WO2017031671A1 - 运动矢量场编码方法和解码方法、编码和解码装置 - Google Patents
运动矢量场编码方法和解码方法、编码和解码装置 Download PDFInfo
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- 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
- H04N19/513—Processing of motion vectors
- H04N19/517—Processing of motion vectors by encoding
- H04N19/52—Processing of motion vectors by encoding by predictive encoding
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- H04N19/51—Motion estimation or motion compensation
- H04N19/513—Processing of motion vectors
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- 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
- H04N19/567—Motion estimation based on rate distortion criteria
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- H04N19/503—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using predictive coding involving temporal prediction
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- H04N19/573—Motion compensation with multiple frame prediction using two or more reference frames in a given prediction direction
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- H04N19/169—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the coding unit, i.e. the structural portion or semantic portion of the video signal being the object or the subject of the adaptive coding
- H04N19/17—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the coding unit, i.e. the structural portion or semantic portion of the video signal being the object or the subject of the adaptive coding the unit being an image region, e.g. an object
- H04N19/174—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the coding unit, i.e. the structural portion or semantic portion of the video signal being the object or the subject of the adaptive coding the unit being an image region, e.g. an object the region being a slice, e.g. a line of blocks or a group of blocks
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- H04N19/503—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using predictive coding involving temporal prediction
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- 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
- H04N19/577—Motion compensation with bidirectional frame interpolation, i.e. using B-pictures
Definitions
- the present invention relates to the field of image processing technologies, and in particular, to a motion vector field encoding method and a decoding method, an encoding and decoding apparatus.
- a video corresponding to a motion scene includes a series of video frames, each of which includes a still image, and the illusion of motion of the series of video frames is to display a continuous image relatively quickly, for example, at 15 to per second. The rate of 30 frames is displayed. Due to the relatively fast frame rate, the images on each video frame within the series of video frames are very similar.
- a video frame in the series of video frames is taken as a reference image, and a motion vector field of another video frame in the series of video frames refers to displacement information of the video frame relative to the reference image.
- the video frame may be an image adjacent to the reference image or may not be an image adjacent to the reference image.
- a video frame includes a plurality of pixels, and the image in the video frame can be divided into a plurality of image units, wherein each image unit includes at least one pixel, and motion vectors of all pixels in each image unit are the same That is, an image unit has a motion vector.
- the motion vector field of the video frame is made up of motion vectors for all image elements.
- Embodiments of the present invention provide a motion vector field coding method, a decoding method, an encoding and a decoding device.
- the compression efficiency of the motion vector field can be improved.
- a first aspect of the embodiments of the present invention provides a video encoding method, including:
- the prediction information and the prediction residual signal are written to a code stream.
- the acquiring the prediction signal of the current motion vector field block and the prediction information of the current motion vector field block includes:
- first reference motion vector field of the current motion vector field block where the first reference motion vector field is an encoded and reconstructed motion vector field, wherein the first reference motion vector field is a video frame at time t1
- the video frame at the time t1 is a video frame adjacent to the video frame at the time t;
- the prediction signal includes a motion vector field block of the second reference motion vector field, where a motion vector field block of the second reference motion vector field is a coordinate range in the second reference motion vector field is the same as a coordinate range of the current motion vector field block in the current motion vector field;
- the prediction information includes the information used to indicate the first reference motion vector field.
- the first reference motion vector field, the t time, the t1 time, and the t2 At the moment, the second reference motion vector field is obtained, including:
- the first reference motion vector field, the t time, the t1 time, and the t2 At the moment, the second reference motion vector field is obtained, including:
- a position of the second sampling point starts from a position of each of the at least two first sampling points of the first reference motion vector field, respectively Positioning the respective movement vectors of the at least two first sampling points as displacements, the positions moved to the same position, and the respective motion vectors of the at least two first sampling points are the at least two first sampling points respectively The product of the motion vector and (t-t1)/(t1-t2);
- a product of a weighted average of the motion vectors of the at least two first sampling points and (t-t1)/(t1-t2) is used as a motion vector of the second sampling point.
- the first reference motion vector field, the t time, the t1 time, and the t2 At the moment, the second reference motion vector field is obtained, including:
- the weighting value of the one second sampling point is used as a motion vector of the target second sampling point
- a weighted average of motion vectors of the at least two second sampling points is used as a motion vector of the target second sampling point.
- the acquiring the prediction signal of the current motion vector field block and the prediction information of the current motion vector field block includes:
- the prediction information is acquired according to the direction coefficient, and the prediction information includes direction coefficient information indicating the direction coefficient.
- the acquiring a direction coefficient of the current motion vector field block includes:
- the coefficient of the preset function obtained by fitting is taken as the direction coefficient.
- the acquiring a direction coefficient of the current motion vector field block includes:
- the acquiring the direction coefficient of the current motion vector field block includes:
- the squares of the at least two encoded motion vector field blocks are The direction coefficient is used as the direction coefficient of the current motion vector field block.
- the acquiring the direction coefficient of the current motion vector field block includes:
- a ratio of a first component of a motion vector of the one sampling point to a second component of a motion vector of the one sampling point is used as a candidate for the candidate direction coefficient set Direction coefficient;
- a second aspect of the embodiments of the present invention provides a motion motion vector field decoding method, including:
- the current motion vector field block is obtained by dividing the current motion vector field, where the current motion vector field is a motion vector corresponding to the video frame at time t field;
- the prediction information includes the information for indicating a first reference motion vector field of the motion vector field block
- the first reference motion vector field Acquiring, according to the prediction information, the first reference motion vector field, where the first reference motion vector field is a motion vector field of a video frame at time t1;
- a motion vector field block of the second reference motion vector field Acquiring a motion vector field block of the second reference motion vector field, wherein a coordinate range of the motion vector field block of the second reference motion vector field in the second reference motion vector field and the current motion vector field
- the block has the same coordinate range in the current motion vector field
- the prediction signal includes a motion vector field block of the second reference motion vector field.
- the first reference motion vector field, the t time, the t1 time, and the t2 At the moment, the second reference motion vector field is obtained, including:
- a motion vector of the second sampling point of the second reference motion vector field where a motion vector of the first sampling point of the first reference motion vector field; wherein, starting from a position of the first sampling point, a motion vector of the second sampling point is a position to which the displacement is moved The position of the second sampling point is the same position.
- the first reference motion vector field, the t time, the t1 time, and the t2 At the moment, the second reference motion vector field is obtained, including:
- a position of the second sampling point starts from a position of each of the at least two first sampling points of the first reference motion vector field, respectively Positioning the respective movement vectors of the at least two first sampling points as displacements, the positions moved to the same position, and the respective motion vectors of the at least two first sampling points are the at least two first sampling points respectively The product of the motion vector and (t-t1)/(t1-t2);
- a product of a weighted average of the motion vectors of the at least two first sampling points and (t-t1)/(t1-t2) is used as a motion vector of the second sampling point.
- the first reference motion vector field, the t time, the t1 time, and the t2 At the moment, the second reference motion vector field is obtained, including:
- the weighting value of the one second sampling point is used as a motion vector of the target second sampling point
- a weighted average of motion vectors of the at least two second sampling points is used as a motion vector of the target second sampling point.
- the prediction information includes direction coefficient information indicating a direction coefficient of the current motion vector field block, where the direction coefficient is used to indicate Determining a relationship between a value of a first component of a motion vector of a sample point of the current motion vector field block and a value of a second component of the motion vector of the sample point;
- the direction coefficient information includes a reconstructed motion vector field block in the current motion vector field Information, the direction coefficient includes a direction coefficient of the reconstructed motion vector field block;
- the direction coefficient information includes a value of the direction coefficient.
- a third aspect of the embodiments of the present invention provides an encoding apparatus, including:
- a first acquiring module configured to acquire an original signal of a current motion vector field block, where the current motion vector field block is obtained by dividing a current motion vector field, where the current motion vector field is a video frame corresponding to time t Motion vector field
- a second acquiring module configured to acquire a prediction signal of the current motion vector field block and prediction information of the current motion vector field block, where the prediction information is used to indicate information required to acquire the prediction signal;
- a calculation module configured to calculate, according to the prediction signal acquired by the second acquiring module and the original signal acquired by the first acquiring module, a prediction residual signal of the current motion vector field block, where the prediction residual a difference signal is used to indicate a residual between the original signal and the prediction signal;
- an encoding module configured to write the prediction information acquired by the second acquiring module and the prediction residual signal calculated by the computing module into a code stream.
- the second obtaining module is configured to:
- first reference motion vector field of the current motion vector field block where the first reference motion vector field is an encoded and reconstructed motion vector field, wherein the first reference motion vector field is a video frame at time t1
- the video frame at the time t1 is a video frame adjacent to the video frame at the time t;
- the prediction signal includes a motion vector field block of the second reference motion vector field, where a motion vector field block of the second reference motion vector field is a coordinate range in the second reference motion vector field is the same as a coordinate range of the current motion vector field block in the current motion vector field;
- the prediction information includes the information used to indicate the first reference motion vector field.
- the second acquisition mode is used according to a calculation formula Calculating a motion vector of the second sampling point of the second reference motion vector field, where a motion vector of the first sampling point of the first reference motion vector field; wherein, with the position of the first sampling point as a starting point, a position moved by the motion vector of the second sampling point as a displacement The position of the second sampling point is the same position.
- the second acquisition mode is used to determine a second sampling point of the second reference motion vector field
- the position of the second sampling point is respectively started from the position of each of the at least two first sampling points of the first reference motion vector field, and the respective motion vectors of the at least two first sampling points are Displacement, where the moved position is the same position, and the respective motion vectors of the at least two first sampling points are respective motion vectors of the at least two first sampling points and (t-t1)/(t1-t2) Product of
- a product of a weighted average of the motion vectors of the at least two first sampling points and (t-t1)/(t1-t2) is used as a motion vector of the second sampling point.
- the second acquisition mode is used to acquire a target second sampling with the second reference motion vector field At least one second sampling point adjacent to the point, wherein a position of any one of the first sampling points of the first reference motion vector field is used as a starting point For displacement, the position moved to is different from the position of the second sampling point of the target. a motion vector of the first sampling point;
- the weighting value of the one second sampling point is used as a motion vector of the target second sampling point
- a weighted average of motion vectors of the at least two second sampling points is used as a motion vector of the target second sampling point.
- the second acquiring module is configured to:
- the prediction information is acquired according to the direction coefficient, and the prediction information includes direction coefficient information indicating the direction coefficient.
- the second acquiring module is configured to:
- the coefficient of the preset function obtained by fitting is taken as the direction coefficient.
- the seventh possible implementation in the third aspect In the mode, the second obtaining module is configured to:
- the second acquiring module is configured to:
- the direction coefficients of the at least two encoded motion vector field blocks adjacent to the current motion vector field block in the current motion vector field are used as The direction coefficient of the current motion vector field block.
