Panasonic Intellectual Property Corporation of America

Panasonic Corporation

Panasonic Intellectual Property Management Co., Ltd.

Matsushita Electric Industrial Co., Ltd.

Sharp Kabushiki Kaisha Corporation

Mitsubishi Denki Kabushiki Kaisha

Panasonic Corportion

Takashi Hashimoto

Kiyofumi Abe

Takahiro Nishi

Tadamasa Toma

Ryuichi Kanoh

Takashi Morimoto

Takeshi Tanaka

Hiroshi Amano

Yoshiteru Hayashi

Hideyuki Ohgose

Shinji Kitamura

Hiroto Tomita

Toshihiko Kusakabe

Tatsuro Juri

Yuki Maruyama

Akihiko Inoue

Koji Kai

Takeshi Nakayama

Kazuhiro Watanabe

Tokuzo Kiyohara

Masayoshi Tojima

Takashi Yamada

Masayuki Iwamoto

Shinichi Uramoto

Masayasu Iguchi

Hiroyuki Morishita

Satoshi Kajita

Masahiro Ohashi

Yoshiyuki Wada

Masashi Hoshino

Masao Hamada

Masatoshi Matsuo

Takahiro Ichinomiya

Yasuo Kohashi

Koji Asai

Hiroaki Toida

Akihiko Takabatake

Yoshiharu Watanabe

Yuzi Andoh

Tetsuichi Arita

Masayoshi Toujima

Youichi Nishida

Hidekatsu Ozeki

Toshiyuki Irie

Ikuyasu Kaminaka

Keishi Chikamura

Tadashi Nasu

Takaaki Imanaka

Shun-ichi Kurohmaru

An encoder includes: circuitry; and memory, in which using the memory, the circuitry, in affine motion compensation prediction in inter prediction for a current block, places a limit on a range within which motion estimation or motion compensation is performed, and performs the motion compensation for the current block.

Encoder, decoder, encoding method, and decoding method

An encoder that; obtains two prediction images by performing motion compensation using two motion vectors; obtains a gradient value of each of pixels included in the two prediction images; derives a local motion estimation value for each of sub-blocks based on the pixel value and the gradient value of each of the pixels, the sub-blocks being obtained by partitioning the current block; and generates a final prediction image for the current block using the pixel value and the gradient value of each of the pixels, and the local motion estimation value derived for each of the sub-blocks. Each of the pixels in the two prediction images is interpolated with sub-pixel accuracy, and a reference range for the interpolation is included in a normal reference range that is referred to for motion compensation for the current block in normal inter prediction performed without using the local motion estimation value.

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

An encoder includes circuitry and memory. Using the memory, the circuitry, in inter prediction processing: derives a first motion vector of a current block to be processed, using a motion vector of a previous block which has been previously processed; derives a second motion vector of the current block by performing motion estimation in the vicinity of the first motion vector; and generates a prediction image of the current block by performing motion compensation using the second motion vector.

A decoder that decodes a current block using a motion vector includes: a processor; and memory. Using the memory, the processor: derives a first candidate vector from one or more candidate vectors of one or more neighboring blocks that neighbor the current block; determines, in a first reference picture for the current block, a first adjacent region that includes a position indicated by the first candidate vector; calculates evaluation values of a plurality of candidate regions included in the first adjacent region; and determines a first motion vector of the current block, based on a first candidate region having a smallest evaluation value among the evaluation values. The first adjacent region is included in a first motion estimation region determined based on the position indicated by the first candidate vector.

Encoder and decoder for deriving the motion vector of the current block and performing motion compensation

An encoding method is provided for encoding a picture to generate a coded stream. The encoding method incldues: generating a first prediction image of a current block included in a current picture by referring to a first region included in a reference picture different from the current picture; operating a bi-directional optical flow process to generate a second prediction image based on the first prediction image by referring to a second region included in the first region, and not operating the bi-directional optical flow process by referring to a third region not included in the first region; and encoding the current block based on the second prediction image.

An encoder includes processing circuitry and memory. Using the memory, the processing circuitry: encodes and reconstructs an image to generate a reconstructed image; determines, according to a characteristic of a block in the reconstructed image, an interpolation method for interpolating pixels located outside a referable region including the block; interpolates the pixels located outside the referable region, using the interpolation method determined; and applies a filter to the block using the pixels interpolated.

Provided is an encoder that achieves further improvement. The encoder includes processing circuitry and memory. Using the memory, the processing circuitry: obtains two prediction images from two reference pictures; derives a luminance gradient value of each pixel position in each of the two prediction images; derives a luminance local motion estimation value of each pixel position in a current block; generates a luminance final prediction image using a luminance value and the luminance gradient value in each of the two prediction images, and the luminance local motion estimation value of the current block; and generates a chrominance final prediction image using at least one of the luminance gradient value of each of the two prediction images or the luminance local motion estimation value of the current block, and chrominance of each of the two prediction images.

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Hyogo, Japan

Takashi Hashimoto