Panasonic Intellectual Property Corporation of America

Panasonic Corporation

Godo Kaisha IP Bridge 1

Matsushita Electric Industrial Co., Ltd.

Panasonic Intellectual Property Management Co., Ltd.

Tagivan Ii LLC

Panasonic Intellectual Property

Intellectual Property Corporation of America

Panasonac Corporation

Kiyofumi Abe

Takahiro Nishi

Tadamasa Toma

Shinya Kadono Kadono

Satoshi Kondo

Makoto Hagai

Ryuichi Kanoh

Chong Soon Lim

Han Boon Teo

Hai Wei Sun

Jing Ya Li

Yusuke Kato

Ru Ling Liao

Sughosh Pavan Shashidhar

Chu Tong Wang

Che Wei Kuo

Takashi Hashimoto

Hideyuki Ohgose

Virginie Drugeon

Che-Wei Kuo

Hiroshi Arakawa

Kazuhito Kimura

Masato Ohkawa

Hideo Saitou

Koji Arimura

Sheng Mei Shen

Teck Wee Foo

Tatsuro Juri

Kazuma Sakakibara

Yuki Maruyama

Masayasu Iguchi

Hiroaki Toida

Luca Rigazio

Shinji Kitamura

Masayoshi Tojima

Toshihiko Kusakabe

Alec Hodgkinson

Hiroshi Ikeda

Syouzou Fujii

Shinjiro Mizuno

Youji Shibahara

Viktor Wahadaniah

Takeshi Tanaka

Takashi Sugimoto

Naoki Yoshimatsu

Rohith Mars

Katsuki Urano

Makoto Adachi

Shen Sheng Mei Mei

Kadono Shinya

An encoder including circuitry and memory coupled to the circuitry. In a second type of residual coding among a first type of residual coding where an orthogonal transform is applied to a current block and the second type of residual coding where the orthogonal transform is skipped for the current block, wherein a first syntax used for the first type of residual coding is different from a second syntax used for the second type of residual coding, the circuitry: in a first loop process, derives a context index by using at least one of a plurality of surrounding coefficients; and encodes a plurality of coefficient information flags by CABAC with the derived context index; and in a second loop process of the plurality of loop processes, encodes a plurality of absolute value flags by CABAC with another context index.

Encoder for encoding a plurality of coefficient information flags and encoding a plurality of absolute value flags

An encoder includes circuitry, and memory coupled to the circuitry. The circuitry, in operation, for each of a plurality of sub-bitstreams having mutually different frame rates, encodes identification information into a header of a bitstream including the plurality of sub-bitstreams, the identification information indicating a temporal ID that is an identifier of a temporal layer related to a temporal scalability and corresponds to the sub-bitstream, and encodes level information indicating a conformance level of the sub-bitstream.

Encoder for encoding information of sub-bitstreams having mutually different frame rates

An encoder that switches whether or not to store a first parameter included in hypothetical reference decoder (HRD) parameters related to a decoding unit into a buffering period supplemental enhancement information (SEI) message according to a second flag stored into the buffering period SEI message. The second flag indicates whether or not the HRD parameters related to the decoding unit are present, and a value of the second flag being equal to a value of a first flag stored in a sequence parameter set. The first flag indicates whether or not the HRD parameters are present.

Encoder that switches whether or not to store a first parameter into a buffering period supplemental enhancement information message according to a flag

Provided is an encoder including: circuitry; and memory coupled to the circuitry, in which the circuitry: derives a prediction residual indicating a difference between a current block and a prediction image of the current block; performs primary transform on the prediction residual, and performs secondary transform on a result of the primary transform; performs quantization on a result of the secondary transform; and encodes a result of the quantization. In the performing of the secondary transform, when a matrix weighted intra prediction included in intra prediction and having prediction modes is used, the circuitry uses, as a transform set for the secondary transform, a common transform set shared among the prediction modes. The matrix weighted intra prediction generates the prediction image by performing matrix calculation on a pixel sequence obtained from pixel values of surrounding pixels of the current block.

Encoder, decoder, encoding method, and decoding method

An encoder includes memory and circuitry. The circuitry: derives a first motion vector in a unit of a prediction block using a first inter frame prediction mode that uses a degree of matching between two reconstructed images of two regions in two difference pictures, the prediction block being obtained by splitting an image included in a video; and performs, in the unit of the prediction block, a first motion compensation process that generates a prediction image by referring to a spatial gradient of luminance in an image generated by performing motion compensation using the first motion vector derived.

An encoder includes circuitry and memory. The circuitry, in operation, generates a first coefficient value by applying a CCALF (cross component adaptive loop filtering) process to a first reconstructed image sample of a luma component. The circuitry generates a second coefficient value by applying an ALF (adaptive loop filtering) process to a second reconstructed image sample of a chroma component. The circuitry generates a third coefficient value by adding the first coefficient value to the second coefficient value, and encodes a third reconstructed image sample of the chroma component using the third coefficient value. In the CCALF process, in response to a coordinate of the second reconstructed image sample being (x, y), coordinates of the first reconstructed image samples are (2x, 2y−1), (2x−1, 2y), (2x, 2y), (2x+1, 2y), (2x−1, 2y+1), (2x, 2y+1), (2x+1, 2y+1), and (2x, 2y+2).