- the second acquiring module is configured to:
- a ratio of a first component of a motion vector of the one sampling point to a second component of a motion vector of the one sampling point is used as a candidate for the candidate direction coefficient set Direction coefficient;
- a fourth aspect of the embodiments of the present invention provides a decoding apparatus, including:
- a first acquiring module configured to acquire prediction information and a prediction residual signal of a current motion vector field block, where the current motion vector field block is obtained by dividing a current motion vector field, where the current motion vector field is time t a motion vector field corresponding to the video frame;
- a second acquiring module configured to acquire, according to the prediction information, a prediction signal of the current motion vector field block
- a calculation module configured to calculate a reconstruction signal of the current motion vector field block according to the prediction signal acquired by the second acquisition module and the prediction residual signal acquired by the first acquisition module.
- the prediction information includes the information for indicating a first reference motion vector field of the motion vector field block
- the second obtaining module is configured to:
- the first reference motion vector field Acquiring, according to the prediction information, the first reference motion vector field, where the first reference motion vector field is a motion vector field of a video frame at time t1;
- a motion vector field block of the second reference motion vector field Acquiring a motion vector field block of the second reference motion vector field, wherein a coordinate range of the motion vector field block of the second reference motion vector field in the second reference motion vector field and the current motion vector field
- the block has the same coordinate range in the current motion vector field
- the prediction signal includes a motion vector field block of the second reference motion vector field.
- the second acquiring module is configured to:
- a motion vector of the second sampling point of the second reference motion vector field where a motion vector of the first sampling point of the first reference motion vector field; wherein, starting from a position of the first sampling point, a motion vector of the second sampling point is a position to which the displacement is moved The position of the second sampling point is the same position.
- the second acquiring module is configured to:
- a position of the second sampling point starts from a position of each of the at least two first sampling points of the first reference motion vector field, respectively Positioning the respective movement vectors of the at least two first sampling points as displacements, the positions moved to the same position, and the respective motion vectors of the at least two first sampling points are the at least two first sampling points respectively The product of the motion vector and (t-t1)/(t1-t2);
- a product of a weighted average of the motion vectors of the at least two first sampling points and (t-t1)/(t1-t2) is used as a motion vector of the second sampling point.
- the second acquiring module is configured to:
- the weighting value of the one second sampling point is used as a motion vector of the target second sampling point
- a weighted average of motion vectors of the at least two second sampling points is used as a motion vector of the target second sampling point.
- the prediction information includes direction coefficient information for indicating a direction coefficient of the current motion vector field block, where the direction coefficient is used to indicate Determining a relationship between a value of a first component of a motion vector of a sample point of the current motion vector field block and a value of a second component of the motion vector of the sample point;
- the second acquiring module is configured to acquire a reconstructed value of the first component, and calculate a predicted value of the second component according to the direction coefficient and a reconstructed value of the first component, where the prediction signal includes the The predicted value of the second component.
- the direction coefficient information includes a reconstructed motion vector field block in the current motion vector field Information, the direction coefficient includes a direction coefficient of the reconstructed motion vector field block;
- the direction coefficient information includes a value of the direction coefficient.
- the compression efficiency of the motion vector field is improved.
- FIG. 1 is a flow chart of an embodiment of a motion vector field encoding method of the present invention
- FIG. 3 is a flow chart of an embodiment of acquiring a prediction signal of the current block in the embodiment shown in FIG. 1;
- FIG. 4 is a flow chart of one embodiment of determining weights of motion vectors for respective first sampling points in the first set in the embodiment of FIG. 3;
- FIG. 5 is a flow chart of an embodiment of acquiring a prediction signal of the current block in the embodiment shown in FIG. 1;
- FIG. 6 is a flow chart showing an embodiment of acquiring a direction coefficient of a current block in the embodiment shown in FIG. 5;
- FIG. 7 is a flow chart showing another embodiment of acquiring a direction coefficient of a current block in the embodiment shown in FIG. 5;
- Figure 8 is a flow chart showing another embodiment of acquiring the direction coefficient of the current block in the embodiment shown in Figure 5;
- FIG. 9 is a flow chart of an embodiment of a motion vector field decoding method of the present invention.
- FIG. 10 is a schematic structural diagram of an embodiment of an encoding apparatus according to the present invention.
- FIG. 11 is a schematic structural diagram of an embodiment of a decoding apparatus according to the present invention.
- Figure 12 is a block diagram showing the structure of another embodiment of the encoding apparatus of the present invention.
- Figure 13 is a block diagram showing the structure of another embodiment of the decoding apparatus of the present invention.
- the motion vector field coding method provided by the embodiment of the present invention is described below.
- the execution body of the motion vector field encoding method provided by the embodiment of the present invention is an encoding device, wherein the encoding device may be any device that needs to output or store video, such as a notebook computer, a tablet computer, a personal computer, a mobile phone, or a video server. .
- a motion vector field coding method includes: acquiring an original signal of a current motion vector field block, wherein the current motion vector field block is obtained by dividing a current motion vector field by a block, The current motion vector field is a motion vector field corresponding to a video frame at time t; acquiring a prediction signal of the current motion vector field block and prediction information of the current motion vector field block, where the prediction information is used to indicate an acquisition location Deriving information required for predicting a signal; calculating, based on the prediction signal and the original signal, a prediction residual signal of the current motion vector field block, the prediction residual signal being used to indicate the original signal and the prediction a residual between the signals; writing the prediction information and the prediction residual signal to the code stream.
- FIG. 1 is a schematic flowchart of a motion vector field coding method according to an embodiment of the present invention.
- a motion vector field coding method according to an embodiment of the present invention may include: The following:
- a motion vector field is motion information of one image relative to another.
- transport The motion vector field is used to describe motion information of a target video frame relative to a reference video frame of the target video frame, wherein the target video frame includes a plurality of image blocks, each image block having a corresponding matching block in the reference video frame.
- Each sampling point in the motion vector field is in one-to-one correspondence with each image block in the target video frame, and the value of each sampling point is a motion vector of the image block corresponding to the sampling point, wherein the motion vector is the image block relative to the image block.
- the image block is the displacement information of the matching block in the reference video frame.
- the motion vector field is divided into different motion vector field blocks, and the motion vector field is compressed by encoding each motion vector field block. Compression coding, wherein one motion vector field block includes at least one sample point.
- the current motion vector field block to be compressed is referred to as a current block
- the motion vector field in which the current block is located is referred to as a current field.
- each of the motion vector field blocks and the video frame corresponding to the motion vector location do not necessarily correspond to each other.
- the method of blocking the motion vector field reference may be made to the method of blocking the video frame, which is not limited herein.
- intra prediction modes of video frames are currently provided in the HEVC standard, wherein the intra prediction mode of 35 includes 33 directional prediction modes, and Intra_DC and Intra_Planar modes.
- the intra prediction mode is applied to the intra prediction of the current field.
- the at least one motion vector field block that is encoded and reconstructed adjacent to the current block on the current field is used as a reference motion vector field block of the current block; according to the intra prediction mode and The reference motion vector field block acquires a prediction signal of the current block.
- the motion vector field block adjacent to the current block may be a motion vector field block adjacent to the motion vector field block (ie, connected to the motion vector field block), or may be preset from the current block.
- the motion vector field block of the numerical motion vector field block is not limited herein. In practical applications, the coding order of each motion vector field block in the current field is from left to right and top to bottom. Therefore, adjacent, encoded, and reconstructed motion vector field blocks located at the left, bottom, top, or top right of the current block are generally selected as reference motion vector field blocks.
- the taken intra prediction mode is the horizontal prediction mode of the 33 directional prediction modes
- the reference motion vector field block of the current block is the first motion vector field block on the left side on the same line as the current block.
- the reconstructed signal of the reference motion vector field block is used as the prediction signal of the current block.
- the acquired intra prediction mode is an Intra_DC mode. After acquiring the reference motion vector field block of the current block, the reconstructed pixel average value of the reference motion vector field block is used as the prediction signal of the current block.
- the prediction information is an index of the intra prediction mode and an index of the reference motion vector field block.
- the prediction information may not include an index of the reference motion vector field block.
- the encoding device and the decoding device pre-determine the position of the reference motion vector field block used by the current block corresponding to each intra prediction mode with respect to the current block.
- the encoding apparatus and the decoding apparatus further predetermine a method of calculating a prediction signal corresponding to each intra prediction mode. In this way, after receiving the prediction information, the decoding device calculates the prediction signal by using a pre-made calculation method according to the prediction mode in the prediction information and the index of the reference motion vector field block.
- an intra prediction mode when acquiring the prediction signal of the current block, an intra prediction mode may be directly determined, and the intra prediction mode is used to calculate a prediction signal of the current block, and the index of the intra prediction mode is included in the prediction information. Inside. Alternatively, it is also possible to traverse each intra prediction mode, calculate the prediction signal of the current block by using each intra prediction mode, and compare the original signal with the current block (that is, the prediction residual signal mentioned below). The index of the intra prediction mode corresponding to the energy-predicted signal is included in the prediction information, and the prediction signal is used to calculate a subsequent prediction residual signal.
- the prediction residual signal is used to indicate a difference between the original signal and the prediction signal, wherein the prediction signal is a prediction signal acquired according to prediction information. After obtaining the prediction signal of the current block, calculating the difference between the original signal and the prediction signal of the current block, the prediction residual signal of the current block is obtained.
- the decoding device can predict the current block according to the prediction information, to obtain a pre-predetermined block
- the measured signal, combined with the prediction residual signal of the current block can calculate the original signal of the current field. Therefore, in the encoding apparatus, when the current block is compression-coded, it is only necessary to transmit the prediction information and the prediction residual signal to the decoding device, so that the decoding device acquires the original signal of the current block.
- the encoding of the prediction residual signal may refer to the encoding of the prediction residual signal of the video frame in the video standard.
- the prediction residual signal is first compressed, and then the compressed data is written into the code stream.
- Lossless compression means that after compression, the reconstructed motion vector field signal is exactly the same as the original signal, and there is no loss of information.
- Lossy compression means that after compression, the reconstructed motion vector field signal is not exactly the same as the original signal, and there is a certain information loss.
- the process of lossless compression may include transform and entropy coding.
- the process of lossy compression can include transform, quantization, and entropy coding. This is a prior art and will not be described here.
- the prediction information and the prediction residual signal are encoded, the amount of information to be encoded is greatly reduced, and the motion vector is improved.
- the information and prediction residual signals can be highly restored to the original signal of the current block.
- the method of intra-field prediction may be adopted, that is, the current block is predicted according to the current field. Since there is a certain correlation between the current block and the spatially adjacent motion vector field, the current block can be predicted according to the intra-field prediction method.
- intra-field prediction methods include angle prediction and intra-area partition prediction.
- the method of angle prediction may acquire the prediction signal of the current block according to the intra prediction mode and the reference motion vector field block of the current block described in the explanation of step 102.
- the intra-area partition prediction method is specifically: dividing the current block into at least two regions, and acquiring a motion vector in each region as a prediction signal of the region. Therefore, in the intra-area partition prediction method, the prediction information includes information of the region division method and a method of determining a prediction signal for each region. Legal information.
