction candidate motion information The number is 0; wherein, the value of the enhanced time-domain motion vector prediction and motion vector angle prediction permission flag is 0, or the enhanced time-domain motion vector prediction and motion vector angle prediction permission flag does not exist in the code stream , indicating that the current coding unit should not use enhanced temporal motion vector prediction and motion vector angle prediction.
- FIG. 12 is a schematic structural diagram of an encoding device provided by an embodiment of the present application, wherein the encoding device may include: a construction module 1210, configured to construct a candidate list for skip mode or direct mode: traverse in order For each prediction mode in the prediction mode candidate list, for each prediction mode, obtain the motion information of the current coding unit and the motion information index value of the skip mode or the direct mode of the current coding unit; the compensation module 1220 is used to The motion information of the current coding unit is used to perform motion compensation on the current coding unit; the determination module 1230 is used to calculate the rate-distortion cost value corresponding to the prediction mode, and compare the rate-distortion cost value with the cost values of other candidate prediction modes, Select the prediction mode corresponding to the smallest rate-distortion cost value; the encoding module 1240 is used to carry the skip mode or direct mode motion information index value of the current coding unit corresponding to the prediction mode with the smallest rate-distortion cost value into the code
- the encoding module 1240 is specifically configured to obtain the number of motion vector angle prediction candidate motion information and the number of inter-frame prediction candidate history motion information; according to the motion vector angle prediction candidate motion information number and the inter-frame prediction candidate history
- the number of motion information is to encode the motion information index value of the skip mode or direct mode of the current coding unit, and carry it into the code stream.
- the encoding module 1240 is specifically configured to determine a maximum index value according to the number of motion vector angle prediction candidate motion information and the number of inter-frame prediction candidate historical motion information; according to the maximum index value,
- the motion information index value of the skip mode or the direct mode of the current coding unit is coded in a binarization manner of truncated unary code.
- the encoding module 1240 is specifically configured to determine the maximum index value according to the number of motion vector angle prediction candidate motion information, the number of inter-frame prediction candidate historical motion information, and the frame type of the current image.
- FIG. 13 is a schematic diagram of a hardware structure of a decoder device provided by an embodiment of the present application.
- the decoding end device may include a processor 1301 and a machine-readable storage medium 1302 storing machine-executable instructions.
- the processor 1301 and the machine-readable storage medium 1302 can communicate via the system bus 1303 .
- the processor 1301 can execute the decoding method of the decoding end device described above.
- the machine-readable storage medium 1302 referred to herein may be any electronic, magnetic, optical, or other physical storage device that may contain or store information, such as executable instructions, data, and the like.
- the machine-readable storage medium can be: RAM (Radom Access Memory, random access memory), volatile memory, non-volatile memory, flash memory, storage drive (such as hard disk drive), solid state drive, any type of storage disk (such as CD, DVD, etc.), or similar storage media, or a combination of them.
- machine-readable storage medium where machine-executable instructions are stored in the machine-readable storage medium, and when the machine-executable instructions are executed by a processor, the decoding end device described above is realized the decoding method.
- the machine-readable storage medium may be ROM, RAM, CD-ROM, magnetic tape, floppy disk, and optical data storage device, among others.
- FIG. 14 is a schematic diagram of a hardware structure of an encoding end device provided by an embodiment of the present application.
- the encoding end device may include a processor 1401 and a machine-readable storage medium 1402 storing machine-executable instructions.
- the processor 1401 and the machine-readable storage medium 1402 can communicate via the system bus 1403 .
- the processor 1401 can execute the encoding method of the encoding end device described above.
- the machine-readable storage medium 1402 referred to herein may be any electronic, magnetic, optical, or other physical storage device that may contain or store information, such as executable instructions, data, and the like.
- the machine-readable storage medium can be: RAM (Radom Access Memory, random access memory), volatile memory, non-volatile memory, flash memory, storage drive (such as hard disk drive), solid state drive, any type of storage disk (such as CD, DVD, etc.), or similar storage media, or a combination of them.
- a machine-readable storage medium where machine-executable instructions are stored in the machine-readable storage medium, and when the machine-executable instructions are executed by a processor, the encoding terminal device described above is realized encoding method.
