40results about How to "Reduce codec complexity" patented technology

An apparatus and method for SFBC coding and decoding in a communication system using a plurality of (N₁) Tx antennas are provided. In a transmitter using N_t transmit antennas, a pre-coder pre-codes an input symbol sequence using a pre-coding matrix. The pre-coding matrix is produced by puncturing a unitary matrix in a predetermined method. An encoder generates a plurality of vectors by grouping the symbols of the pre-coded symbol sequence by twos, space-frequency maps each of the vectors by encoding each of the vectors in an Alamouti coding scheme, and provides each of the space-frequency mapped symbols to a predetermined OFDM modulator.

The invention relates to the information technology field of radio electronics and telecommunication technology, and relates to an aggregate of wireless enhancement technology of high-speed data transmission in the wireless communication field, in particular to an all-in-one feedback retransmission method based on fountain code mainly applied to wireless channel data transmission high-speed data service in a general mobile communication system. The method utilizes the ratioless channel coding principle of the fountain code, improves the existing mixed bit error feedback retransmission HARQ method and data coding mode in a wireless link, and mainly solves the relevant technical problems of how to utilize unique fountain code series to carry out the algorithm flow of coding and decoding foreach data block. The method has the beneficial effects that the feedback retransmission method and relevant fountain code design scheme can lead the data throughput of the wireless link to be improvedby 110% compared with the prior art, and the method has higher efficiency when the data blocks segmented in each group is more or the initial transmission groups sharing the same retransmission groupare more.

The embodiment of the invention discloses a method, a device and a system for processing an image residual block, relating to the technical field of video coding and decoding and capable of increasing the video compression coding performance and reducing the complexity in coding and decoding calculation. The method for processing the image residual block, provided by the embodiment of the invention, comprises the steps of: performing transformation coding on residual blocks of blocks to be coded by adopting a transformation base to obtain transformation coefficients of the residual blocks; determining a scanning sequence of the transformation coefficients of the residual blocks according to the transformation base and the grain direction information of the blocks to be coded; and scanningthe transformation coefficients of the residual blocks according to the scanning sequence to obtain the scanned transformation coefficients.

The embodiment of the invention provides a point cloud geometrical information inter-frame encoding and decoding method. The method comprises the following steps: acquiring a frame point cloud in front of a current frame point cloud as a reference frame point cloud; making octree division on the current frame point cloud and the reference frame point cloud respectively, then dividing divided nodes, making iterative division until leaf nodes are ended to acquire a first octree structure of the current frame point cloud and a second octree structure of the reference frame point cloud; obtainingthe occupation condition of each reference node, and when the occupation condition of the reference node corresponding to the coding node is occupied, obtaining the occupation condition of a first neighbor node of the reference node; and determining a context model of a to-be-coded node placeholder code based on the placeholder condition, and performing entropy coding according to the context model to obtain a binary code stream. When the inter-frame prediction is occupied, the inter-frame context model is used for entropy coding, otherwise, the intra-frame context model is used for entropy coding, and motion compensation is not needed, so that the inter-frame coding and decoding complexity can be reduced, and the geometric entropy coding performance can be improved.

The invention discloses a joint channel security coding method based on a balance index and a polarization code. The method comprises the steps that after polarization code coding is carried out on all message sequences, the sequences are encoded into balance code words with the same number of 0 and 1; the balance index is used to carry out one-time pad sequence password encryption with small complexity on the balance code words; and private key encryption system encryption is carried out on the balance index based on the polarization code. The code words have dual functions of error correction and encryption, which can reduce the overhead of a system. In the design of the private key encryption system, the redundant information freeze bit of the polarized code is used as one private key which has the tasks of error correction and encryption; a randomly generated error vector ensures that the system is resistant to the existing exhaustive attack and selection plaintext attack; and the decoding complexity is reduced.

The invention discloses a hop-by-hop reliable transmission control method for an underwater wireless sensor network. Based on a digital fountain code technology irrelevant to a code rate, optimized degree distribution and recursive coding ideas are adopted, and an RLT (recursive LT) coding scheme is designed, so that rapid and efficient coding and decoding are realized; packet collision and end-to-end delay are reduced; and the network throughput is increased. Through collection of feedback information of a receiving node, the packet corruption probability of an underwater acoustic channel is accurately estimated, and the coding packet quantity of next transmission is further computed, so that the transmission overhead of extra packets is reduced. The fourth-layer reliable transmission mechanism and the second-layer medium access control mechanism of a conventional TCP/IP (Transmission Control Protocol/Internet Protocol) protocol stack are organically fused, so that block-by-block and hop-by-hop reliable transmission of the underwater wireless sensor network is realized on the basis of RLT coding, and transmission-reception conflicts, multi-transmission-single-reception conflicts and data-ACK conflicts caused by simplex communication of an underwater Modem are reduced. As an effective and practicable technical scheme, the method has a good application prospect.

The invention relates to a method and system for encoding a region of interest by limited variable bit rate control, which improves the picture quality of images of a motion region and a region of interest of human eyes at a limited bit rate, and achieves the purpose of saving the encoding bit rate by rejecting high-frequency coefficient information of much background images. Compared with ROI encoding by constant bit rate control (CBR) taking a traditional rate-distortion model as the basis, the limited variable bit rate control algorithm of the invention is matched with a quick block decision mechanism, has lower encoding and decoding complexity, and is more suitable for an instant monitoring coding system.