- the information of the area dividing method is used to indicate the area dividing method, for example, an index of the area dividing method.
- the information of the method of determining the prediction signal for each region is used to indicate a method of determining a prediction signal for each region, such as an index of a method for determining a prediction signal for each region.
- the prediction information may not include the information of the method of determining the prediction signal of each region, but the encoding device and the decoding device store the same predetermined method for determining the prediction signal of each region. There are no restrictions here.
- an average value of motion vectors of all sampling points in one region may be used as a prediction signal of the region, or one of the regions may be used.
- the motion vector of the sampling point is used as a prediction signal for the region, or may be other, and is not limited herein.
- the motion vector of one of the sampling points in the region is taken as the prediction signal of the region, all the sampling points in the region may be traversed once, and the motion vector of one sampling point that minimizes the energy of the prediction residual signal is determined as Prediction signal.
- the current block is first sliced into two regions. Then, at least one of the two regions is divided into two regions, and then continues until the preset condition is satisfied, and the segmentation of the region is stopped.
- the preset condition has various settings.
- the distortion value of the current block after each segmentation can be calculated, and the distortion value is the difference between the predicted signal and the original signal of each region in the current block after the segmentation.
- the maximum value in the middle when the distortion value is less than the preset value, the preset condition is satisfied.
- the above is only an example description of the preset conditions, and is not limited.
- the preset value may be set in advance, and after each division, the number of regions into which the current block is divided is calculated, and when the number reaches a preset value, the preset condition is satisfied.
- one of the regions or two of the regions may have a trapezoidal shape or a triangular shape.
- shape of the region may also be other shapes, which are not limited herein.
- each partitioning method of the region is traversed, and prediction signals of two sub-regions in the region are calculated according to each segmentation method, and according to The prediction signals of the two sub-regions are used to determine an optimal segmentation method.
- the rate distortion optimization principle can be used to determine an optimal segmentation method.
- the current block when the current block is divided into different regions, the current block may be continuously segmented, or discretely segmented. Continuous and discrete cuts are explained below in conjunction with FIG.
- the continuous segmentation refers to directly dividing the current block S into two regions P1 and P2 by using a straight line L.
- the discrete segmentation means that the current block S is composed of a plurality of pixel blocks, and when segmented The current block is sliced along the edge of the pixel block in the current field, and the current block S is sliced into two regions P1 and P2.
- the current block when the current block is divided into different regions, the current block may be divided into contours, that is, the current block is divided according to the contour of the object represented by the image on the current block, which is not limited herein.
- the method of inter-field prediction may be adopted, that is, the current block is predicted by using a reference motion vector field according to the correlation between the current block and the temporally adjacent motion vector field, wherein the reference motion vector field refers to Other motion vector fields that are adjacent to the current field time.
- the adjacent motion vector field may be a motion vector field adjacent to the current field (that is, a motion vector field of the next or previous video frame of the video frame corresponding in time to the current field), There may be at least one motion vector field (i.e., a motion vector field corresponding to a video frame in which at least one video frame is temporally separated from a video frame corresponding to the current field) from the current field.
- a motion vector field i.e., a motion vector field corresponding to a video frame in which at least one video frame is temporally separated from a video frame corresponding to the current field
- Embodiment 1 Since the motion of the object has a certain consistency in time, the motion vector field has a certain correlation in time, that is, at least part of the current block appears in the reference motion vector field, but the current block The position in the current field and the position in the reference motion vector field are not necessarily the same.
- the position of a motion vector field block in a motion vector field refers to the range of coordinates of the motion vector field block in the motion vector field. Then, the position of the motion vector field block p in the motion vector field P is the same as the position of the motion vector field block q in the motion vector field Q, and refers to the coordinate range and motion of the motion vector field block p in the motion vector field P.
- the vector field block q has the same coordinate range in the motion vector field Q.
- acquiring the prediction signal of the current block specifically includes: determining a reference motion vector field of the current block, searching for a matching block of the current block on the reference motion vector field, and performing the matching block
- the reconstructed signal is used as a predictive signal for the current block.
- There are various methods for finding matching blocks for example, traversing each motion vector field block on the reference motion vector field, and calculating the motion vector field block
- the difference from the current block is that the motion vector field block with the smallest difference from the current block is used as the matching block of the current block.
- Obtaining the prediction information of the current block specifically includes: using information of the reference motion vector field and information of the matching block as the prediction information, where information of the reference motion vector field is used to indicate the reference motion
- the vector field the information of the matching block is used to indicate the matching block.
- the information of the reference motion vector field may be an index of the reference motion vector field
- the information of the matching block may be a position of the matching block relative to a position of the first motion vector field block in the reference motion vector field.
- Displacement information wherein the position of the first motion vector field block in the reference motion vector field is the same as the position of the current block on the current field; or the information of the matching block may also be an index of the matching block, which is not used herein. limit.
- Embodiment 2 In this embodiment, if the motion state of the same object captured in the video sequence remains unchanged in a short time, that is, the motion direction and size are unchanged, the current block can be derived according to the reference motion vector field. Predictive signal.
- acquiring the prediction signal of the current block specifically includes:
- the first reference motion vector field is a coded and reconstructed motion vector field adjacent to the current field.
- the video frame corresponding to the current field is referred to as a video frame at time t
- the video frame corresponding to the first reference motion vector field is referred to as a video frame at time t1.
- the time t1 may be before the time t or after the time t, and is not limited herein.
- the motion vector field and the video frame to be described will be explained first: the position of the target object in the video frame at time t1 is A, and the reference video frame used for inter prediction in the video frame is t2.
- the displacement of the target object during t-t1 should be That is, if the position in the video frame at the time t of the target object is C, then the displacement from position A to position C should be
- each sample point in the first reference motion vector field is regarded as a target object, and the position to which each sample point is moved at time t can be derived.
- a new motion vector field formed by moving each sample point in the first reference motion vector field according to the above rule and changing the motion vector is referred to as a second reference motion vector field.
- each sampling point in the first reference motion vector field when each sampling point in the first reference motion vector field is moved to obtain the second reference motion vector field, at least two sampling points in the first reference motion vector field may be moved to the motion vector at time t. In the same position on the field.
- each sampling point in the first reference motion vector field keeps the current speed and direction unchanged, and the first reference motion vector may appear when the motion vector field formed at time t (ie, the second reference motion vector field)
- the sampling points of the position in the second reference motion vector field have various values, for example, the motion vector of one of the sampling points can be taken (t- The product of t1)/(t1-t2) is taken as the motion motion vector of the sampling point at the position.
- the motion vector of the position is determined as follows:
- a position of the second sampling point starts from a position of each of the at least two first sampling points of the first reference motion vector field, respectively Positioning the respective movement vectors of the at least two first sampling points as displacements, the positions moved to the same position, and the respective motion vectors of the at least two first sampling points are the at least two first sampling points respectively The product of the motion vector and (t-t1)/(t1-t2).
- a product of a weighted average of the motion vectors of the at least two first sampling points and (t-t1)/(t1-t2) is used as a motion vector of the second sampling point.
- the second sampling point is referred to as a target second sampling point
- at least two first sampling points of the first reference motion vector field are referred to as A collection.
- the weights of the motion vectors of the first sampling points in the first set may be preset to be equal, that is, the first in the first set
- the average of the motion vectors of one sample point is taken as the motion vector of the target second sample point.
- determining the weights of the motion vectors of the first sampling points in the first set specifically includes:
- At least one second sampling point located around the second sampling point of the target is referred to as a second set, and each second sampling point is an element of the second set.
- the second set may include at least one of four second sampling points located around the target second sampling point and adjacent to the target second sampling point.
- the degree of similarity between the motion vector of the first sampling point and the motion vector of each sampling point in the second set is calculated.
- the degree of similarity For example, the difference between the motion vector of the first sampling point and the motion vector of each element in the second set may be calculated, and the sum or average value of each difference is used as the motion vector of the first sampling point and the second.
- the weights of the motion vectors of the elements in the first set After determining the similarity degree of the motion vectors of the elements in the first set, determining the weights of the motion vectors of the elements in the first set according to the magnitude of the similarity, wherein the weight of the motion vector of the elements with higher similarity The bigger the number. Specifically, after the weights corresponding to the different rankings are set in advance, and the ranking of the similarity degree of each element in the first set is determined, the weight corresponding to the ranking of the element is taken as the weight of the motion vector of the element.
- a special position may also appear on the second reference motion vector field, wherein no sample point in the first reference motion vector field moves to the special position at time t.
- the weighting value of the one second sampling point is used as a motion vector of the target second sampling point
- a weighted average of motion vectors of the at least two second sampling points is used as a motion vector of the target second sampling point.
- the at least one second sample point is hereinafter referred to as a third set.
- the weights of the motion vectors of the second sampling points in the third set may be equal, that is, the second in the third set.
- the average of the motion vectors of the sample points is taken as the motion vector of the target second sample point.
- determining the weights of the motion vectors of the second sampling points in the third set specifically includes:
- the weighted average of the motion vectors of the second sampling points in the third set is the motion vector of the second sampling point.
- a second sampling point closest to the left side of the second sampling point of the target (the motion vector is ) the distance from the second sampling point of the target is m
- the second sampling point closest to the right side of the second sampling point of the target is n
- the motion vector of the target motion vector is
- the above is merely an example and is not limiting.
- the motion vector field block of the second reference motion vector field is in the second reference motion vector
- the coordinate range in the field is the same as the coordinate range of the current motion vector field block in the current motion vector field.
- the second reference motion vector field is the predicted motion vector field at time t, that is, the second reference motion vector field is the prediction signal of the current field. Since the prediction methods adopted by different blocks in the current field are not all of the methods described in this embodiment, when the current block samples the method described in this embodiment, the second reference motion vector field is located at the current block. The signal of the motion vector field block at the region serves as the prediction signal for the current block.
- the decoding device can be obtained by simply using the information of the first reference motion vector field as prediction information.
- the predicted signal of the current block is calculated.
- the information of the first reference motion vector field block is used to indicate the first reference motion vector field.
- the information of the first reference motion vector field is an index of the first reference motion vector field.
- the prediction information of the current block includes only the information of the first reference motion vector field, the number of bits required for the current block code is greatly reduced.
- motion vectors can also be replaced with one of the components of the motion vector.
- the method of motion vector field component prediction may be adopted, that is, the other component is predicted according to the direction coefficient of the current block and one component of the motion vector of each sample point in the current block.
- the motion vector includes direction and size, which can be decomposed into horizontal and vertical components.
- the angle between the motion vector and the horizontal direction is ⁇ , and then the magnitudes of the components of the motion vector in the horizontal direction and the vertical direction are respectively This can be launched, as well as
- the encoding device generally stores the motion vector of the sample point by storing the horizontal component and the vertical component of the motion vector of each sample point.
- the prediction signal of the other component of the motion vector is calculated by the magnitude of one component of the motion vector and the relationship between the component and the other component.
- obtaining the prediction signal of the current block specifically includes the following steps:
- the motion vector of the sample point can be decomposed into a vertical component and a horizontal component.