- the machine-readable storage medium may be ROM, RAM, CD-ROM, magnetic tape, floppy disk, optical data storage device, and the like.
- a camera device including the decoding device and/or the encoding device in any of the above embodiments.
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Abstract
Description
模式索引 | 模式描述 |
0 | Horizontal(水平) |
1 | Vertical(垂直) |
2 | Horizontal_Up(水平偏上) |
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Claims (21)
- 一种解码方法,其特征在于,包括:接收码流,解析当前编码单元的跳过模式或直接模式的运动信息索引值;构建跳过模式或直接模式的候选列表;根据当前编码单元的跳过模式或直接模式的运动信息索引值和候选列表确定当前编码单元的预测模式;根据当前编码单元的预测模式获取当前编码单元的运动信息,对当前编码单元进行运动补偿;其中,所述解析当前编码单元的跳过模式或直接模式的运动信息索引值,包括:获取运动矢量角度预测候选运动信息个数和帧间预测候选历史运动信息个数;根据所述运动矢量角度预测候选运动信息个数和帧间预测候选历史运动信息个数,确定所述当前编码单元的跳过模式或直接模式的运动信息索引值。
- 根据权利要求1所述的方法,其特征在于,所述获取运动矢量角度预测候选运动信息个数和帧间预测候选历史运动信息个数,包括:通过解析序列级高层语法,获取所述运动矢量角度预测候选运动信息个数和所述帧间预测候选历史运动信息个数。
- 根据权利要求2所述的方法,其特征在于,所述通过解析序列级高层语法,获取所述运动矢量角度预测候选运动信息个数和所述帧间预测候选历史运动信息个数,包括:解析增强时域运动矢量预测和运动矢量角度预测允许标志,根据所述增强时域运动矢量预测和运动矢量角度预测允许标志的取值,确定所述运动矢量角度预测候选运动信息个数;以及,解析帧间预测候选历史运动信息个数索引,根据所述帧间预测候选历史运动信息个数索引的取值,确定所述帧间预测候选历史运动信息个数;其中,所述增强时域运动矢量预测和运动矢量角度预测允许标志用于指示同时开启增强时域运动矢量预测模式和运动矢量角度预测模式,或,同时关闭增强时域运动矢量预测模式和运动矢量角度预测模式。
- 根据权利要求1-3任一项所述的方法,其特征在于,所述根据所述运动矢量角度预测候选运动信息个数和帧间预测候选历史运动信息个数,确定所述当前编码单元的跳过模式或直接模式的运动信息索引值,包括:根据所述运动矢量角度预测候选运动信息个数和帧间预测候选历史运动信息个数,以及当前图像的帧类型,确定所述当前编码单元的跳过模式或直接模式的运动信息索引值。
- 根据权利要求4所述的方法,其特征在于,所述根据所述运动矢量角度预测候选运动信息个数和帧间预测候选历史运动信息个数,以及当前图像的帧类型,确定所述当前编码单元的跳过模式或直接模式的运动信息索引值,包括:根据所述运动矢量角度预测候选运动信息个数和帧间预测候选历史运动信息个数,以及当前图像的帧类型,确定最大索引值;根据所述最大索引值,采用截断一元码的反二值化方式解析当前编码单元的跳过模式或直接模式的运动信息索引值。
- 根据权利要求5所述的方法,其特征在于,所述根据所述运动矢量角度预测候选运动信息个数和帧间预测候选历史运动信息个数,以及当前图像的帧类型,确定最大索引值,包括:确定所述运动矢量角度预测候选运动信息个数和帧间预测候选历史运动信息个数中的最大值;若所述当前图像的帧类型为P图像,则将该最大值与1二者之和,确定为最大索引 值;若所述当前图像的帧类型为B图像,则将该最大值与3二者之和,确定为最大索引值。
