39results about How to "Reduce encoding overhead" patented technology

For interlaced B-fields or interlaced B-frames, forward motion vectors are predicted by an encoder/decoder using forward motion vectors from a forward motion vector buffer, and backward motion vectors are predicted using backward motion vectors from a backward motion vector buffer. The resulting motion vectors are added to the corresponding buffer. Holes in motion vector buffers can be filled in with estimated motion vector values. An encoder/decoder switches prediction modes between fields in a field-coded macroblock of an interlaced B-frame. For interlaced B-frames and interlaced B-fields, an encoder/decoder computes direct mode motion vectors. For interlaced B-fields or interlaced B-frames, an encoder/decoder uses 4 MV coding. An encoder/decoder uses “self-referencing” B-frames. An encoder sends binary information indicating whether a prediction mode is forward or not-forward for one or more macroblocks in an interlaced B-field. An encoder/decoder uses intra-coded B-fields [“BI-fields”].

For interlaced B-fields or interlaced B-frames, an encoder/decoder uses 4MV coding. For example, 4MV is used in one-direction prediction modes (forward or backward modes), but not in other available prediction modes (e.g., direct, interpolated). Using 4MV allows more accurate motion compensation for interlaced B-fields and interlaced B-frames; limiting 4MV to forward and backward modes reduces coding overhead and avoids decoding complexity associated with combining 4MV with modes such as direct and interpolated.

An encoder/decoder uses intra-coded B-fields [“BI-fields”]. For example, rather than encoding many of the macroblocks in a field as intra macroblocks at a scene change, an encoder can choose to encode the entire field as intra. Encoding an entire field as a BI-field allows increased coding efficiency through reduced coding overhead at macroblock level, and without intra-frame dependency, the BI-field can still be dropped if appropriate in low-bitrate applications.

An embodiment of the invention discloses an encoding method and a device, a decoding method and a device and an encoding and decoding system. The encoding method includes that an encoding terminal obtains data to be encoded, and the data to be encoded are at least one largest coding unit (LCU); the encoding terminal determines a quantization depth parameter of the LCU according to a code rate control algorithm and writes the quantization depth parameter into the data to be encoded; the encoding terminal determines quantization parameters (QPs) of coding units (CUs) according to the size of a minimum image block and the size of CUs contained in the LCU; the encoding terminal calculates QP differences of CUs according to the QPs of the CUs and QP predicated values of the CUs; the encoding terminal carries the QP difference of the CU in the CU for each CU which meets preset conditions; and the encoding terminal encodes the quantization depth parameter, the QP differences of the CUs which meet the preset conditions and the CUs to obtain code streams. The embodiment of the invention further provides a decoding method and an encoding and decoding device. According to the embodiment of the encoding method and the device, and the decoding method and the device, the code rate control accuracy and the compression efficiency can be effectively improved.

The embodiment of the invention discloses a coding method, a coding device, a decoding method, a decoding device, a coding system and a decoding system. The coding method comprises the following steps that: a coder acquires data to be coded, wherein the data to be coded is at least one largest coding unit (LCU); the coder determines a quantization depth parameter of the LCU according to a code rate control algorithm, and writes the quantization depth parameter into the data to be coded; the coder determines a quantization parameter (QP) of each CU according to a minimum image block dimension and the dimension of each CU in the LCU; the coder calculates a QP difference of each CU according to the QP and a QP predicted value of the CU; for each CU consistent with a preset condition, the coder carries the QP difference of the CU into the CU; and the coder codes the quantization depth parameter, the QP difference of the CU consistent with the preset condition and each CU to obtain a code stream. The embodiment of the invention also provides the decoding method, the coding device and the decoding device. By the embodiment of the invention, code rate control accuracy and compression efficiency can be effectively improved.

The embodiment of the present invention provides the method and device for sending and receiving feedback information, and relates to the communication field. The method for sending the feedback information comprises the steps of receiving the uplink data sent by a user equipment (UE); determining a first load length, wherein the first load length is one of at least two load lengths in a load length set; determining the position index of the feedback information corresponding to the uplink data in a feedback information set, wherein the length of the feedback information set is the first load length; according to the position index, mapping the feedback information corresponding to the uplink data to the feedback information set; according to the first load length, carrying out the jointed coding on the feedback information set; and sending the coded feedback information set. According to the present invention, the coding cost can be reduced, and the coding gain can be improved.

The invention provides an image encoding method and device, an image decoding method and device, electronic equipment and a system. The image encoding method comprises the following steps: determininga prediction value of a coding block, and calculating a prediction difference value between the coding block and the prediction value; carrying out one or more times of transformation on the prediction difference value to obtain transformation data, and determining a transformation coefficient by using the transformation data; determining a scanning mode of the transformation coefficients and thesizes of coefficient groups, dividing the transformation coefficients into one or more coefficient groups, scanning the transformation coefficients contained in each coefficient group according to the scanning mode, and converting the transformation coefficients into one or more syntax elements; and encoding the size of the coefficient group and the value of the syntax element, and writing encoded bits into a code stream. According to the image encoding method, the coding overhead of the coefficient group flag bit is effectively reduced, and the coding efficiency of the transformation coefficient is improved.