- a first component one of the vertical component and the horizontal component of the motion vector
- the other component is referred to as a second component of the motion vector.
- the current block may be decomposed into a first component block and a second component block, wherein the first component block includes a first component of each sampling point in the current block, and the second component block includes The second component of each sample point in the current block.
- the direction coefficient of the current block is used to indicate a relationship between the value of the first component of each sampling point and the value of the second component, that is, when the current block is predicted, it is assumed that the first of all the sampling points in the current block
- the functional relationship between the component and the second component is the same.
- the first component block when the current block is compressed, compression of the first component block and the second component block of the current block is included.
- the first component block may be encoded by the method in the embodiment shown in FIG. 1, or the method of intra-field prediction or inter-field prediction described above, which is not limited herein.
- the predicted value of each sampling point in the second component block may be the first component of the sampling point. Calculated with the direction factor.
- the decoding means calculates the predicted value of the second component of the sampling point based on the direction coefficient and the reconstructed value of the first component of each sample point in the current block. Therefore, before the encoding device calculates the prediction signal of the current block, the direction coefficient and the reconstruction value of the first component of each sampling point in the current block are first acquired. It is noted that the coding device has a direction coefficient because the information amount of the direction coefficient is small. Generally, lossless coding is performed, so the encoding device does not need to acquire the reconstructed value of the direction coefficient, but directly samples the original value of the direction coefficient.
- the decoding end can obtain the reconstructed value of the first component, when the prediction signal of the current block includes the predicted value of the second component, the decoding end can reconstruct the predicted value and the first component according to the second component. The value gets the predicted signal of the current block.
- the direction coefficient of the current block is used as the direction coefficient of the sampling point, that is, the second component of the sampling point is calculated according to the first component of the sampling point and the direction coefficient of the current block.
- the prediction signal for each sample point in the current block includes the predicted value of the second component.
- the prediction information of the current block includes one direction coefficient, the number of bits required for the current block coding is small.
- Example 1 as shown in Figure 6, obtaining the direction coefficients of the current block includes:
- the first component of the motion vector of the at least two sampling points is used as an independent variable of the preset function
- the second component of the motion vector of the at least two sampling points is used as a function value corresponding to the independent variable.
- the independent variable and the function value are fitted, and the coefficient of the preset function obtained by the fitting is used as the direction coefficient.
- the motion vector of at least two sampling points in the current block is fitted, wherein the first component of the motion vector of each sampling point is used as an independent variable and a second component in the fitting.
- a function value of the preset function a function relationship between the first component and the second component of each sample point in the current block is obtained.
- each sampling point can be fitted to a straight line.
- k is the direction coefficient of the current block. This means that all points in the current block are moving in the same direction.
- a and b are the direction coefficients of the current block.
- the coefficient in the function equation corresponding to the curve is the direction coefficient of the current block.
- the direction coefficient information of the current motion vector field as part of the prediction information includes the value of the direction coefficient.
- the encoding device and the decoding device need to pre-determine the function equations corresponding to different coefficient numbers, so that the encoding device only needs to write the direction coefficients into the code stream, and the decoding device can according to the values included in the direction coefficients. The number determines the corresponding function equation.
- Example 2 As shown in FIG. 7, obtaining the direction coefficients of the current block includes:
- the first component of the motion vector of the at least two sampling points is used as an argument, and the second component of the motion vector of the at least two sampling points is used as a function value corresponding to the independent variable, and the self is The variable is fitted to the function value.
- the candidate prediction residual signal of the current motion vector field block corresponding to the candidate direction coefficient of the candidate direction coefficient set is taken, and the candidate direction coefficient corresponding to the candidate prediction residual signal with minimum signal energy minimum or rate distortion is used as The direction coefficient of the current motion vector field block.
- the coefficient of the fitting function is not directly used as the direction coefficient of the current block.
- the image corresponding to the current block may be the same object as the image corresponding to one of the coded blocks of all the coded blocks, then The direction coefficient of the current block may be the same as the direction coefficient of one of the encoded blocks.
- the direction coefficients of all the coded blocks are also obtained, and the coefficients of the fitting function and the direction coefficients of all the coded blocks are used as candidates for the candidate direction coefficient set of the current block.
- a direction coefficient, a candidate prediction signal of the current block and a candidate prediction residual signal corresponding to each candidate direction coefficient are calculated, and a candidate direction coefficient corresponding to the candidate prediction residual signal having the smallest capability is used as a direction coefficient of the current block.
- the direction coefficient information when the direction coefficient of the current block is a coefficient of the function, the direction coefficient information includes a value of the direction coefficient, when a direction coefficient of the current block is a direction of the coded block.
- the coefficient coefficient information is used to indicate the encoded block or the encoded block
- the value of the direction coefficient is not limited here.
- Example 3 Obtaining the direction coefficient of the current block includes:
- the direction coefficients of the at least two encoded motion vector field blocks adjacent to the current motion vector field block in the current motion vector field are used as The direction coefficient of the current motion vector field block.
- the direction coefficients of at least two coded blocks adjacent to the current block are the same, it may be inferred that the images of the at least two coded blocks belong to the same object, and the image of the current block and the at least two coded blocks are assumed The images belong to the same object, so it is directly determined that the direction coefficients of the current block are the same as the direction coefficients of the at least two coded blocks.
- the direction coefficient information of the current motion vector field is specifically used to indicate the coded block or a value including a direction coefficient of the coded block, for example, the direction coefficient information includes an index of the coded block. There are no restrictions here.
- Example 4 As shown in FIG. 8, obtaining the direction coefficients of the current block includes:
- a ratio of a first component of a motion vector of the one sampling point to a second component of a motion vector of the one sampling point is used as a candidate for the candidate direction coefficient set Direction coefficient;
- the direction coefficients of at least two encoded motion vector field blocks adjacent to the current motion vector field block in the current motion vector field are used as the direction coefficients of the current block.
- the image corresponding to each sample point in the current block may be the same object, and then the direction coefficient of the current block may be the same as the direction coefficient of one of the sample points.
- a motion vector of at least one sampling point in the original signal is further obtained, and a direction component of the encoded block and a first component of a motion vector of the at least one sampling point are compared with the at least An average of a ratio of a second component of a motion vector of one sample point as a candidate direction coefficient of the candidate direction coefficient set, or a direction coefficient of the encoded block and a first component of the motion vector and the The ratio of the second component of the motion vector is taken as the candidate direction coefficient of the candidate direction coefficient set.
- the direction coefficient information when the direction coefficient of the current block is a coefficient of the function, the direction coefficient information includes a value of the direction coefficient, when a direction coefficient of the current block is a direction of the coded block.
- the direction coefficient information is used to indicate the value of the coded block or the direction coefficient of the coded block, which is not limited herein.
- the method of acquiring the prediction signal and the prediction information adopted by the different motion vector field blocks there are various methods for determining the prediction signal and the prediction information used by the current block.
- an index corresponding to each acquisition method can be prepared in advance by the encoding device and the decoding device.
- the encoding device acquires the prediction signal and the prediction information of the current block, it traverses each of the acquisition methods and calculates the prediction residual signal in each of the acquisition methods, and the acquisition method corresponding to the prediction residual signal with the smallest energy is determined as the current The method of obtaining the block, and including the index of the obtaining method into the prediction information of the current block.
- the motion vector field encoding method of the embodiment of the present invention has been described above. The following is a description of the motion vector field decoding method provided by the embodiment of the present invention.
- the execution body of the motion vector field decoding method provided by the embodiment of the present invention is a decoding device, where the decoding device can be any video output that needs to be output and played. Devices such as mobile phones, laptops, tablets, personal computers, etc.
- a motion vector field decoding method includes: acquiring prediction information of a current motion vector field block and a prediction residual signal, wherein the current motion vector field block divides the current motion vector field by Obtaining, the current motion vector field is a motion vector field corresponding to the video frame at time t; acquiring a prediction signal of the current motion vector field block according to the prediction information; and according to the prediction signal and the prediction residual A difference signal is used to calculate a reconstruction signal of the current motion vector field block.
- FIG. 9 is a schematic flowchart of a motion vector field decoding method according to another embodiment of the present invention
- FIG. 9 is a motion vector field decoding method according to another embodiment of the present invention.
- Can include the following:
- the decoding device After receiving the video code stream, the decoding device decodes the video code stream to restore each video image in the original video sequence.
- the video frame is decoded by the reference frame of the video frame and the motion vector field of the video frame.
- the decoding device needs to first decode the reference frame of the video frame and the motion vector field.
- the motion vector field to be currently decoded is referred to as a current motion vector field.
- the current motion vector field block is obtained by dividing a current motion vector field, where the current motion vector field is a motion vector field corresponding to a video frame at time t.
- the reconstruction signal of the current motion vector field is obtained by sequentially reconstructing each motion vector field block in the current motion vector field.
- the prediction information of the current block and the prediction residual signal are first acquired from the video code stream.
- the content of the prediction information is different, and the method of acquiring the prediction signal of the current block according to the prediction information is also different.
- acquiring the prediction signal of the current motion vector field block according to the prediction information specifically includes: an index according to an intra prediction mode. Determining an intra prediction mode, determining a reference motion vector field block according to a reference motion vector field block index, and then acquiring a signal according to an intra prediction mode and a reference motion vector field block The prediction signal of the previous block.
- the encoding device and the decoding device pre-determine a method of calculating a prediction signal corresponding to each intra prediction mode. In this way, after receiving the prediction information, the decoding device calculates the prediction signal by using a pre-made calculation method according to the prediction mode in the prediction information and the index of the reference motion vector field block.
- the acquired intra prediction mode is the horizontal prediction mode in the 35 intra prediction modes of the video frame provided in the HEVC standard, and then the reconstructed signal of the reference motion vector field block of the current block is used as the prediction signal of the current block.
- the acquired intra prediction mode is the Intra_DC mode in the 35 intra prediction modes, and the reconstructed pixel average value of the reference motion vector field block is used as the prediction signal of the current block.
- the prediction information acquired by the decoding device may not include the index of the reference motion vector field block, and the decoding device and the encoding device pre-specify the reference motion vector field used by the current block corresponding to each intra prediction mode. The position of the block relative to the current block. In this way, after the decoding device acquires the prediction information, the reference motion vector field of the current block is determined according to the intra prediction mode in the prediction information.
- the prediction residual signal is used to indicate a difference between an original signal and a prediction signal of the current block. After the decoding device acquires the prediction signal of the current block, the prediction signal is corrected by the prediction residual signal, and the reconstructed signal of the current block is obtained.
- the prediction information is information required to acquire the prediction signal of the current block
- the prediction signal acquired by the decoding device according to the prediction information is the same as the prediction signal acquired by the encoding device, so that the decoding device is based on the prediction information and
- the prediction residual signal can highly restore the original signal of the current block.
- the prediction information includes information of a region division method and information of a method of determining a prediction signal for each region.
- the information of the area dividing method is used to indicate the area dividing method, for example, an index of the area dividing method.
