922results about How to "Improve decoding efficiency" patented technology

Provided are a color video scalability encoding and decoding method and a device thereof. The color video scalability encoding method includes encoding a chrominance image block of an enhancement layer by using lower layer information. In the encoding a chrominance image block, a color coded block pattern value is generated according to a pattern of quantization coefficients of a residual chrominance Image block chrominance image block generated using the lower layer information.

An apparatus for receiving and decoding a double-coded symbol in a communication system using a double coding scheme for encoding a Reed-Solomon (RS)-coded symbol with a predetermined scheme for communication. In the apparatus, an inner decoder receives a frame formed with the double-coded symbols, and primary-decodes the received frame. An RS decoding buffer stores an output of the inner decoder frame by frame, and an RS decoder reads symbols in the same column from symbols of a frame stored in the RS decoding buffer, performs RS decoding on the read symbols, and generates an RS decodable indicator value for each symbol. A log likelihood ratio (LLR) update unit updates an LLR value using the RS decodable indicator value, and outputs the updated LLR value to the inner decoder.

The invention relates to a system and a method for positioning a mobile robot based on regular graphic code composite tags. The system comprises a regular graphic code positioning controller, a regular graphic code reader, a radio frequency identification (RFID) tag code reader, and the regular graphic code composite tags which are distributed on the ground, wherein each regular graphic code composite tag is formed by compositing a regular graphic code tag and an RFID tag. The method comprises the following steps of: (1) establishing an image coordinate system, a trolley coordinate system and a world coordinate system; (2) calculating the deviation position and position angle of a mobile robot trolley relative to each composite tag in the trolley coordinate system; (3) calculating the deviation position and angle of each composite tag relative to the world coordinate system; and (4) calculating the deviation position and angle of the mobile robot trolley relative to the world coordinate system. The invention is reasonable in design, the characteristics of the regular graphic code tag and the RFID tag are effectively combined, a function of accurately positioning the mobile robot trolley is realized, and positioning efficiency is improved.

A decoding method for block-based digital encoded picture is disclosed. The method including the steps of reconstructing a zeroth reference picture list and a first reference picture list for a current picture based on a predetermined digital picture coding protocol; establishing a lookup table which includes a parameter field for storing a distance scalar, the distance scalar being derived from the time sequence characteristic values of the current picture, the co-located picture and a predetermined reference picture; determining a derived motion vector of a direct mode bi-predictive block according to the distance scalar and a predetermined motion vector of a co-located block with respect to the predetermined reference picture. An apparatus for implementing the method is also disclosed.

The present invention relates to an arithmetic decoding system and apparatus based on the adaptive content. The system includes a control unit, a decoding unit and an interface unit. The control unit fills the code stream data into the decoding unit and configures and controls the decoding unit through the interface unit. The decoding unit performs a decoding for all the syntax elements from the code stream data in the macro block, assembles the syntax elements and transmits them to the control unit. The interface unit transfers the interaction information between the decoding unit and the control unit. The present invention obtains syntax elements by the CABAC decoding through hardware so that the decoding efficiency is highly improved and the requirements for the video processing speed and the data processing capacity of the real-time and high definition applications are satisfied.

A method and an apparatus for performing multi-threaded video decoding are disclosed. The method takes use of a multi-threaded scheme to process an encoded picture stream on a picture by picture basis. In the method, multiple threads are used for performing video decoding at the same time, such as one thread for the operation of parsing input bits into syntax elements of one picture implemented by the first thread, another thread for the operation of decoding the parsed syntax elements of another picture into pixel values implemented by the second thread, and the other threads for the operations of the non-reference picture, such as bidirectional predictive picture, including parsing input bits into syntax elements and the subsequent operation of decoding the parsed syntax elements into pixel values. Therefore, the decoding speed is substantially increased, and the decoding efficiency is enhanced.

According to a picture coding method of the present invention, a coded picture identified by a picture number is stored, as a reference picture, into a storage unit; commands indicating correspondence between picture numbers and reference indices for designating reference pictures and coefficients used for generation of predictive images are generated; a reference picture being used when motion compensation is performed on a current block in a current picture to be coded is designated by a reference index; a predictive image is generated by performing linear prediction on a block being obtained by motion estimation within the designated reference picture, by use of a coefficient corresponding to the reference index; a coded image signal including a coded signal obtained by coding a prediction error being a difference between the current block in the current picture to be coded and the predictive image, the commands, the reference index and the coefficient is outputted. At that time, information indicating the maximum reference index value is coded and included into the coded image signal, and the commands indicating correspondence between at least one picture number and a plurality of reference indices are generated.