- 根据权利要求1-6任一项所述的方法,其特征在于,所述根据当前编码单元的跳过模式或直接模式的运动信息索引值和候选列表确定当前编码单元的预测模式,包括:根据有效角度预测模式数,以及所述跳过模式或直接模式的运动信息索引值,确定当前编码单元的预测模式是运动矢量角度预测模式还是基于历史信息的运动矢量预测模式。
- 根据权利要求7所述的方法,其特征在于,所述根据有效角度预测模式数,以及所述跳过模式或直接模式的运动信息索引值,确定当前编码单元的预测模式是运动矢量角度预测模式还是基于历史信息的运动矢量预测模式,包括:若所述跳过模式或直接模式的运动信息索引值大于或等于N,则:当所述有效角度预测模式数大于0,且所述跳过模式或直接模式的运动信息索引值小于N与所述有效角度预测模式数二者之和时,确定所述当前编码单元的预测模式为运动矢量角度预测模式;当所述有效角度预测模式数等于0,或,所述跳过模式或直接模式的运动信息索引值大于或等于N与所述有效角度预测模式数二者之和时,确定所述当前编码单元的预测模式为基于历史信息的运动矢量预测模式。
- 根据权利要求8所述的方法,其特征在于,若当前图像的帧类型为P图像,则N=2;若当前图像的帧类型为B图像,则N=4。
- 根据权利要求7-9任一项所述的方法,其特征在于,所述确定当前编码单元的预测模式之后,还包括:当所述当前编码单元的预测模式为基于历史信息的运动矢量预测模式时,若所述当前编码单元为帧间预测单元且不是仿射预测单元且不是角度加权预测单元且不是增强时域运动矢量预测单元且不是运动矢量角度预测单元且不是子块时域运动信息预测单元,以及,所述帧间预测候选历史运动信息个数大于0,则更新历史运动信息表;否则,不更新所述历史运动信息表。
- 根据权利要求3所述的方法,其特征在于,所述根据所述增强时域运动矢量预测和运动矢量角度预测允许标志的取值,确定所述运动矢量角度预测候选运动信息个数,包括:当所述增强时域运动矢量预测和运动矢量角度预测允许标志的取值为1时,确定所述运动矢量角度预测候选运动信息个数为5;其中,所述增强时域运动矢量预测和运动矢量角度预测允许标志的取值为1,表示当前编码单元可使用增强时域运动矢量预测和运动矢量角度预测;当所述增强时域运动矢量预测和运动矢量角度预测允许标志的取值为0,或,码流中不存在所述增强时域运动矢量预测和运动矢量角度预测允许标志时,确定所述运动矢量角度预测候选运动信息个数为0;其中,所述增强时域运动矢量预测和运动矢量角度预测允许标志的取值为0,或,码流中不存在所述增强时域运动矢量预测和运动矢量角度预测允许标志,表示当前编码单元不应使用增强时域运动矢量预测和运动矢量角度预测。
- 一种编码方法,其特征在于,包括:构建跳过模式或直接模式的候选列表:按顺序遍历预测模式候选列表中的每一种预测模式,对于每一种预测模式,获取当前编码单元的运动信息和当前编码单元的跳过模式或直接模式的运动信息索引值;根据当前编码单元的运动信息,对当前编码单元进行运动补偿;计算该预测模式对应的率失真代价值,并将该率失真代价值与其他候选预测模式的 代价值进行比较,选择最小的率失真代价值所对应的预测模式;将率失真代价值最小的预测模式对应的当前编码单元的跳过模式或直接模式的运动信息索引值携带进码流,传送给解码端;其中,所述将率失真代价值最小的预测模式对应的当前编码单元的跳过模式或直接模式的运动信息索引值携带进码流,包括:获取运动矢量角度预测候选运动信息个数和帧间预测候选历史运动信息个数;根据所述运动矢量角度预测候选运动信息个数和帧间预测候选历史运动信息个数,对所述当前编码单元的跳过模式或直接模式的运动信息索引值进行编码,并携带进码流。