- the information of the method of determining the prediction signal for each region is used to indicate a method of determining a prediction signal for each region, such as an index of a method for determining a prediction signal for each region.
- the area dividing method is determined according to the information of the area dividing method, and the current block is divided into different areas by using the area dividing method.
- a method of determining a prediction signal for each region is obtained based on the information of the method of determining the prediction signal of each region, and the prediction signal of each region is acquired by the method.
- the information of the method of determining the prediction signal for each region indicates that the prediction signal of the region is the average of the motion vectors of all the sampling points in the region. Then, when the prediction signal of the region is acquired, the average value of the motion vectors of all the sampling points in the region is calculated, and the average value is used as the prediction signal of the region.
- the information of the method of determining the prediction signal of each region indicates that the prediction signal of the region is a motion vector of one of the sampling points. Then, when acquiring the prediction signal of the region, the motion vector of the sampling point is obtained according to the index of the sampling point, and the motion vector of the sampling point is used as the prediction signal of the region.
- the prediction information may not include the information of the method of determining the prediction signal of each region, but the encoding device and the decoding device store the same predetermined method for determining the prediction signal of each region. There are no restrictions here.
- the prediction information includes information of a reference motion vector field and information of the matching block, where information of the reference motion vector field is used to indicate the reference motion vector field, and information of the matching block is used to indicate Said matching block.
- the information of the reference motion vector field may be an index of the reference motion vector field
- the information of the matching block may be a position of the matching block relative to a position of the first motion vector field block in the reference motion vector field.
- Displacement information wherein the position of the first motion vector field block in the reference motion vector field is the same as the position of the current block on the current field; or the information of the matching block may also be an index of the matching block, which is not used herein. limit.
- the information of the motion vector field is determined by the reference motion vector field, and the matching block is searched in the reference motion vector field according to the information of the matching block, and the reconstructed signal of the matching block is used as the prediction signal of the current block.
- the prediction information includes the information for indicating a first reference motion vector field of the motion vector field block.
- the first reference motion vector field Acquiring, according to the prediction information, the first reference motion vector field, where the first reference motion vector field is a motion vector field of a video frame at time t1;
- a motion vector field block of the second reference motion vector field Acquiring a motion vector field block of the second reference motion vector field, wherein a coordinate range of the motion vector field block of the second reference motion vector field in the second reference motion vector field and the current motion vector field
- the block has the same coordinate range in the current motion vector field
- the prediction signal includes a motion vector field block of the second reference motion vector field.
- the motion vector field and the video frame to be described will be explained below:
- the position of the target object in the video frame at time t1 is A
- the video frame is used for inter prediction.
- the reference video frame is a video frame at time t2, wherein the position of the target object in the video frame at the time t2 is B.
- the motion vector of the corresponding first sampling point of the target object in the first reference motion vector field Used to indicate the displacement of position B to position A.
- the displacement of the target object during t-t1 should be That is, if the position in the video frame at the time t of the target object is C, then the displacement from position A to position C should be
- each sample point in the first reference motion vector field is regarded as a target object, and the position to which each sample point is moved at time t can be derived.
- a new motion vector field formed by moving each sample point in the first reference motion vector field according to the above rule and changing the motion vector is referred to as a second reference motion vector field.
- the acquiring the second reference motion vector field according to the first reference motion vector field, the t time, the t1 time, and the t2 time specifically includes:
- a motion vector of the second sampling point of the second reference motion vector field where a motion vector of the first sampling point of the first reference motion vector field; wherein, starting from a position of the first sampling point, a motion vector of the second sampling point is a position to which the displacement is moved The position of the second sampling point is the same position.
- each sampling point in the first reference motion vector field when each sampling point in the first reference motion vector field is moved to obtain the second reference motion vector field, at least two sampling points in the first reference motion vector field may be moved to the motion vector at time t. In the same position on the field.
- each sampling point in the first reference motion vector field keeps the current speed and direction unchanged, and the first reference motion vector may appear when the motion vector field formed at time t (ie, the second reference motion vector field)
- the sampling points of the position in the second reference motion vector field have various values, for example, the motion vector of one of the sampling points can be taken (t- The product of t1)/(t1-t2) is taken as the motion motion vector of the sampling point at the position.
- the acquiring the second reference motion vector field according to the first reference motion vector field, the t time, the t1 time, and the t2 time specifically:
- a position of the second sampling point starts from a position of each of the at least two first sampling points of the first reference motion vector field, respectively Positioning the respective movement vectors of the at least two first sampling points as displacements, the positions moved to the same position, and the respective motion vectors of the at least two first sampling points are the at least two first sampling points respectively The product of the motion vector and (t-t1)/(t1-t2);
- a product of a weighted average of the motion vectors of the at least two first sampling points and (t-t1)/(t1-t2) is used as a motion vector of the second sampling point.
- the second sampling point is referred to as a target second sampling point, and at least two first sampling points of the first reference motion vector field are referred to as a first set.
- the weights of the motion vectors of the first sampling points in the first set may be preset to be equal, that is, the first in the first set
- the average of the motion vectors of one sample point is taken as the motion vector of the target second sample point.
- determining the weights of the motion vectors of the first sampling points in the first set specifically includes:
- At least one second sampling point located around the second sampling point of the target is referred to as a second set, and each second sampling point is an element of the second set.
- the second set may include at least one of four second sampling points located around the target second sampling point and adjacent to the target second sampling point.
- the degree of similarity between the motion vector of the first sampling point and the motion vector of each sampling point in the second set is calculated.
- the degree of similarity For example, the difference between the motion vector of the first sampling point and the motion vector of each element in the second set may be calculated, and the sum or average value of each difference is used as the motion vector of the first sampling point and the second.
- S73 Determine, according to the degree of similarity, a weight of a motion vector of each first sampling point in the first set, where a weight of a motion vector of the first sampling point that is more similar to a motion vector of the second set is more Big.
- the weights of the motion vectors of the elements in the first set After determining the similarity degree of the motion vectors of the elements in the first set, determining the weights of the motion vectors of the elements in the first set according to the magnitude of the similarity, wherein the weight of the motion vector of the elements with higher similarity The bigger the number. Specifically, after the weights corresponding to the different rankings are set in advance, and the ranking of the similarity degree of each element in the first set is determined, the weight corresponding to the ranking of the element is taken as the weight of the motion vector of the element.
- a special position may also appear on the second reference motion vector field, wherein no sample point in the first reference motion vector field moves to the special position at time t.
- the acquiring the second reference motion vector field according to the first reference motion vector field, the t time, the t1 time, and the t2 time specifically includes:
- the weighting value of the one second sampling point is used as a motion vector of the target second sampling point
- a weighted average of motion vectors of the at least two second sampling points is used as a motion vector of the target second sampling point.
- the prediction information includes direction coefficient information indicating a direction coefficient of the current motion vector field block, where the direction coefficient is used to indicate a first component of a motion vector of a sampling point of the current motion vector field block. The relationship between the value and the value of the second component of the motion vector of the sample point.
- the direction coefficient information includes information indicating a reconstructed motion vector field block in the current motion vector field, the direction coefficient including a direction coefficient of the reconstructed motion vector field block; or, the direction The coefficient information includes the value of the direction coefficient.
- an encoding apparatus includes:
- the first obtaining module 1001 is configured to acquire an original signal of a current motion vector field block, where the current motion vector field block is obtained by dividing a current motion vector field, where the current motion vector field is a video frame corresponding to time t Motion vector field
- a second obtaining module 1002 configured to acquire a prediction signal of the current motion vector field block and prediction information of the current motion vector field block, where the prediction information is used to indicate information required to acquire the prediction signal;
- the calculating module 1003 is configured to calculate, according to the prediction signal acquired by the second acquiring module and the original signal acquired by the first acquiring module, a prediction residual signal of the current motion vector field block, where the prediction a residual signal is used to indicate a residual between the original signal and the predicted signal;
- the encoding module 1004 is configured to write the prediction information acquired by the second obtaining module and the prediction residual signal calculated by the computing module into a code stream.
- the encoding apparatus when the encoding apparatus encodes the current block, since the original signal of the current motion vector field block is not required to be encoded, but the prediction information and the prediction residual signal are encoded, the compression efficiency of the motion vector field is improved. .
- the second obtaining module 1002 is configured to:
- the at least one motion vector field block that is encoded and reconstructed adjacent to the current motion vector field block on the current motion vector field is used as a reference motion vector field block of the current block; according to the intra prediction
- the mode and the reference motion vector field block acquire a prediction signal of the current block.
- the acquired intra prediction mode is a horizontal prediction mode among 33 directional prediction modes
- the reference motion vector field block of the current block is the first motion vector field block on the left side on the same line as the current block.
- the second obtaining module 1002 is configured to use the reconstructed signal of the reference motion vector field block as the prediction signal of the current block.
- the acquired intra prediction mode is an Intra_DC mode
- the second obtaining module 1002 is configured to use the reconstructed pixel average value of the reference motion vector field block as the prediction signal of the current block.
- the second obtaining module 1002 is configured to:
- first reference motion vector field of the current motion vector field block where the first reference motion vector field is an encoded and reconstructed motion vector field, wherein the first reference motion vector field is a video frame at time t1
- the video frame at the time t1 is a video frame adjacent to the video frame at the time t;
- the prediction signal includes a motion vector field block of the second reference motion vector field, where a motion vector field block of the second reference motion vector field is a coordinate range in the second reference motion vector field is the same as a coordinate range of the current motion vector field block in the current motion vector field;
- the prediction information includes the information used to indicate the first reference motion vector field.
- the second acquisition mode 1002 is used according to a calculation formula. Calculating a motion vector of the second sampling point of the second reference motion vector field, where a motion vector of the first sampling point of the first reference motion vector field; wherein, with the position of the first sampling point as a starting point, a position moved by the motion vector of the second sampling point as a displacement The position of the second sampling point is the same position.
- the second acquisition mode 1002 is configured to determine a second sampling point of the second reference motion vector field, where the second sampling point is located and a position of each of the at least two first sampling points of the first reference motion vector field is a starting point, and a displacement vector of each of the at least two first sampling points is a displacement, and a position moved to the same position, the at least two The respective motion vectors of the first sampling points are the product of the motion vectors of the at least two first sampling points and (t-t1)/(t1-t2);
- a product of a weighted average of the motion vectors of the at least two first sampling points and (t-t1)/(t1-t2) is used as a motion vector of the second sampling point.
- the second acquisition modulo 1002 is configured to acquire at least one second sampling point adjacent to a target second sampling point of the second reference motion vector field, where Position of any one of the first sampling points of the first reference motion vector field as a starting point For displacement, the position moved to is different from the position of the second sampling point of the target. a motion vector of the first sampling point;
- the weighting value of the one second sampling point is used as a motion vector of the target second sampling point
- a weighted average of motion vectors of the at least two second sampling points is used as a motion vector of the target second sampling point.
- the second acquisition module 1002 is configured to:
- the prediction information is acquired according to the direction coefficient, and the prediction information includes direction coefficient information indicating the direction coefficient.