The invention provides an encoding method and device of a polar code. The method comprises the following steps: determining the first master code length corresponding to an information bit sequence according to the target code length corresponding to the information bit sequence; performing Polar code encoding on the information bit sequence according to the first master code length and the mapping relation information, wherein the mapping relation information comprises the corresponding relation of the master code length and at least one of the following: transmission block size, constructionwork point and a construction sequence. By using the method provided by the invention, the Polar code encoding can be directly performed on the information bit sequence according to at least one of the first transmission block size, the first construction work point and the first construction sequence which is determined based on the master code length of the Polar code and corresponds to the information bit sequence, and the encoding overhead in the Polar code encoding process can be reduced.

The invention discloses a geometric division mode prediction method and device based on coding and decoding terminals, a storage medium and a terminal. The method comprises the steps: carrying out theoptimal mode prediction of a current coding block, and selecting a most possible mode set from a total mode set; performing mode decision in the most possible mode set; and writing the index of the optimal mode obtained by final decision in the most possible mode set into a code stream; performing mode decision from the total mode set, identifying whether the optimal mode obtained by final decision is in the most possible mode set or not by using an identification bit, if so, writing the index of the optimal mode in the most possible mode set into the code stream, and otherwise, writing the index of the optimal mode in the total mode set into the code stream. Therefore, according to the embodiment of the invention, the division mode coding cost can be reduced, the compression performanceis improved, and the coding end complexity is reduced.

The invention provides a rate splitting based method for allocating user rates in wireless multiple access channels, which is characterized by firstly computing the parameters of a rate splitting based multiple access communication system, including computing the splitting sequences and the splitting parameters; obtaining the splitting sequences of the user by merging binary trees; splitting the rates of a plurality of users into a series of two-user rate splitting based on the splitting sequences; alternately using the splitting formulas of two kinds of father nodes according to the splitting sequences to compute the splitting coefficients of all the users and the interference noise sum corresponding to the virtual users; and adjusting the code rate at the transmitting end of the user and controlling the successive decoding sequences of the virtual users at the receiving end according to the obtained splitting parameters so as to further realize the preset rate allocation strategy. The method can realize any rate allocation on the boundary of the multiple access channel capacity region, farthest utilize the wireless communication resources, not only reduce coding complexity but also dispense with strict synchronization among the users. In addition, the method is simple and effective and is used for allocating the wireless communication resources.

The invention provides a variable code rate video compression method, system and device and a storage medium, and the method comprises the steps: enabling a reference frame image to pass through a convolutional neural network to obtain a first feature map of a reference frame, obtaining a second feature map of the reference frame through scale zooming and derivable quantization, and carrying out the inverse zooming to obtain a reconstructed reference frame. Processing the prediction frame image through a convolutional neural network to obtain a first feature map of the prediction frame, and performing scale scaling and quantization to obtain a second feature map of the prediction frame; subtracting the second feature map of the prediction frame from the second feature map of the reference frame to obtain a feature map residual error; using a second feature map of the reference frame as prior information, performing lossless entropy coding on a feature map residual error, and transmitting the feature map residual error to a decoding end; and after the feature map residual error and the second feature map of the reference frame are added and inversely scaled, a reconstructed prediction frame is obtained through a convolutional neural network. According to the method, the scale factors are used for scaling the feature maps, so that the feature maps corresponding to different code rate qualities are obtained.

The embodiment of the invention discloses a video coding method and device, equipment and a storage medium. The method comprises the following steps: based on the proportion of a target macro block in a current video frame, calculating a target coding offset when the target macro block reaches adaptive coding quality; calculating a non-target coding offset of a non-target macro block in the current video frame based on a frame-level coding stability principle and the target coding offset; and correspondingly adjusting macro block coding parameters of the target macro block and the non-target macro block by adopting the target coding offset and the non-target coding offset. According to the technical scheme provided by the embodiment of the invention, the coding optimization of the target macro block and the non-target macro block of the current video frame is realized, the complexity and the coding overhead of video coding are greatly reduced, and the high efficiency of video coding is ensured; and meanwhile, on the basis of ensuring the high efficiency of video coding, the coding quality of the video is further improved.

The embodiment of the invention discloses a coding mode determination method and device, a server and a storage medium. The method comprises the following steps of: determining an adaptive predictionmode and a depth division indication of a target coding unit under each coding depth based on a reference coding parameter of each mapping coding unit of the target coding unit under each coding depthin a corresponding reference video frame; and determining a target coding mode enabling the coding cost of the target coding unit to be optimal from coding division modes oriented to the adaptive prediction modes and the depth division indications under the coding depths. According to the technical scheme provided by the embodiment of the invention, the coding overhead in the video coding processis greatly reduced, the reference coding parameters of the reference video frame are fully utilized to guide the coding of the target coding unit under other code rates, the coding complexity of thetarget coding unit is reduced on the basis of ensuring the coding quality of the target coding unit, and the coding efficiency of the target coding unit is improved.