35results about How to "Improve encoding and compression efficiency" patented technology

The invention relates to a method for guiding coding quantization process by visual perception characteristics. The method includes the following operating steps that (1) a brightness value of each frame of an input video sequence is read, and a just noticeable distortion threshold value model of a frequency domain is established; (2) prediction on each frame passing through the viewpoints and between the viewpoints in the input video sequence is performed; (3) residual error data are subjected to discrete cosine transform; (4) a quantifying step size of each macro block in the current frame is dynamically adjusted; (5) lagrangian parameters in a rate-distortion optimization process are dynamically adjusted; and (6) quantized data are subjected to entropy coding to form a code stream, and the code stream is transmitted through network. By means of the method, the video compression efficiency is improved under the condition that subjective qualities are basically unchanged, and the video is suitable for being transmitted in the network.

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 application discloses an image coding method and device. The method comprises: determining a coded area of a current frame; determining a search area in the coded area; searching for a prediction block matching a block to be coded of the current frame in the search area; and utilizing the prediction block to code the block to be coded. The image coding method and device can improve image coding efficiency.

The invention discloses a panoramic video diamond sampling method and device. The method comprises the following steps of dividing a spherical surface into N=2K ring curved surfaces by using equally spaced latitudes according to a spatial resolution requirement, and orderly marking the ring curved surfaces as Oi; evenly dividing the ring curved surfaces Oi into Ti=2N-2-4M areas by using equally spaced longitudes; calculating and obtaining an average value of light rays in each area on the spherical surface as sampling values of sampling points corresponding to the area; and arranging the sampling values into one NxN matrix. The panoramic video diamond sampling method provided by the invention can enable the sampling points to meet the characteristics that the sampling points are more near the equator and the sampling points are less at the two poles on the spherical surface; the distribution characteristic of the number of the sampling points has the property of diamond distribution on a longitude and latitude graph, so that it is called the diamond sampling. The sampling method avoids sampling structure redundancy, so that the number of the sampling points is reduced and the amount of data after sampling is reduced under the condition that the same spatial resolution is achieved.

The invention discloses a panoramic video hexagonal sampling method and apparatus. The method comprises the following steps: dividing a spherical surface into N=6 annular curved surfaces by using latitude lines with equal intervals, making the annular curved surfaces as Oi in sequence, i = 0, and 1 ,... N-1, observing from the angle of the centre of sphere, and arranging the Oi from top to bottom; uniformly dividing the annular curved surface Oi into Ti areas by using meridians with equal intervals; calculating an average value of light within each area on the spherical surface to serve as a sampling value of a sampling point corresponding to the area; and arranging the sampling values in a matrix. By adoption of the sampling method, the redundancy of the sampling structure is avoided, and under the condition of realizing the same spatial resolution, the number of the sampling points is reduced, and the data size after sampling is reduced.

The embodiments of the present invention relate to a video processing method, an encoding device and a decoding device. The method includes: receiving video data, the video data being divided into multiple frames; calculating a Lagrangian multiplier of a current prediction block in a current coding block, the current prediction block being a section of video signal in the current coding block, The current coding block is located in the current frame, and the current frame is one of the plurality of frames; using the Lagrangian multiplier of the current prediction block to encode the current prediction block according to the rate-distortion optimization algorithm, to obtain the current The encoding result of the predicted block; sending the encoding result of the current predicted block to the decoding end. The video processing method, encoding device, and decoding device of the embodiments of the present invention can improve encoding and compression efficiency.

The method comprises: dividing video data in each channel collected by multi video cameras into multi viewpoint groups in term of their adjacent location in the collection; each viewpoint group has identical numbers of viewpoints; in each viewpoint group, using the predictive coding relating between the viewpoints; each viewpoint uses same coding approach.

The invention discloses an intraframe prediction performance improvement encoding method. According to the method, prediction sample values are generated by use of mixed four-tap interpolation filtering, including DCT-based interpolation filtering and Gauss interpolation filtering, and for different prediction unit blocks, types of used interpolation filters are determined according to a given threshold; angle prediction mode classification is performed, i.e., intraframe angle prediction modes are classified into three types for carrying out different encoding processing; and boundary prediction sample smooth filtering is performed, i.e., final encoding prediction signals are generated by filtering boundary column or boundary row samples of prediction blocks by use of pixel differences between reference samples. According to the invention, through combination of direction features of intraframe angle prediction and space correlation of the reference samples, the generation process of the prediction signals is optimized, the prediction precision is improved, and better encoding compression performance is obtained.

The invention discloses an image brightness compensation method for image coding, belongs to the field of image processing, and solves the problems of over complexity, low speed and low compression efficiency of the conventional algorithm for performing brightness compensation for multi-viewpoint video coded images. The image brightness compensation method comprises the following steps: determining brightness difference between a current block P0 and a reference block PS by comparing the brightness difference between a current block template X0 and a reference block template XS, thereby realizing the brightness compensation for the current block; and utilizing a formula to calculate a series of solved candidate weight matrixes B alpha, solving the optimal Bj and assigning the optimal Bj to weight matrixes B of the reference block PS according to another formula, thereby solving the brightness difference between the current block template X0 and the reference block template XS according to B(X0T-XST), which serves as the brightness difference between the current block P0 and the reference block PS for brightness compensation.