- the second acquisition module 1002 is configured to:
- the coefficient of the preset function obtained by fitting is taken as the direction coefficient.
- the second acquisition module 1002 is configured to:
- the second acquisition module 1002 is configured to:
- At least two of the current motion vector fields adjacent to the current motion vector field block When the direction coefficients of the code motion vector field block are the same, the direction coefficients of the at least two coded motion vector field blocks are used as the direction coefficients of the current motion vector field block.
- the second acquisition module 1002 is configured to:
- a decoding apparatus provided by an embodiment of the present invention includes:
- the first obtaining module 1101 is configured to acquire prediction information and a prediction residual signal of the current motion vector field block, where the current motion vector field block is obtained by dividing the current motion vector field, where the current motion vector field is t a motion vector field corresponding to the video frame of the moment;
- a second acquiring module 1102 configured to acquire, according to the prediction information, a prediction signal of the current motion vector field block
- the calculation module 1103 is configured to calculate a reconstruction signal of the current motion vector field block according to the prediction signal acquired by the second acquisition module and the prediction residual signal acquired by the first acquisition module. number.
- the prediction information includes the information for indicating a first reference motion vector field of the motion vector field block; the second obtaining module 1102 is configured to:
- the first reference motion vector field Acquiring, according to the prediction information, the first reference motion vector field, where the first reference motion vector field is a motion vector field of a video frame at time t1;
- a motion vector field block of the second reference motion vector field Acquiring a motion vector field block of the second reference motion vector field, wherein a coordinate range of the motion vector field block of the second reference motion vector field in the second reference motion vector field and the current motion vector field
- the block has the same coordinate range in the current motion vector field
- the prediction signal includes a motion vector field block of the second reference motion vector field.
- the second acquisition module 1202 is configured to:
- a motion vector of the second sampling point of the second reference motion vector field where a motion vector of the first sampling point of the first reference motion vector field; wherein, starting from a position of the first sampling point, a motion vector of the second sampling point is a position to which the displacement is moved The position of the second sampling point is the same position.
- the second acquisition module 1202 is configured to:
- a position of the second sampling point starts from a position of each of the at least two first sampling points of the first reference motion vector field, respectively Positioning the respective movement vectors of the at least two first sampling points as displacements, the positions moved to the same position, and the respective motion vectors of the at least two first sampling points are the at least two first sampling points respectively The product of the motion vector and (t-t1)/(t1-t2);
- a product of a weighted average of the motion vectors of the at least two first sampling points and (t-t1)/(t1-t2) is used as a motion vector of the second sampling point.
- the second acquisition module 1202 is configured to:
- the weighting value of the one second sampling point is used as a motion vector of the target second sampling point
- a weighted average of motion vectors of the at least two second sampling points is used as a motion vector of the target second sampling point.
- the prediction information includes direction coefficient information indicating a direction coefficient of the current motion vector field block, the direction coefficient is used to indicate sampling of the current motion vector field block a relationship between a value of a first component of a motion vector of a point and a value of a second component of a motion vector of the sampling point;
- the second obtaining module 1102 is configured to acquire a reconstructed value of the first component, and calculate a predicted value of the second component according to the direction coefficient and a reconstructed value of the first component, where the prediction signal includes the The predicted value of the second component.
- the direction coefficient information includes information indicating a reconstructed motion vector field block in the current motion vector field, the direction coefficient including the reconstructed motion vector field block The direction coefficient; or the direction coefficient information includes the value of the direction coefficient.
- FIG. 12 is a block diagram showing the structure of an encoding apparatus 1200 according to another embodiment of the present invention.
- the encoding device 1200 can include at least one processor 1201, a memory 1205, and at least one communication bus 1202.
- the encoding device 1200 may further include: at least one network interface 1204 and/or a user interface 1203.
- the user interface 1203 includes, for example, a display (eg, a touch screen, an LCD, a Holographic, a CRT, or a Projector), a pointing device (such as a mouse or a trackball touch panel or a touch screen, etc.), a camera, and/or Or a pickup device, etc.
- the memory 1205 may include a read only memory and a random access memory, and provides instructions and data to the processor 1201. A portion of the memory 1205 may also include a non-volatile random access memory.
- the memory 1205 stores the following elements, executable modules or data structures, or a subset thereof, or their extended set:
- the operating system 12051 includes various system programs for implementing various basic services and processing bases. The task of hardware.
- the application module 12052 includes various applications for implementing various application services.
- the processor 1201 by invoking a program or instruction stored in the memory 1205, the processor 1201 is configured to:
- the prediction information and the prediction residual signal are written to a code stream.
- the compression efficiency of the motion vector field is improved.
- the acquiring the prediction signal of the current motion vector field block and the prediction information of the current motion vector field block including:
- first reference motion vector field of the current motion vector field block where the first reference motion vector field is an encoded and reconstructed motion vector field, wherein the first reference motion vector field is a video frame at time t1
- the video frame at the time t1 is a video frame adjacent to the video frame at the time t;
- the prediction signal includes a motion vector field block of the second reference motion vector field, where a motion vector field block of the second reference motion vector field is a coordinate range in the second reference motion vector field is the same as a coordinate range of the current motion vector field block in the current motion vector field;
- the prediction information including the Information for indicating the first reference motion vector field.
- the acquiring the second reference motion vector field according to the first reference motion vector field, the t time, the t1 time, and the t2 time includes:
- the acquiring the second reference motion vector field according to the first reference motion vector field, the t time, the t1 time, and the t2 time includes:
- a position of the second sampling point starts from a position of each of the at least two first sampling points of the first reference motion vector field, respectively Positioning the respective movement vectors of the at least two first sampling points as displacements, the positions moved to the same position, and the respective motion vectors of the at least two first sampling points are the at least two first sampling points respectively The product of the motion vector and (t-t1)/(t1-t2);
- a product of a weighted average of the motion vectors of the at least two first sampling points and (t-t1)/(t1-t2) is used as a motion vector of the second sampling point.
- the acquiring the second reference motion vector field according to the first reference motion vector field, the t time, the t1 time, and the t2 time includes:
- the weighting value of the one second sampling point is used as a motion vector of the target second sampling point
- a weighted average of motion vectors of the at least two second sampling points is used as a motion vector of the target second sampling point.
- the acquiring the prediction signal of the current motion vector field block and the prediction information of the current motion vector field block including:
- Obtaining a direction coefficient of the current motion vector field block wherein the direction coefficient is used to indicate a relationship between a value of a first component of a motion vector of a sampling point of a current motion vector field block and a value of a second component of a motion vector of the sampling point;
- the prediction information is acquired according to the direction coefficient, and the prediction information includes direction coefficient information indicating the direction coefficient.
- the acquiring a direction coefficient of the current motion vector field block includes:
- the coefficient of the preset function obtained by fitting is taken as the direction coefficient.
- the acquiring a direction coefficient of the current motion vector field block includes:
- the acquiring a direction coefficient of the current motion vector field block includes:
- the direction coefficients of the at least two encoded motion vector field blocks adjacent to the current motion vector field block in the current motion vector field are used as The direction coefficient of the current motion vector field block.
- the acquiring a direction coefficient of the current motion vector field block includes:
- FIG. 13 is a structural block diagram of a decoding apparatus 1300 according to another embodiment of the present invention.
- the decoding device 1300 may include: at least one processor 1301, a memory 1305, and at least one communication bus 1302.
- the video decoding device 1300 may further include: at least one network interface 1304 and/or a user interface 1303.
- the user interface 1303 includes, for example, a display (eg, a touch screen, an LCD, a Holographic, a CRT, or a Projector), a pointing device (such as a mouse or a trackball touch panel or a touch screen, etc.), a camera, and/or Or a pickup device, etc.
- the memory 1305 can include a read only memory and a random access memory and provides instructions and data to the processor 1001. A portion of the memory 1305 can also include a non-volatile random access memory.
- the memory 1305 stores elements, executable modules or data structures, or a subset thereof, or their extension set:
- the operating system 13051 includes various system programs for implementing various basic services and processing hardware-based tasks.
- the application module 13052 includes various applications for implementing various application services.
- the processor 1301 by calling a program or instruction stored in the memory 1305, the processor 1301 is configured to:
- the current motion vector field block is obtained by dividing the current motion vector field, where the current motion vector field is a motion vector corresponding to the video frame at time t field;
- the prediction information includes the information used to indicate a first reference motion vector field of the motion vector field block
- the first reference motion vector field Acquiring, according to the prediction information, the first reference motion vector field, where the first reference motion vector field is a motion vector field of a video frame at time t1;
- a motion vector field block of the second reference motion vector field Acquiring a motion vector field block of the second reference motion vector field, wherein a coordinate range of the motion vector field block of the second reference motion vector field in the second reference motion vector field and the current motion vector field
- the block has the same coordinate range in the current motion vector field
- the prediction signal includes a motion vector field block of the second reference motion vector field.
- the acquiring the second reference motion vector field according to the first reference motion vector field, the t time, the t1 time, and the t2 time includes:
- a motion vector of the second sampling point of the second reference motion vector field where a motion vector of the first sampling point of the first reference motion vector field; wherein, starting from a position of the first sampling point, a motion vector of the second sampling point is a position to which the displacement is moved The position of the second sampling point is the same position.
- the acquiring the second reference motion vector field according to the first reference motion vector field, the t time, the t1 time, and the t2 time includes:
- a position of the second sampling point starts from a position of each of the at least two first sampling points of the first reference motion vector field, respectively Positioning the respective movement vectors of the at least two first sampling points as displacements, the positions moved to the same position, and the respective motion vectors of the at least two first sampling points are the at least two first sampling points respectively The product of the motion vector and (t-t1)/(t1-t2);
- a product of a weighted average of the motion vectors of the at least two first sampling points and (t-t1)/(t1-t2) is used as a motion vector of the second sampling point.
- the acquiring the second reference motion vector field according to the first reference motion vector field, the t time, the t1 time, and the t2 time includes:
- the weighting value of the one second sampling point is used as a motion vector of the target second sampling point
- a weighted average of motion vectors of the at least two second sampling points is used as a motion vector of the target second sampling point.
- the prediction information includes direction coefficient information indicating a direction coefficient of the current motion vector field block, where the direction coefficient is used to indicate a motion component first component of a sampling point of the current motion vector field block The relationship between the value of the value and the value of the second component of the motion vector of the sample point;
- the direction coefficient information includes information for indicating a reconstructed motion vector field block in the current motion vector field, where the direction coefficient includes a direction coefficient of the reconstructed motion vector field block; or
- the direction coefficient information includes the value of the direction coefficient.
- the disclosed system, apparatus, and method may be implemented in other manners.
- the device embodiments described above are merely illustrative.
- the division of the unit is only a logical function division.
- there may be another division manner for example, multiple units or components may be combined or Can be integrated into another system, or some features can be ignored or not executed.
- the mutual coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection through some interface, device or unit, and may be in an electrical, mechanical or other form.
- the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, may be located in one place, or may be distributed to multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of the embodiment.
- each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.
- the above integrated unit can be implemented in the form of hardware or in the form of a software functional unit.