System and method for video coding

An encoder that encodes a current block to be encoded in an image is provided. The encoder includes: processor; and memory coupled to the processor, in which, in operation, the processor: generates a first prediction image based on a motion vector, the first prediction image being an image with full-pel precision; generates a second prediction image using an interpolation filter by interpolating a value at a fractional-pel position between full-pel positions included in the first prediction image; and encodes the current block based on the second prediction image, and in the using of the interpolation filter, the interpolation filter is switched between a first interpolation filter and a second interpolation filter differing in a total number of taps from the first interpolation filter.

Method of transmitting a bitstream including an encoded signal and syntax information to which a decoder performs a decoding method of decoding a current block based on a prediction image generated using an interpolation filter

An encoder includes circuitry and memory coupled to the circuitry. In operation, the circuitry determines whether a determined relationship between a total number of one or more layer groups and a total number of one or more parameters is satisfied. The one or more layer groups each include at least one output layer, and the one or more parameters each indicate a performance requirement for a decoder. When the determined relationship is satisfied, the circuitry determines, using a determined method, a correspondence relationship for associating any of the one or more parameters with each of the one or more layer groups, and omits storing information indicating the correspondence relationship in a common header shared between layers in the one or more layer groups.

A decoder includes circuitry and memory. Using the memory, the circuitry, in a first operating mode, derives first motion vectors for a first block obtained by splitting a picture, using a first inter prediction scheme, and generates a prediction image corresponding to the first block, by referring to spatial gradients of luminance generated based on the first motion vectors. Using the memory, the circuitry, in a second operating mode, derives second motion vectors for a sub-block obtained by splitting a second block, using a second inter prediction scheme different from the first inter prediction scheme, the second block being obtained by splitting the picture, and generates a prediction image corresponding to the sub-block without referring to spatial gradients of luminance.

An encoder partitions into blocks using a set of block partition modes. The set of block partition modes includes a first partition mode for partitioning a first block, and a second block partition mode for partitioning a second block which is one of blocks obtained after the first block is partitioned. When the number of partitions of the first block partition mode is three, the second block is a center block among the blocks obtained after partitioning the first block, and the partition direction of the second block partition mode is same as the partition direction of the first block partition mode, the second block partition mode indicates that the number of partitions is only three. A parameter for identifying the second block partition mode includes a first flag indicating a horizontal or vertical partition direction, and does not include a second flag indicating the number of partitions.

Encoder, decoder, encoding method, decoding method, and recording medium

For a location displaced by four samples in a vertical direction or a horizontal direction from a current location, the encoder performs a first determination of determining only whether the location displaced by four samples is a TU boundary, where the current location is a sample location of a current sub-block boundary on which the determination process is to be performed. In the first determination, when it is determined that the location displaced by four samples is a TU boundary, the encoder sets a maximum filter length to a first value, and in the case otherwise, the encoder performs a second determination of determining whether a location displaced by eight samples in the vertical direction or the horizontal direction from the current location is a TU boundary.

Various embodiments provide an encoder that generates a plurality of quantization matrix elements for a current block; generates a quantization matrix using the plurality of quantization matrix elements; and quantizes, using the quantization matrix, transform coefficients of the current block. The quantization matrix includes only a subset of quantization matrix elements of the plurality of quantization matrix elements. Each of the subset of quantization matrix elements has an x-coordinate value less than a threshold x-coordinate value, a y-coordinate value less than a threshold y-coordinate value, or an x-coordinate value less than the threshold x-coordinate value and a y-coordinate value less than the threshold y-coordinate value.

Encoder, decoder, and related non-transitory computer readable medium

An encoder includes: circuitry; and memory coupled to the circuitry. In operation, the circuitry: controls whether to change a resolution of a picture from a resolution of a previous picture preceding the picture in one of display order and encoding order, according to a constraint that allows the changing only when the picture is a random access picture among one or more random access pictures; and when a resolution of a reference picture to be used in encoding of an inter-predicted picture is different from a resolution of the inter-predicted picture, resamples a reference image in the reference picture according to a difference between the resolution of the reference picture and the resolution of the inter-predicted picture, and encodes an image in the inter-predicted picture using the reference image resampled.

An encoder includes memory and circuitry which: (i) encodes an image block; (ii) when encoding the image block: binarizes coefficient information indicating coefficients of the image block; and controls whether to apply arithmetic encoding to a binary data string obtained by binarizing the coefficient information; and (iii) when binarizing the coefficient information: binarizes the coefficient information according to a first syntax structure when arithmetic encoding is applied to the data string and a predetermined condition is not satisfied; binarizes the coefficient information according to a second syntax structure when arithmetic encoding is applied to the data string and the predetermined condition is satisfied; binarizes the coefficient information according to the second syntax structure when no arithmetic encoding is applied to the data string; and subtracts 1 from a value of an initial non-zero coefficient when no arithmetic encoding is applied to the data string when encoding the image block.

An image encoder is provided including circuitry and a memory coupled to the circuitry. The circuitry, in operation, responds to a size of a block satisfying a size condition by generating a prediction image using a prediction mode selected from a plurality of prediction modes. The plurality of prediction modes include a first prediction mode in which a prediction process uses a motion vector and a reference block in a same picture as the block. The circuitry encodes the block using the prediction image.

Image encoder, image decoder, image encoding method, and image decoding method

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Osaka, Japan

Kiyofumi Abe