Initial-value ordinary differential equation solution via variable order Adams method (SIVA/DIVA) package is collection of subroutines for solution of nonstiff ordinary differential equations. There are versions for single-precision and double-precision arithmetic. Requires fewer evaluations of derivatives than other variable-order Adams predictor/ corrector methods. Option for direct integration of second-order equations makes integration of trajectory problems significantly more efficient. Written in FORTRAN 77.

Solving Ordinary Differential Equations

High Efficiency Video Coding (HEVC) is the latest joint standardization effort of ITU-T WP 3/16 and ISO/IEC JTC 1/SC 29/WG 11. The resultant standard will be published as twin text by ITU-T and ISO/IEC; in the latter case, it will also be known as MPEG-H Part 2. This paper describes the block partitioning structure of the draft HEVC standard and presents the results of an analysis of coding efficiency and complexity. Of the many new technical aspects of HEVC, the block partitioning structure has been identified as representing one of the most significant changes relative to previous video coding standards. In contrast to the fixed size 16 × 16 macroblock structure of H.264/AVC, HEVC defines three different units according to their functionalities. The coding unit defines a region sharing the same prediction mode, e.g., intra and inter, and it is represented by the leaf node of a quadtree structure. The prediction unit defines a region sharing the same prediction information. The transform unit, specified by another quadtree, defines a region sharing the same transformation. This paper introduces technical details of the block partitioning structure of HEVC with an emphasis on the method of designing a consistent framework by combining the three different units together. Experimental results are provided to justify the role of each component of the block partitioning structure and a comparison with the H.264/AVC design is performed.

Block Partitioning Structure in the HEVC Standard

The emerging high efficiency video coding standard (HEVC) adopts the quadtree-structured coding unit (CU). Each CU allows recursive splitting into four equal sub-CUs. At each depth level (CU size), the test model of HEVC (HM) performs motion estimation (ME) with different sizes including 2N × 2N, 2N × N, N × 2N and N × N. ME process in HM is performed using all the possible depth levels and prediction modes to find the one with the least rate distortion (RD) cost using Lagrange multiplier. This achieves the highest coding efficiency but requires a very high computational complexity. In this paper, we propose a fast CU size decision algorithm for HM. Since the optimal depth level is highly content-dependent, it is not efficient to use all levels. We can determine CU depth range (including the minimum depth level and the maximum depth level) and skip some specific depth levels rarely used in the previous frame and neighboring CUs. Besides, the proposed algorithm also introduces early termination methods based on motion homogeneity checking, RD cost checking and SKIP mode checking to skip ME on unnecessary CU sizes. Experimental results demonstrate that the proposed algorithm can significantly reduce computational complexity while maintaining almost the same RD performance as the original HEVC encoder.

An Effective CU Size Decision Method for HEVC Encoders

This paper provides a technical overview of a newly added in-loop filtering technique, sample adaptive offset (SAO), in High Efficiency Video Coding (HEVC) The key idea of SAO is to reduce sample distortion by first classifying reconstructed samples into different categories, obtaining an offset for each category, and then adding the offset to each sample of the category The offset of each category is properly calculated at the encoder and explicitly signaled to the decoder for reducing sample distortion effectively, while the classification of each sample is performed at both the encoder and the decoder for saving side information significantly To achieve low latency of only one coding tree unit (CTU), a CTU-based syntax design is specified to adapt SAO parameters for each CTU A CTU-based optimization algorithm can be used to derive SAO parameters of each CTU, and the SAO parameters of the CTU are inter leaved into the slice data It is reported that SAO achieves on average 35% BD-rate reduction and up to 235% BD-rate reduction with less than 1% encoding time increase and about 25% decoding time increase under common test conditions of HEVC reference software version 80

Sample Adaptive Offset in the HEVC Standard

There is disclosed a method, an apparatus, a server, a client and a non-transitory computer readable medium comprising a computer program stored therein for video coding and decoding. Depth pictures from a plurality of viewing angles are projected into a single viewing angle, making it possible to have pixel-wise joint filtering to be applied to all projected depth values. This approach enables to suppress the noise in the depth map data and provides improved performance for a view synthesis.