- the integrated unit if implemented in the form of a software functional unit and sold or used as a standalone product, may be stored in a computer readable storage medium.
- the technical solution of the present invention which is essential or contributes to the prior art, or all or part of the technical solution, may be embodied in the form of a software product stored in a storage medium.
- a number of instructions are included to cause a computer device (which may be a personal computer, server, or network device, etc.) to perform all or part of the steps of the methods described in various embodiments of the present invention.
- the foregoing storage medium includes: a U disk, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk, and the like. .
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Abstract
Description
Claims (34)
- 一种运动矢量场编码方法,其特征在于,包括:获取当前运动矢量场块的原始信号,所述当前运动矢量场块通过将当前运动矢量场分块后获取得到,所述当前运动矢量场为t时刻的视频帧对应的运动矢量场;获取所述当前运动矢量场块的预测信号和所述当前运动矢量场块的预测信息,所述预测信息用于指示获取所述预测信号所需的信息;根据所述预测信号和所述原始信号,计算所述当前运动矢量场块的预测残差信号,所述预测残差信号用于指示所述原始信号和所述预测信号之间的残差;将所述预测信息和所述预测残差信号写入码流。
- 根据权利要求1所述的运动矢量场编码方法,其特征在于,所述获取所述当前运动矢量场块的预测信号和所述当前运动矢量场块的预测信息,包括:获取所述当前运动矢量场块的第一参考运动矢量场,所述第一参考运动矢量场为已编码并重建的运动矢量场,其中,所述第一参考运动矢量场为t1时刻的视频帧对应的运动矢量场,所述t1时刻的视频帧为与所述t时刻的视频帧邻近的视频帧;根据所述第一参考运动矢量场、所述t时刻、所述t1时刻以及t2时刻,获取第二参考运动矢量场,其中,所述t2时刻为在对所述第一参考运动矢量场对应的视频帧进行帧间预测时所采用的参考视频帧对应的时刻;根据所述第二参考运动矢量场获取所述预测信号,所述预测信号包括所述第二参考运动矢量场的运动矢量场块,其中,所述第二参考运动矢量场的运动矢量场块在所述第二参考运动矢量场中的坐标范围与所述当前运动矢量场块在所述当前运动矢量场中的坐标范围相同;根据所述第一参考运动矢量场获取所述预测信息,所述预测信息包括所述用于指示所述第一参考运动矢量场的信息。
- 根据权利要求2所述的运动矢量场编码方法,其特征在于,所述根据所述第一参考运动矢量场、所述t时刻、所述t1时刻以及t2时刻,获取第二参考运动矢量场,包括:确定所述第二参考运动矢量场的第二采样点,其中,所述第二采样点的位置与分别以所述第一参考运动矢量场的至少两个第一采样点各自的位置为起点,以所述至少两个第一采样点各自的移动矢量为位移,所移动到的位置为同一位置,所述至少两个第一采样点各自的移动矢量为所述至少两个第一采样点各自的运动矢量与(t-t1)/(t1-t2)的乘积;将所述至少两个第一采样点的运动矢量的加权平均值与(t-t1)/(t1-t2)的乘积作为所述第二采样点的运动矢量。
- 根据权利要求2所述的运动矢量场编码方法,其特征在于,所述根据所述第一参考运动矢量场、所述t时刻、所述t1时刻以及t2时刻,获取第二参考运动矢量场,包括:获取与所述第二参考运动矢量场的目标第二采样点邻近的至少一个第二采样点,其中,以所述第一参考运动矢量场的任意一个第一采样点的位置为起点,以为位移,所移动到的位置与所述目标第二采样点的位置不同,为所述第一采样点的运动矢量;在所述至少一个第二采样点为一个第二采样点时,将所述一个第二采样点的加权值作为所述目标第二采样点的运动矢量;在所述至少一个第二采样点为至少两个第二采样点时,将所述至少两个第二采样点的运动矢量的加权平均值作为所述目标第二采样点的运动矢量。
- 根据权利要求1所述的运动矢量场编码方法,其特征在于,所述获取所述当前运动矢量场块的预测信号和所述当前运动矢量场块的预测信息,包括:获取所述当前运动矢量场块的方向系数,其中,所述方向系数用于指示所述当前运动矢量场块的采样点的运动矢量的第一分量的值与所述采样点的运动矢量的第二分量的值之间的关系;获取所述第一分量的重建值;根据所述第一分量的重建值和所述方向系数计算所述预测信号,所述预测信号包括所述第二分量的预测值;根据所述方向系数获取所述预测信息,所述预测信息包括用于指示所述方向系数的方向系数信息。
- 根据权利要求6所述的运动矢量场编码方法,其特征在于,所述获取所述当前运动矢量场块的方向系数,包括:获取所述原始信号的至少两个采样点的运动矢量;将所述至少两个采样点的运动矢量的第一分量作为预设函数的自变量,将所述至少两个采样点的运动矢量的第二分量作为所述自变量对应的函数值,将所述自变量和所述函数值进行拟合;将拟合得到的所述预设函数的系数作为所述方向系数。
- 根据权利要求6所述的运动矢量场编码方法,其特征在于,所述获取所述当前运动矢量场块的方向系数,包括:获取所述原始信号的至少两个采样点的运动矢量;将所述至少两个采样点的运动矢量的第一分量作为自变量,将所述至少两个采样点的运动矢量的第二分量作为所述自变量对应的函数值,将所述自变量和所述函数值进行拟合;获取所述当前运动矢量场中与所述当前运动矢量场块邻近的至少一个已编码的运动矢量场块的方向系数;将拟合出的函数的系数和所述至少一个已编码的运动矢量场块的方向系数作为所述当前运动矢量场块的候选方向系数集的候选方向系数;获取所述候选方向系数集的候选方向系数对应的所述当前运动矢量场块的候选预测残差信号,将信号能量最小或者率失真最小的候选预测残差信号所对应的候选方向系数作为所述当前运动矢量场块的方向系数。
- 根据权利要求6所述的运动矢量场编码方法,其特征在于,所述获取所述当前运动矢量场块的方向系数,包括:当所述当前运动矢量场中与所述当前运动矢量场块相邻的至少两个已编码运动矢量场块的方向系数相同时,将所述至少两个已编码运动矢量场块的方 向系数作为所述当前运动矢量场块的方向系数。
- 根据权利要求6所述的运动矢量场编码方法,其特征在于,所述获取所述当前运动矢量场块的方向系数,包括:当所述当前运动矢量场中与所述当前运动矢量场块相邻的至少两个已编码运动矢量场块的方向系数相同,并且所述至少两个已编码运动矢量场块的方向系数指示所述至少两个已编码运动矢量场块的采样点的运动矢量的第一分量与第二分量的比值时,执行以下步骤:将所述至少两个已编码运动矢量场块的方向系数作为候选方向系数集的候选方向系数;获取所述原始信号中至少一个采样点的运动矢量;在所述至少一个采样点为一个采样点时,将所述一个采样点的运动矢量的第一分量与所述一个采样点的运动矢量的第二分量的比值作为所述候选方向系数集的候选方向系数;或者,在所述至少一个采样点为至少两个采样点时,将所述至少两个采样点的运动矢量的第一分量与所述至少两个采样点的运动矢量的第二分量的比值的平均值作为所述候选方向系数集的候选方向系数;获取所述候选方向系数集的候选方向系数对应的所述当前运动矢量场块的候选预测残差信号,将信号能量最小或者率失真最小的候选预测残差信号所对应的候选方向系数作为所述当前运动矢量场块的方向系数。
- 一种运动运动矢量场解码方法,其特征在于,包括:获取当前运动矢量场块的预测信息和预测残差信号,所述当前运动矢量场块通过将当前运动矢量场分块后获取得到,所述当前运动矢量场为t时刻的视频帧对应的运动矢量场;根据所述预测信息获取所述当前运动矢量场块的预测信号;根据所述预测信号和所述预测残差信号,计算所述当前运动矢量场块的重建信号。
- 根据权利要求11所述的运动矢量场解码方法,其特征在于,所述预测信息包括所述用于指示所述运动矢量场块的第一参考运动矢量场的信息;所述根据所述预测信息获取所述当前运动矢量场块的预测信号,包括:根据所述预测信息获取所述第一参考运动矢量场,所述第一参考运动矢量场为t1时刻的视频帧的运动矢量场;根据所述第一参考运动矢量场、所述t时刻、所述t1时刻以及t2时刻,获取第二参考运动矢量场,其中,所述t2时刻为所述第一参考运动矢量场对应的视频帧所采用的参考视频帧对应的时刻;获取所述第二参考运动矢量场的运动矢量场块,其中,所述第二参考运动矢量场的运动矢量场块在所述第二参考运动矢量场中的坐标范围与所述当前运动矢量场块在所述当前运动矢量场中的坐标范围相同,所述预测信号包括所述第二参考运动矢量场的运动矢量场块。
- 根据权利要求12所述的运动矢量场编码方法,其特征在于,所述根据所述第一参考运动矢量场、所述t时刻、所述t1时刻以及t2时刻,获取第二参考运动矢量场,包括:确定所述第二参考运动矢量场的第二采样点,其中,所述第二采样点的位置与分别以所述第一参考运动矢量场的至少两个第一采样点各自的位置为起点,以所述至少两个第一采样点各自的移动矢量为位移,所移动到的位置为同一位置,所述至少两个第一采样点各自的移动矢量为所述至少两个第一采样点各自的运动矢量与(t-t1)/(t1-t2)的乘积;将所述至少两个第一采样点的运动矢量的加权平均值与(t-t1)/(t1-t2)的乘积作为所述第二采样点的运动矢量。
- 根据权利要求12所述的运动矢量场编码方法,其特征在于,所述根据所述第一参考运动矢量场、所述t时刻、所述t1时刻以及t2时刻,获取第二参考运动矢量场,包括:获取与所述第二参考运动矢量场的目标第二采样点邻近的至少一个第二采样点,其中,以所述第一参考运动矢量场的任意一个第一采样点的位置为起点,以为位移,所移动到的位置与所述目标第二采样点的位置不同,为所述第一采样点的运动矢量;在所述至少一个第二采样点为一个第二采样点时,将所述一个第二采样点的加权值作为所述目标第二采样点的运动矢量;在所述至少一个第二采样点为至少两个第二采样点时,将所述至少两个第二采样点的运动矢量的加权平均值作为所述目标第二采样点的运动矢量。
- 根据权利要求11所述的运动矢量场解码方法,其特征在于,所述预测信息包括用于指示所述当前运动矢量场块的方向系数的方向系数信息,所述方向系数用于指示所述当前运动矢量场块的采样点的运动矢量第一分量的值与所述采样点的运动矢量的第二分量的值之间的关系;所述根据所述预测信息获取所述当前运动矢量场块的预测信号,包括:获取所述第一分量的重建值,根据所述方向系数和所述第一分量的重建值计算所述第二分量的预测值,所述预测信号包括所述第二分量的预测值。