The invention discloses a PMS coding compression method and device. The method comprises the following steps: searching character coding values of 16 bytes corresponding to codes of 16 bytes of electrical equipment according to a preset coding table; storing the character coding values of 16 bytes according to such a manner that each 4 bytes form a group and each byte contains 6 bits, wherein each group contains character coding values of 24 bits; coding the character coding values of 24 bits in each group according to such a manner that each byte contains 8 bits, and compressing 4 types in each group into 3 bits in each group. By adoption of the PMS coding compression method and device disclosed by the invention, the technical problem that the codes of the electrical equipment in a PMS system do not satisfy the storage capacity and the storage format of an EPC area of a RFID label in the prior art is solved.

The invention discloses a method for compressing light field data based on homography transformation, comprising: inputting the original light field data set Φ(S 1 ,S 2 ,...,S i ), the sub-aperture image S i Divided into central sub-aperture image C i and the corresponding neighborhood subaperture image A i‑j ; According to the central sub-aperture image C i and the corresponding neighborhood subaperture image A i‑j Find the homography matrix H i‑j , based on the homography transformation, the neighborhood sub-aperture image A i‑j projected onto the central subaperture image C i The transformed neighborhood sub-aperture image A′ is obtained on the imaging plane i‑j , the transformed neighborhood sub-aperture image A′ i‑j with the central subaperture image C i Subtract to get the residual map R i‑j ; For all central sub-aperture images C in the original light field data set i and the residual image R i‑j scan separately to generate the central video sequence V C and the residual video sequence V R ; Center video sequence V C and the residual video sequence V R compressed separately. The present invention effectively reduces redundant information in the air domain, thereby effectively improving coding efficiency.

The embodiment of the invention relates to a method and a device for scaling motion vectors, and a method and a system for coding / decoding. The method for scaling motion vector comprises that: according to the amount of coordinate offset between a bottom field and a top field of an interlaced scanned image, coordinate transformation is performed on a first motion vector so as to obtain a second motion vector; the second motion vector is scaled so as to obtain a third motion vector; and according to the amount of coordinate offset, coordinate inverse transformation is performed to the third motion vector so as to obtain a fourth motion vector. The embodiment of the invention performs half-pixel compensation or coordinate transformation on the motion vectors before and after being scaled according to the offset of a top-field image and a bottom-field image in spatial positions, transforms a coordinate into a coordinate system reflecting the actual position relation of the images, and then scales the motion vector, thereby having the advantages of according with motion models better, guaranteeing the accuracy of scaling the motion vectors, raising the precision of predicting the motion vectors and improving the efficiency of coding and compressing field images.

The invention discloses an encoding method for rapidly encoding a gene character sequence into a binary sequence. The encoding method comprises the steps of: 1, taking out a specified number of character strings from a gene character sequence to be encoded and using the taken character strings as currently processed character strings; 2, shifting binary codes of the currently processed character strings right by one bit; 3, carrying out a data AND-operation on each character in the currently processed character string shifted right by one bit and 0x3; 4, respectively extracting and assembling two lowest bits in each character in a result after the data AND-operation to obtain a compact code binary sequence corresponding to the currently processed character strings; and 5, judging whether processing on the gene character sequence to be encoded is completed, skipping to execute the step 1 if processing is not completed, otherwise ending and exiting. The encoding method has the advantages of high encoding compression efficiency, high encoding speed, high encoding efficiency, no requirement for carrying out case change, flexible implementing mode and wide application range.

The invention provides a video image coding / decoding methods and devices as well as a video image coding and decoding system. The coding method comprises the following steps: sampling and decomposing a macro-block of a video image frame so as to acquire a plurality of blocks which at least comprise a first block, a second block and a third block; performing the intra-frame predictive coding treatment on the first block so as to obtain the reconfiguration image value of the first block; performing the i predictive coding treatment on the second block by referring to the reconfiguration image value of the first block so as to acquire the reconfiguration image value of the second block; and performing the predictive coding treatment on the third block by referring to the reconfiguration image value of the second block. According to the embodiment of the invention, the relativity among pixels can be fully utilized, thus the prediction precision and the code compressing efficiency of the video image is increased.

The invention relates to an intra-frame prediction method, which increase the intra-frame prediction compression efficiency and comprises the following steps: (1) a brightness intra-frame prediction processing unit is selected according to the image coding frame size; (2) the sizes and the prediction modes of a brightness intra-frameprediction subblock and a chroma intra-frame prediction subblock are selected respectively; (3) the intra-frame prediction is performed according the selected sizes and the prediction modes of the brightness intra-frame prediction subblock and the chroma intra-frame prediction subblock to obtain an intra-frame prediction sampling value and a residual error of the intra-frame prediction subblocks;and (4) the coding mode of the intra-frame prediction subblocks, the brightness intra-frame prediction mode as well as the chroma intra-frame prediction mode and the residual error are coded respectively and then are sent to a code stream. The classification of the intra-frame prediction method is mainly aimed at the circumstances that the sizes of the intra-frame prediction subblocks are 4*8, 8*4, 8*16 and 16*8, and five optional prediction modes are matched, so that 3 percent to 5 percent of code stream bandwidth is saved under the condition that the image quality is identical, and the image encoding compression efficiency is increased; and the effect of simplifying the computational complexity can be also achieved due to the selection of partial prediction modes.