Provided is a method and apparatus for encoding and decoding multi-view video data. The encoding method includes: decomposing each view image of the multi-view video into an overlapped region and a non-overlapped region, the overlapped region being overlapped with other view image and the non-overlapped region not being overlapped with other view image; generating a stitched image by combining the non-overlapped region of each view image and a middle view image; encoding the stitched image using a first encoding algorithm; and encoding the overlapped region of each view image, using a second encoding algorithm. Further, the decomposing step includes the steps of estimating disparity information for each view image, based on a predetermined view image; and decomposing each view image into said overlapped region and said non-overlapped region using the estimated disparity information.

The invention discloses a wireless video monitoring system and a method for dynamically regulating a code stream according to network state. The method comprises that: when the wireless video monitoring system performs real-time video data transmission, a mobile video access unit regulates the key frame interval and code rate of the video data adaptively according to the packet loss rate of the video data reported by a mobile terminal before the video data transmitted by the fixed network video monitoring system is forwarded to the mobile terminal. When the system and the method are adopted, a mobile terminal can play real-time video data smoothly in network environments in all states.

The invention provides a polarized code simplifying and decoding method.The polarized code simplifying and decoding method includes the following steps that step S1, a tree graph model is established for received polarized codes; step S2, nodes in a tree graph are divided into information nodes, fixed value nodes and mixed nodes; step S3, the tree graph is pruned, sub-trees between the fixed value nodes and the information nodes are cut off, and the fixed value nodes and the information nodes connected with the mixed nodes are left; step S4, a decoding tree graph after pruning is subjected to decoding operation.The polarized code simplifying and decoding method can achieve the purposes of reducing decoding complex and improving the decoding efficiency on the premise that the decoding performance is not affected and finally performs simulation verification, and the decoding complexity of SC decoding and BP decoding after simplification are reduced by 36%-65% and 41%-67% respectively compared with an original algorithm.

Methods and apparatus for decoding codewords using message passing decoding techniques which are particularly well suited for use with low density parity check (LDPC) codes and long codewords are described. The described methods allow decoding graph structures which are largely comprised of multiple identical copies of a much smaller graph. Copies of the smaller graph are subject to a controlled permutation operation to create the larger graph structure. The same controlled permutations are directly implemented to support message passing between the replicated copies of the small graph. Messages corresponding to individual copies of the graph are stored in a memory and accessed in sets, one from each copy of the graph, using a SIMD read or write instruction. The graph permutation operation may be implemented by simply reordering messages, e.g., using a cyclic permutation operation, in each set of messages read out of a message memory so that the messages are passed to processing circuits corresponding to different copies of the small graph.

The present invention relates to an arithmetic decoding system and apparatus based on the adaptive content. The system includes a control unit, a decoding unit and an interface unit. The control unit fills the code stream data into the decoding unit and configures and controls the decoding unit through the interface unit. The decoding unit performs a decoding for all the syntax elements from the code stream data in the macro block, assembles the syntax elements and transmits them to the control unit. The interface unit transfers the interaction information between the decoding unit and the control unit. The present invention obtains syntax elements by the CABAC decoding through hardware so that the decoding efficiency is highly improved and the requirements for the video processing speed and the data processing capacity of the real-time and high definition applications are satisfied.

A method of encoding data using a parity check matrix, a method of decoding encoded data, and a data retransmission method using the same are disclosed. A data retransmission method in a communication system includes transmitting a codeword encoded by a first parity check matrix corresponding to a first coding rate, among at least two parity check matrixes corresponding to different coding rates, receiving NACK from the receiver in response to the codeword, and transmitting parity bits encoded by some of the second parity check matrix corresponding to a second coding rate, among the at least two parity check matrixes, to the receiver.

The embodiment of the invention provides a streaming media processing method and device. The method comprises: in the process of playing a streaming media file, receiving a time shifting instruction from a user, wherein the time shifting instruction includes a target time point; determining the transmission stream (TS) slice corresponding to the target time point according to the slice index file corresponding to the streaming media file; determining the position information of a key frame which is located at the nearest position to the target time point in the TS slice; and playing the TS slice from the position information of the key frame. According to the embodiment of the invention, the streaming media processing method and device are able to directly start to play the TS slice from the key frame located at the nearest position to the time shifting target time point, and therefore, the time shifting accuracy in the process of playing the streaming media file may be improved.

The invention discloses a multilevel multitask parallel decoding algorithm on a multicore processor platform, and provides the multilevel multitask parallel decoding algorithm for effective combination of tasks and data on the multicore processor platform by utilizing the dependency of HEVC data by aiming at the problems of mass data volume of high-definition videos and ultrahigh processing complexity of HEVC decoding. HEVC decoding is divided into two tasks of frame layer entropy decoding and CTU layer data decoding which are processed in parallel by using different granularity; the entropy decoding task is processed in parallel in a frame level mode; the CTU data decoding task is processed in parallel in a CTU data line mode; and each task is performed by an independent thread and bound to an independent core to operate so that the parallel computing performance of a multicore processor can be fully utilized, and real-time parallel decoding of HEVC full high-definition single code stream using no parallel coding technology can be realized. Compared with serial decoding, the decoding parallel acceleration rate can be greatly enhanced and the decoding image quality can be guaranteed by using the multicore parallel algorithm.