- 根据权利要求16所述的运动矢量场解码方法,其特征在于,所述方向系数信息包括用于指示所述当前运动矢量场中的已重建运动矢量场块的信息,所述方向系数包括所述已重建运动矢量场块的方向系数;或者,所述方向系数信息包括所述方向系数的值。
- 一种编码装置,其特征在于,包括:第一获取模块,用于获取当前运动矢量场块的原始信号,所述当前运动矢量场块通过将当前运动矢量场分块后获取得到,所述当前运动矢量场为t时刻的视频帧对应的运动矢量场;第二获取模块,用于获取所述当前运动矢量场块的预测信号和所述当前运动矢量场块的预测信息,所述预测信息用于指示获取所述预测信号所需的信息;计算模块,用于根据所述第二获取模块获取的所述预测信号和所述第一获取模块获取的所述原始信号,计算所述当前运动矢量场块的预测残差信号,所述预测残差信号用于指示所述原始信号和所述预测信号之间的残差;编码模块,用于将所述第二获取模块获取的所述预测信息和所述计算模块计算得到的所述预测残差信号写入码流。
- 根据权利要求18所述的编码装置,其特征在于,所述第二获取模块用于:获取所述当前运动矢量场块的第一参考运动矢量场,所述第一参考运动矢量场为已编码并重建的运动矢量场,其中,所述第一参考运动矢量场为t1时刻的视频帧对应的运动矢量场,所述t1时刻的视频帧为与所述t时刻的视频帧邻近的视频帧;根据所述第一参考运动矢量场、所述t时刻、所述t1时刻以及t2时刻,获取第二参考运动矢量场,其中,所述t2时刻为在对所述第一参考运动矢量场对应的视频帧进行帧间预测时所采用的参考视频帧对应的时刻;根据所述第二参考运动矢量场获取所述预测信号,所述预测信号包括所述第二参考运动矢量场的运动矢量场块,其中,所述第二参考运动矢量场的运动矢量场块在所述第二参考运动矢量场中的坐标范围与所述当前运动矢量场块在所述当前运动矢量场中的坐标范围相同;根据所述第一参考运动矢量场获取所述预测信息,所述预测信息包括所述用于指示所述第一参考运动矢量场的信息。
- 根据权利要求19所述的编码装置,其特征在于,所述第二获取模用于确定所述第二参考运动矢量场的第二采样点,其中,所述第二采样点的位置与分别以所述第一参考运动矢量场的至少两个第一采样点各自的位置为起点,以所述至少两个第一采样点各自的移动矢量为位移,所移动到的位置为同一位置,所述至少两个第一采样点各自的移动矢量为所述至少两个第一采样点各自的运动矢量与(t-t1)/(t1-t2)的乘积;将所述至少两个第一采样点的运动矢量的加权平均值与(t-t1)/(t1- t2)的乘积作为所述第二采样点的运动矢量。
- 根据权利要求18所述的编码装置,其特征在于,所述第二获取模块用于:获取所述当前运动矢量场块的方向系数,其中,所述方向系数用于指示所述当前运动矢量场块的采样点的运动矢量的第一分量的值与所述采样点的运动矢量的第二分量的值之间的关系;获取所述第一分量的重建值;根据所述第一分量的重建值和所述方向系数计算所述预测信号,所述预测信号包括所述第二分量的预测值;根据所述方向系数获取所述预测信息,所述预测信息包括用于指示所述方向系数的方向系数信息。
- 根据权利要求23所述的编码装置,其特征在于,所述第二获取模块用于:获取所述原始信号的至少两个采样点的运动矢量;将所述至少两个采样点的运动矢量的第一分量作为预设函数的自变量,将所述至少两个采样点的运动矢量的第二分量作为所述自变量对应的函数值,将所述自变量和所述函数值进行拟合;将拟合得到的所述预设函数的系数作为所述方向系数。
- 根据权利要求23所述的编码装置,其特征在于,所述第二获取模块用于:获取所述原始信号的至少两个采样点的运动矢量;将所述至少两个采样点的运动矢量的第一分量作为自变量,将所述至少两个采样点的运动矢量的第二分量作为所述自变量对应的函数值,将所述自变量和所述函数值进行拟合;获取所述当前运动矢量场中与所述当前运动矢量场块邻近的至少一个已编码的运动矢量场块的方向系数;将拟合出的函数的系数和所述至少一个已编码的运动矢量场块的方向系数作为所述当前运动矢量场块的候选方向系数集的候选方向系数;取所述候选方向系数集的候选方向系数对应的所述当前运动矢量场块的候选预测残差信号,将信号能量最小或者率失真最小的候选预测残差信号所对应的候选方向系数作为所述当前运动矢量场块的方向系数。
- 根据权利要求23所述的编码装置,其特征在于,所述第二获取模块用于:当所述当前运动矢量场中与所述当前运动矢量场块相邻的至少两个已编码运动矢量场块的方向系数相同时,将所述至少两个已编码运动矢量场块的方向系数作为所述当前运动矢量场块的方向系数。
- 根据权利要求23所述的编码装置,其特征在于,所述第二获取模块用于:当所述当前运动矢量场中与所述当前运动矢量场块相邻的至少两个已编码运动矢量场块的方向系数相同,并且所述至少两个已编码运动矢量场块的方向系数指示所述至少两个已编码运动矢量场块的采样点的运动矢量的第一分量与第二分量的比值时,执行以下步骤:将所述至少两个已编码运动矢量场块的方向系数作为候选方向系数集的候选方向系数;获取所述原始信号中至少一个采样点的运动矢量;在所述至少一个采样点为一个采样点时,将所述一个采样点的运动矢量的第一分量与所述一个采样点的运动矢量的第二分量的比值作为所述候选方向系数集的候选方向系数;或者,在所述至少一个采样点为至少两个采样点时,将所述至少两个采样点的运 动矢量的第一分量与所述至少两个采样点的运动矢量的第二分量的比值的平均值作为所述候选方向系数集的候选方向系数;获取所述候选方向系数集的候选方向系数对应的所述当前运动矢量场块的候选预测残差信号,将信号能量最小或者率失真最小的候选预测残差信号所对应的候选方向系数作为所述当前运动矢量场块的方向系数。
- 一种解码装置,其特征在于,包括:第一获取模块,用于获取当前运动矢量场块的预测信息和预测残差信号,所述当前运动矢量场块通过将当前运动矢量场分块后获取得到,所述当前运动矢量场为t时刻的视频帧对应的运动矢量场;第二获取模块,用于根据所述第一获取模块获取的所述预测信息获取所述当前运动矢量场块的预测信号;计算模块,根据所述第二获取模块获取的所述预测信号和所述第一获取模块获取的所述预测残差信号,计算所述当前运动矢量场块的重建信号。
- 根据权利要求28所述的解码装置,其特征在于,所述预测信息包括所述用于指示所述运动矢量场块的第一参考运动矢量场的信息;所述第二获取模块用于:根据所述预测信息获取所述第一参考运动矢量场,所述第一参考运动矢量场为t1时刻的视频帧的运动矢量场;根据所述第一参考运动矢量场、所述t时刻、所述t1时刻以及t2时刻,获取第二参考运动矢量场,其中,所述t2时刻为所述第一参考运动矢量场对应的视频帧所采用的参考视频帧对应的时刻;获取所述第二参考运动矢量场的运动矢量场块,其中,所述第二参考运动矢量场的运动矢量场块在所述第二参考运动矢量场中的坐标范围与所述当前运动矢量场块在所述当前运动矢量场中的坐标范围相同,所述预测信号包括所述第二参考运动矢量场的运动矢量场块。
- 根据权利要求29所述的解码装置,其特征在于,所述第二获取模块用于:确定所述第二参考运动矢量场的第二采样点,其中,所述第二采样点的位置与分别以所述第一参考运动矢量场的至少两个第一采样点各自的位置为起点,以所述至少两个第一采样点各自的移动矢量为位移,所移动到的位置为同一位置,所述至少两个第一采样点各自的移动矢量为所述至少两个第一采样点各自的运动矢量与(t-t1)/(t1-t2)的乘积;将所述至少两个第一采样点的运动矢量的加权平均值与(t-t1)/(t1-t2)的乘积作为所述第二采样点的运动矢量。
- 根据权利要求28所述的解码装置,其特征在于,所述预测信息包括用于指示所述当前运动矢量场块的方向系数的方向系数信息,所述方向系数用于指示所述当前运动矢量场块的采样点的运动矢量第一分量的值与所述采样点的运动矢量的第二分量的值之间的关系;所述第二获取模块,用于获取所述第一分量的重建值,根据所述方向系数和所述第一分量的重建值计算所述第二分量的预测值,所述预测信号包括所述第二分量的预测值。
- 根据权利要求33所述的解码装置,其特征在于,所述方向系数信息 包括用于指示所述当前运动矢量场中的已重建运动矢量场块的信息,所述方向系数包括所述已重建运动矢量场块的方向系数;或者,所述方向系数信息包括所述方向系数的值。
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US11343525B2 (en) * | 2019-03-19 | 2022-05-24 | Tencent America LLC | Method and apparatus for video coding by constraining sub-block motion vectors and determining adjustment values based on constrained sub-block motion vectors |
CN110136135B (zh) * | 2019-05-17 | 2021-07-06 | 深圳大学 | 分割方法、装置、设备以及存储介质 |
CN110636301B (zh) * | 2019-09-18 | 2021-08-03 | 浙江大华技术股份有限公司 | 仿射预测方法、计算机设备和计算机可读存储介质 |
CN113556567B (zh) * | 2020-04-24 | 2022-11-25 | 华为技术有限公司 | 帧间预测的方法和装置 |
CN115462080A (zh) * | 2020-05-29 | 2022-12-09 | 交互数字Vc控股法国有限公司 | 使用深度神经网络的运动修正 |
CN112804562B (zh) * | 2020-12-30 | 2022-01-07 | 北京大学 | 基于片重组的视频编码方法、装置、终端及介质 |
CN112788344B (zh) * | 2020-12-30 | 2023-03-21 | 北京大数据研究院 | 基于编码单元重组的视频解码方法、装置、系统、介质及终端 |
CN112788336B (zh) * | 2020-12-30 | 2023-04-14 | 北京大数据研究院 | 数据元素的排序还原方法、系统、终端及标记方法 |
CN112822488B (zh) * | 2020-12-30 | 2023-04-07 | 北京大学 | 基于块重组的视频编解码系统、方法、装置、终端及介质 |
WO2023219301A1 (ko) * | 2022-05-13 | 2023-11-16 | 현대자동차주식회사 | 인트라 예측 블록에 대한 움직임벡터 저장을 위한 방법 및 장치 |
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AU2019275631A1 (en) | 2020-01-02 |
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AU2019275631B2 (en) | 2021-09-23 |
JP6636615B2 (ja) | 2020-01-29 |
KR20180037042A (ko) | 2018-04-10 |
KR102059066B1 (ko) | 2019-12-24 |
EP3343923A4 (en) | 2019-03-13 |
CN107852500B (zh) | 2020-02-21 |
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