Texas Instruments Corporation

Samsung Electronics Co., Ltd.

Madhukar Budagavi

Vivienne Sze

Do-Kyoung Kwon

Rajan Laxman Joshi

Minhua Zhou

Hossein Najaf-Zadeh

Mehmet Umut Demircin

Esmaeil Faramarzi

Woo-Shik Kim

Akira Osamoto

Youngkwon Lim

Mangesh Devidas Sadafale

Indranil Sinharoy

Ming-Jun Chen

Ankur Saxena

Ying Chen

Hyung Joon Kim

Ajit Deepak Gupte

Neha Dawar

Yasutomo Matsuba

Tuan Ho

Imed Bouazizi

Veeramanikandan Raju

Goksel Dedeoglu

Andrew Joseph Dickerson

Saifeng Ni

Felix Carlos Fernandes

Sungryeul Rhyu

Rajendra K Talluri

Abhishek Sehgal

Nishith D Tripathi

Ravindranath Kanamangala

Jeffrey Wilkinson

John Furton

Guoxin Jin

Wendi B Heinzelman

Young-Kwon Lim

A method for encoding a video sequence is provided that includes entropy encoding syntax elements representative of transform coefficients generated as the video sequence is processed, wherein entropy encoding syntax elements representative of a transform coefficient includes binarizing the syntax elements representative of the transform coefficient to generate a plurality of binary symbols (bins), coding a portion of the plurality of bins in context coding mode, and coding a remaining portion of the plurality of bins in bypass coding mode. The method further includes reducing the number of bins that are coded in context coding mode for each transform coefficient in a plurality of subsequent transform coefficients that are entropy encoded after a specified number of transform coefficients have been entropy encoded.

Context adaptive binary arithmetic coding and bypass coding

An apparatus includes a communication interface configured to receive a bitstream for a compressed video and a processor operably coupled to the communication interface. The processor is configured to decode the bitstream for the compressed video and obtain reference samples associated with a block of a video frame. The processor is also configured to determine an interpolation filter type for use in obtaining predicted samples. The processor is also configured to select an interpolation filter of the interpolation filter type based on a block size of the block of the video frame. The processor is also configured to apply the interpolation filter to the reference samples. The processor is also configured to output one or more predicted samples using the interpolated reference samples.

Block-based reference sample interpolation filter optimization for video

A method of encoding a video stream in a video encoder is provided that includes computing an offset into a transform matrix based on a transform block size, wherein a size of the transform matrix is larger than the transform block size, and wherein the transform matrix is one selected from a group consisting of a DCT transform matrix and an IDCT transform matrix, and transforming a residual block to generate a DCT coefficient block, wherein the offset is used to select elements of rows and columns of a DCT submatrix of the transform block size from the transform matrix.

Transform and quantization architecture for video coding

An apparatus comprises a communication interface configured to receive a compressed bitstream including a vertex motion vector information. The vertex motion vector information comprises one or more components. The apparatus comprises a processor operably coupled to the communication interface. The processor is configured to cause parsing the compressed bitstream including the vertex motion vector information, selecting contexts for a plurality of bins of a first component of the vertex motion vector information, wherein a first prefix bin of the first component is coded based on a first context, remaining prefix bins of the first component are coded based on a second context, and one or more suffix bins of the first component are coded using bypass coding, and decoding the first component of the vertex motion vector information based on the selected contexts.

Vertex motion vector coding and decoding

A method for adaptive loop filtering is provided that includes determining a coefficient value for each coefficient position of an adaptive loop filter, applying the adaptive loop filter to at least a portion of a reconstructed picture using the coefficient values, and entropy encoding coefficient values into a compressed bit stream using predetermined short binary codes, wherein the short binary code used depends on the coefficient position of the coefficient value.

Reduced complexity coefficient transmission for adaptive loop filtering (ALF)

An encoded bitstream of entropy encoded video data is received by a video decoder. The encoded bitstream represents syntax elements of a sequence of coding blocks. The sequence of coding blocks is recovered by processing a bin sequences associated with each coding block in a processing pipeline, wherein a defined amount of time is allocated to process each coding block in the processing pipeline. The encoded bitstream is arithmetically decoded to produce each bin sequence. The arithmetic decoder is time-wise decoupled from the processing pipeline by storing a plurality of the bin sequences in a buffer memory.

CABAC decoder with decoupled arithmetic decoding and inverse binarization

A method for point cloud encoding includes generating, for a three-dimensional (3D) point cloud, video frames and atlas frames that includes pixels representing information about the 3D point cloud, wherein atlas tiles represent partitions in the atlas frames and video tiles represent partitions in the video frames. The method also includes setting a value for a syntax element according to relationships between sizes of the video tiles and sizes of the atlas tiles. The method further includes encoding the video frames and the atlas frames to generate video sub-bitstreams and an atlas sub-bitstream, respectively. Additionally, the method includes generating a bitstream based on the atlas sub-bitstream, the video sub-bitstreams, and the syntax element and transmitting the bitstream.