The invention discloses a method for predicting a vector in the multi-view point view coding, comprising the following steps that: the coding way adopted in a current image block is determined; if the current image block adopts the inter-view interframe prediction coding way, the vector of the difference of the view points of the current image block is predicted; if the current image block adopts the intra-view interframe prediction coding way, the motion vector of the current image block is predicted. The invention also discloses a vector predicting device in the multi-view point view coding, which is characterized in that the device comprises a current image block determining unit, a coding way determining unit, a vector of the difference of the view points predicting unit and a motion vector predicting unit. The invention also discloses a method for predicting the vector in the multi-view point view coding and a multi-view point view coding system. The method, the device and the system disclosed by the invention can improve the prediction accuracy of the vector of the difference of the view points and the motion vector and raise the coding efficiency of the multi-view point video.

Provided is an audio signal encoding method including transforming an input signal from a time domain to a time / frequency domain using a first transformation method, extracting a stereo parameter from a signal of the time / frequency domain, encoding the stereo parameter, and down-mixing the signal of the time / frequency domain, transforming each of sub-bands of the down-mixed signal to a frequency domain by using a second transformation method, and encoding the signal of the frequency domain in the frequency domain.

The invention discloses a LDPC hard decision decoding method based on depth learning; the method comprises the following steps: 1, using a group (X, Y) as a group of labeled data; 2, building a LDPC decoding sample set; 3, building a depth learning decoding model; 4, pre-training the depth learning decoding model; 5, allowing the depth learning decoding model to decode and output data. The invention also discloses a decoder using the LDPC hard decision decoding method based on depth learning; the decoder comprises an input unit, the depth learning decoding model, an output unit, and a controller. The invention imports the LDPC hard decision decoding method based on depth learning on the basis of a conventional maximum likelihood decoding algorithm, thus reducing decoding computational quantity and complexity, and improving decoding efficiency.

The invention particularly relates to a browser audio and video decoding and playing method based on webassembly. The browser audio and video decoding and playing method based on webassembly comprisesthe following steps that a user customizes a c-version decoding library according to the coding type of the audio and video, compiles the customized c-version decoding library into webcast codes forthe browser to call through the Emscripten, decodes the webassembly codes at the browser end through webassembly in a multi-thread mode, and audio and video are played in a delay-free mode. Accordingto the browser audio and video decoding and playing method based on webassembly, multi-thread decoding is adopted, the decoding efficiency is high, delay-free and plug-in-free playing can be achieved,and playing of audio and video streams of various coding formats is supported.

The invention provides a check matrix based erasure code decoding method which is applicable to optional erasure codes on the basis of exclusive or operation. Decoding efficiency is greatly improved by decoding the check matrix. In addition, through an iterative algorithm for structuring a sparse check matrix, decoding efficiency can be further improved. Compared with two conventional implementation methods, the check matrix based erasure code decoding method has the advantages of universality and high efficiency.

A method, an apparatus and a system for a rapid motion search applied in template matching are disclosed. The method includes: selecting motion vectors of blocks related to a current block as candidate motion vectors of the current block; after the uniqueness of a series of the candidate motion vectors of the current block is maintained, calculating the cost function of the candidate motion vectors in a corresponding template area of a reference frame, and obtaining the motion vector of the best matching template from the candidate motion vectors of the current block. In the embodiments of the present invention, there is no need to determine a large search range and no need to determine the corresponding search path template, and it is only necessary to perform a search in a smaller range.

The invention discloses an image decoding method and device, wherein the method comprises the following steps: receiving a request for decoding an appointed image; decomposing the appointed image into multiple decoding tasks; determining the decoding capability information of a central processing unit CPU and the decoding capability information of a graphic processing unit GPU of current terminal equipment respectively during image decoding; and distributing the multiple decoding tasks to the CPU and the GPU to perform parallel processing according to the decoding capability ratio of the CPU to the GPU. By means of the invention, the image decoding efficiency can be increased.

A method of an efficient adaptive mode selection for H.264 / AVC-coded video delivery in burst-packet-loss networks to generate the image data of the missing macroblocks in the decoded current frame by using the information related to the spatial redundancy in the same frame and the temporal redundancy in the inter frames is disclosed. The method first employs the Intra High-Speed Spatial Error Concealment (SEC) method for the initial frame. For the succeeding inter frames, the Temporal Error Concealment (TEC) method is used when the Adjacent External Boundary Matching Error (AEBME) of the surrounding macroblocks is not more than the dynamic threshold (DTα). The Intra High-Speed SEC is used when AEBME is more than (DTα) and the surrounding macroblocks are all coded intra-method, otherwise the task proceeds by employing Normal SEC.