- 根据权利要求12所述的方法,其特征在于,所述根据所述运动矢量角度预测候选运动信息个数和帧间预测候选历史运动信息个数,对所述当前编码单元的跳过模式或直接模式的运动信息索引值进行编码,包括:根据所述运动矢量角度预测候选运动信息个数和帧间预测候选历史运动信息个数,确定最大索引值;根据所述最大索引值,采用截断一元码的二值化方式编码所述当前编码单元的跳过模式或直接模式的运动信息索引值。
- 根据权利要求13所述的方法,其特征在于,所述根据所述运动矢量角度预测候选运动信息个数和帧间预测候选历史运动信息个数,确定最大索引值,包括:根据所述运动矢量角度预测候选运动信息个数和帧间预测候选历史运动信息个数,以及当前图像的帧类型,确定最大索引值。
- 根据权利要求12所述的方法,其特征在于,所述根据所述运动矢量角度预测候选运动信息个数和帧间预测候选历史运动信息个数,以及当前图像的帧类型,对所述当前编码单元的跳过模式或直接模式的运动信息索引值进行编码,包括:根据所述运动矢量角度预测候选运动信息个数和帧间预测候选历史运动信息个数,以及当前图像的帧类型,确定最大索引值;根据所述最大索引值,采用截断一元码的二值化方式编码所述当前编码单元的跳过模式或直接模式的运动信息索引值。
- 根据权利要求15所述的方法,其特征在于,所述根据所述运动矢量角度预测候选运动信息个数和帧间预测候选历史运动信息个数,以及当前图像的帧类型,确定最大索引值,包括:确定所述运动矢量角度预测候选运动信息个数和帧间预测候选历史运动信息个数中的最大值;若所述当前图像的帧类型为P图像,则将该最大值与1二者之和,确定为最大索引值;若所述当前图像的帧类型为B图像,则将该最大值与3二者之和,确定为最大索引值。
- 一种解码装置,其特征在于,包括:解码模块,用于接收码流,解析当前编码单元的跳过模式或直接模式的运动信息索引值;构建模块,用于构建跳过模式或直接模式的候选列表;确定模块,用于根据当前编码单元的跳过模式或直接模式的运动信息索引值和候选列表确定当前编码单元的预测模式;补偿模块,用于根据当前编码单元的预测模式获取当前编码单元的运动信息,对当前编码单元进行运动补偿;其中,所述解码模块,具体用于获取运动矢量角度预测候选运动信息个数和帧间预测候选历史运动信息个数;根据所述运动矢量角度预测候选运动信息个数和帧间预测候选历史运动信息个数, 确定所述当前编码单元的跳过模式或直接模式的运动信息索引值。
- 一种编码装置,其特征在于,包括:构建模块,用于构建跳过模式或直接模式的候选列表:按顺序遍历预测模式候选列表中的每一种预测模式,对于每一种预测模式,获取当前编码单元的运动信息和当前编码单元的跳过模式或直接模式的运动信息索引值;补偿模块,用于根据当前编码单元的运动信息,对当前编码单元进行运动补偿;确定模块,用于计算该预测模式对应的率失真代价值,并将该率失真代价值与其他候选预测模式的代价值进行比较,选择最小的率失真代价值所对应的预测模式;编码模块,用于将率失真代价值最小的预测模式对应的当前编码单元的跳过模式或直接模式的运动信息索引值携带进码流,传送给解码端;其中,所述编码模块,具体用于获取运动矢量角度预测候选运动信息个数和帧间预测候选历史运动信息个数;根据所述运动矢量角度预测候选运动信息个数和帧间预测候选历史运动信息个数,对所述当前编码单元的跳过模式或直接模式的运动信息索引值进行编码,并携带进码流。
- 一种解码端设备,其特征在于,包括处理器和机器可读存储介质,所述机器可读存储介质存储有能够被所述处理器执行的机器可执行指令,所述处理器用于执行机器可执行指令,以实现如权利要求1-11任一项所述的方法。
- 一种编码端设备,其特征在于,包括处理器和机器可读存储介质,所述机器可读存储介质存储有能够被所述处理器执行的机器可执行指令,所述处理器用于执行机器可执行指令,以实现如权利要求12-16任一项所述的方法。
- 一种机器可读存储介质,其特征在于,所述机器可读存储介质内存储有机器可执行指令,所述机器可执行指令被处理器执行时实现如权利要求1-11或12-16任一项所述的方法。
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