Tiling for video based point cloud compression

A method for in-loop filtering in a video encoder is provided that includes determining filter parameters for each filtering region of a plurality of filtering regions of a reconstructed picture, applying in-loop filtering to each filtering region according to the filter parameters determined for the filtering region, and signaling the filter parameters for each filtering region in an encoded video bit stream, wherein the filter parameters for each filtering region are signaled after encoded data of a final largest coding unit (LCU) in the filtering region, wherein the in-loop filtering is selected from a group consisting of adaptive loop filtering and sample adaptive offset filtering.

Flexible region based sample adaptive offset (SAO) and adaptive loop filter (ALF)

A method for decoding an encoded video bit stream in a video decoder is provided that includes decoding an intra prediction mode for a block of pixels encoded in the video bit stream, determining, based on the intra prediction mode, whether or not a smoothing filter is to be applied to reference pixel values used for intra prediction of the block, applying a smoothing filter to the reference pixel values when a result of the determining is that a smoothing filter is to be applied, and performing intra prediction according to the intra prediction mode using the smoothed reference pixel values to generate a predicted block of pixels.

Mode adaptive intra prediction smoothing in video coding

An apparatus includes a communication interface configured to receive a bitstream for a compressed video and a processor operably coupled to the communication interface. The processor is configured to decode the bitstream for the compressed video. The processor is also configured to identify a mapping of view numbers of a plurality of images and a plurality of subpicture identifiers, each of the plurality of subpicture identifiers associated with a defined location in a video frame, wherein the mapping is signaled in the bitstream, and wherein each one of the view numbers is assigned to one image of the plurality of images based on a corresponding one of a plurality of camera viewpoints of a scene. The processor is also configured to instruct a display of at least one image based on at least one of the plurality of images.

Signaling of multiview tiled volumetric video

An apparatus comprises a communication interface and a processor operably coupled to the communication interface. The communication interface is configured to receive a compressed bitstream including association information between scene objects and submeshes. The processor is configured to determine an index of a scene object, decode the association information between scene objects and submeshes, determine an identifier of a submesh based on the association information and the index of the scene object, and reconstruct the submesh based on the identifier.

Submesh coding for dynamic mesh coding

An apparatus includes a communication interface and a processor operably coupled to the communication interface. The processor is configured to form an LOD signal corresponding to a displacement field. The processor is further configured to identify one or more samples of the LOD signal. The processor is further configured to determine whether a set of values of the one or more samples has a positive skew or a negative skew and set a skew flag. The processor is further configured to convert the set of values to a set of unsigned symbols according to the determined positive skew or negative skew. The processor is further configured to perform binarization on the converted set of values. The processor is further configured to produce an output bitstream including encoding the LOD signal using the converted and binarized set of values and encoding the skew flag in the output bitstream.

Coding of displacements using skew flag for vertex mesh (V-MESH)

A method for encoding a video sequence in a video encoder is provided that includes adapting a quantization parameter of a block of pixels in a picture of the video sequence based on a transform block size of the block of pixels to determine a final quantization parameter, and quantizing transform coefficients of the block of pixels using the final quantization parameter.

Block artifact suppression in video coding

An apparatus for three dimensional (3D) art viewing includes one or more sensors and a processor operably coupled to the one or more sensors. The processor is configured to detect, using the one or more sensors, a position of a user. The processor is additionally configured to output, for display, an aspect of an image based on the position of the user. The processor is also configured to obtain, using the one or more sensors, movement data associated with a movement of the user. The processor is further configured to apply temporal smoothing to smooth the movement data. In addition, the processor is configured to map the smoothed movement data to a series of view indices. The processor is also configured to change the aspect of the image for display based on the mapped series of view indices.

3D arts viewing on display devices

Techniques for context-adaptive binary arithmetic coding (CABAC) coding with a reduced number of context coded and/or bypass coded bins are provided. Rather than using only truncated unary binarization for the syntax element representing the delta quantization parameter and context coding all of the resulting bins as in the prior art, a different binarization is used and only part of the resulting bins are context coded, thus reducing the worst case number of context coded bins for this syntax element. Further, binarization techniques for the syntax element representing the remaining actual value of a transform coefficient are provided that restrict the maximum codeword length of this syntax element to 32 bits or less, thus reducing the number of bypass coded bins for this syntax element over the prior art.

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Plano, TX, United States of America

Madhukar Budagavi