Apparatus, a method and a computer program for video coding and decoding

FIELD: computer engineeringSUBSTANCE: invention relates to computer engineering Disclosed is a method of decoding video, which comprises obtaining from a bit stream information on a method of determining a group of pixels, to be compensated; when information on method of determining group of pixel to be compensated is obtained, obtaining a compensation from a bit stream; when group of pixels to be compensated is determined, according to bands based on information on method of determining group of pixels to be compensated, applying a compensation value to pixel, corresponding to band among pixels of current block; and when determined group of pixels to be compensated, according to level of limit value based on information on method of determining group of pixels to be compensated, applying compensation value to pixel, corresponding to level of limiting value, among pixels of current block, wherein band is one of multiple bands, wherein multiple bands are generated by splitting overall range of pixel values of one or more pixels in current blockEFFECT: technical result consists in improvement of quality of reconstructed image1 cl, 22 dwg, 2 tbl

Method and apparatus for encoding video and method and apparatus for decoding video through pixel value compensation in accordance with pixel groups

A video encoding method and apparatus, and a video decoding method and apparatus for generating a reconstructed image having a minimized error between an original image and the reconstructed image. The video decoding method accompanied by a sample adaptive offset (SAO) adjustment, the method includes: obtaining slice SAO parameters with respect to a current slice from a slice header of a received bitstream; obtaining luma SAO use information for a luma component of the current slice and chroma SAO use information for chroma components thereof from among the slice SAO parameters; determining whether to perform a SAO operation on the luma component of the current slice based on the obtained luma SAO use information; and equally determining whether to perform the SAO adjustment on a first chroma component and a second chroma component of the current slice based on the obtained chroma SAO use information.

Method for encoding videos sharing sao parameter according to color component

FIELD: data processing.SUBSTANCE: invention relates to encoding and decoding video. Video motion compensation apparatus comprises receiving information of a partition type of a current coding unit and determining a size of a current prediction unit by using a processor. L0-list of reference pictures comprising a direct reference image and a reverse reference image, and an L1-list comprising a reverse reference image and a direct reference image are being determined. Bit indicating one of an L0 prediction, is being obtained, an L1 prediction and bi-prediction for the current prediction unit by performing context, based entropy decoding on the bitstream using the first or the second context model for the first or the second element of the list, and L0 prediction, L1 prediction or bi-prediction are being performed according to the bit. L0 prediction accesses the L0 list, L1 prediction accesses the L1 list and bi-prediction accesses the L0 list and the L1 list.EFFECT: reduced number of transmitted bits and simplified syntax data analysis.3 cl, 27 dwg, 1 tbl

Method and apparatus for encoding video and method and apparatus for decoding video, determining the list of reference external prediction image depending on the unit size

According to a video encoding method and apparatus and a video decoding method and apparatus of the invention, a first predicted coding unit of a current coding unit that is to be encoded is produced, a second predicted coding unit is produced by changing a value of each pixel of the first predicted coding unit by using each pixel of the first predicted coding unit and at least one neighboring pixel of each pixel, and the difference between the current coding unit and the second predicted coding unit is encoded, thereby improving video prediction efficiency.

Video encoding method and apparatus and a video decoding method and apparatus

PROBLEM TO BE SOLVED: To provide a video decoding method and apparatus.SOLUTION: Entropy decoding of a bit stream is performed to obtain offset type information of a luma component and a chroma component of a current block. If the offset type information of the luma component indicates a band offset type, entropy decoding is performed in a bypass mode to obtain information indicating a starting position of a sample value band of the luma component of the current block. If the offset type information of the luma component indicates an edge offset type, entropy decoding is performed in a bypass mode to obtain a class indicating an edge direction of the luma component of the current block. If the offset type information of the luma component indicates the band offset type, entropy decoding is performed to obtain an absolute value and code information of offset of the luma component of the current block. If the offset type information of the chroma component indicates a band offset type, entropy decoding is performed to obtain an absolute value and code information of offset of the chroma component of the current block.SELECTED DRAWING: Figure 2A

Elena Alshina

Papers

Method and apparatus for encoding video and method and apparatus for decoding video through pixel value compensation in accordance with pixel groups

Method for encoding videos sharing sao parameter according to color component

Method and apparatus for encoding video and method and apparatus for decoding video, determining the list of reference external prediction image depending on the unit size

Video encoding method and apparatus and a video decoding method and apparatus

Video decoding method and apparatus therefor