The invention discloses a coding method of an intra-frame division mark. The coding method is used for solving the technical problem that an existing coding method is low in compressed coding efficiency. The coding method conducts a line controller unit (LCU) address with 0 depth and 0 coding division mark or address difference, and difference in coding adjacent image division manner with 1 depth, effectively reduces the number of depth 0 and 1 division mark coding bits, and improves compressed coding efficiency.

The invention discloses a method for coding a syntactic element. The method can improve the compression coding efficiency of the syntactic element. The coding method comprises the following steps: inquiring a pre-configured coding data structure according to the code attribute value of current frame or fragmentation, and determining a method for representing the syntactic element for the current frame or fragmentation, wherein the coding data structure includes more than two coding attribute values, and identification information of the representation method related to each code attribute value; and coding the current frame or the fragmentation according to the determined representation method of the syntactic element. The coding device comprises a representation method determining unit of the syntactic element, and a coding unit of the syntactic element. According to the self-adaption coding method disclosed by the invention, the frame or the fragment is used as a basic unit, which means that the distribution of code words or the sequence of identifications in a predication mode can be dynamically adjusted according to each frame or each fragment in turn, therefore, the compression coding efficiency can be obviously improved, and the information redundancy can be reduced as well.

The embodiment of the invention discloses a coding method, which comprises: scaling a data frame according to the energy and coding bit number of the data frame; quantizing coded vectors in the scaleddata frame into closest RE8 grid points to acquire vectors to be coded; and coding the vectors to be coded by layer to acquire a coded code stream. The embodiment of the invention also discloses a decoding method, a coding device and a decoding device. The methods and the devices of the invention effectively reduce operation complexity and save storage space on the premise of ensuring coding anddecoding quality.

The embodiment of the invention provides a layered video encoding and decoding method, an encoding device and a decoding device. The method comprises steps: a relative image block of an enhancement layer image block is determined, wherein the relative image block comprises a base layer image block corresponding to the enhancement layer image block and an encoded image block near the enhancement layer image block; residual information corresponding to the relative image block is acquired; according to the residual information corresponding to the relative image block, whether generalized residual prediction algorithm is adopted when interframe prediction is carried out on the enhancement layer image block is determined, wherein the residual information corresponding to the relative image block is used for indicating whether the relative image block has residual or indicating the residual degree of the relative image block. According to the layered video encoding and decoding method, the encoding device and the decoding device, complexity of video encoding and decoding and the time of encoding and decoding can be reduced.

The invention discloses an image decoding method and device, and electronic equipment. The method comprises the steps of obtaining a to-be-coded original image; encoding the original image by using a preset encoding standard to obtain target encoding data, the preset encoding standard being based on intra-frame prediction encoding and including target block division processing and target quantization processing, the target block division processing being image block division processing based on a preset rule, the target quantization processing comprising data quantization processing based on grid coding quantization. According to the method, the complexity of image coding processing can be reduced on the premise of considering the image compression performance.

The invention discloses a view map array division method which comprises the following steps: decomposing a light field image to acquire a view map array; and performing reference view map and rebuiltview map division on the view map array by using an ADP (Automatic Data Processing) or SMP (Symmetric Multi-Processing) algorithm to enable a proportion and a sparse degree of reference view maps inthe divided view map array to be both less than preset targets. The method can enable the proportion of the reference view maps to be lower and enable sampling to be sparser, thereby reducing the overall encoding and decoding complexity.

The invention provides a video decoding method and device, a video coding method and device, equipment and a storage medium, which relate to the technical field of video coding and decoding. The method comprises the following steps of decoding a code stream to obtain a binary symbol string of string length information of a current string, performing reverse binarization processing on the binary symbol string according to the string length resolution of the current string to obtain string length information, and determining the string length of the current string according to the string length information. The length of the pixel string in the coding and decoding block can be limited to be the multiple of the string length resolution, the uniformity of the pixel string is improved, a coding and decoding end can carry out coding and decoding under the condition of memory alignment, and the coding and decoding efficiency of the pixel string is improved. Besides, in consideration of the influence of the string length resolution on string length information coding and decoding, a binarization and anti-binarization processing method for string length information is provided, the coding and decoding mode of the string length information under different string length resolutions is improved, and the coding and decoding performance can be improved.

The invention provides a video processing method and device. The method comprises the following steps: determining a chrominance block to be coded or decoded; and taking the motion vector of one luminance block in the luminance blocks corresponding to the chrominance block as the motion vector of the chrominance block. By directly using the motion vector of one of the brightness blocks corresponding to the chrominance block as the motion vector of the chrominance block, the process of obtaining the motion vector of the chrominance block can be effectively simplified, so that the coding and decoding process of the chrominance block can be simplified, the coding and decoding complexity can be reduced, and the coding and decoding efficiency can be improved.

The invention relates to a high-efficiency non-I-frame image encoding and decoding method, which comprises the following steps of: detecting an original video sequence of a non-I-frame image at an image level by adopting a preset division rule, determining an image of an approximate static frame according to the preset division rule, and setting an identification bit of the image to be true, otherwise, setting an image identification bit to be false; writing the identification bit into a code stream; for the current frame image with the frame level identification being true, enabling each coding unit to directly adopt a preset new coding mode for coding, and writing coding information of the preset new coding mode into a code stream; and for a current frame image with a false frame level identifier, enabling each coding unit to still perform coding unit division and pre-coding on the image according to an originally set coding method, and writting division information and optimal coding mode information of each coding unit into a code stream. According to the invention, the coding and decoding complexity can be reduced, and the coding and decoding efficiency can be improved.