Tencent Technology (shenzhen) Company Limited

Tencent Technology Company Limited

Yingbin Wang

Shan Liu

Xiaozhong Xu

Yi Li

Ye Hu

Zhenzhong Chen

Xiao Zhong Xu

A method for determining a prediction sample of a picture block includes acquiring a type of a current pixel string where a current pixel in a current picture block is located, and determining a reference pixel value of the current pixel according to the type of the current pixel string. The method further includes obtaining a prediction sample of the current pixel according to a color sampling mode of the current picture block and the reference pixel value of the current pixel. A color sampling mode of the obtained prediction sample is consistent with the color sampling mode of the current picture block. The method further includes obtaining prediction values of the current picture block according to the prediction sample of the current pixel.

Determining prediction samples of pixels based on color sampling mode of the picture block

The embodiments of the disclosure provide an interpolation filtering method and apparatus for intra-frame prediction, a medium, and an electronic device. According to a distance between a prediction pixel and a first reference pixel, a target filter matching the distance is selected from a filter parameter corresponding to a specified prediction unit, and interpolation filtering processing is performed on a second reference pixel by using the target filter, to obtain a predicted value of the prediction pixel.

Interpolation filtering method and apparatus for intra-frame prediction, medium, and electronic device

A method for encoding a string vector includes obtaining attribute information of a pixel string in an image frame, the attribute information comprising at least one of position information of the pixel string within the image frame or a length of the pixel string. The method further includes encoding information indicating a first string vector of the pixel string based on the attribute information of the pixel string to obtain a bitstream.

Coding a pixel string vector based on attribute information of the pixel string

The present disclosure provides a video decoding method. The method includes obtaining a bitstream that needs to be decoded, the bitstream that needs to be decoded comprising a current decoding block, the current decoding block using an intra string copy mode, and the current decoding block comprising a current string; determining a string length encoding resolution of the current string; decoding the bitstream that needs to be decoded to obtain an encoded string length corresponding to the current string; and obtaining a string length of the current string according to the string length encoding resolution of the current string and the corresponding encoded string length. The string length encoding resolution of the current string is at least one of the following: at least one preset value, each preset value being an integer pixel greater than or equal to 1, or a width or a height of the current decoding block.

Video decoding method, video encoding method, electronic device, and storage medium

This application relates to the field of video coding and decoding technologies, and provides a video decoding method and apparatus, a video coding method and apparatus, a device, and a storage medium. The method includes decoding, from a bit stream, a binary symbol string with string length information of a current string, the string length information comprising information related to a string length of the current string; inversely binarizing the binary symbol string according to a string length resolution (SLR) of the current string, to obtain the string length information; and determining the string length of the current string according to the string length information.

Video decoding method and apparatus, video coding method and apparatus, device, and storage medium

A video decoding method and apparatus, a video encoding method and apparatus, a computer device, and a storage medium, which belong to the field of video processing. The video decoding method includes: performing classification on a displacement vector of a decoded block in a historical motion information list according to a following classification method, the classification method comprising: in a case that the decoded block satisfies a classification condition of any class of a plurality of classes, adding the displacement vector of the decoded block to the class, and stopping performing classification on the displacement vector of the decoded block.

Video decoding method and apparatus, video encoding method and apparatus, and device and storage medium

A video decoding method, a video encoding method, related devices, and a storage medium are provided. The video decoding method includes: determining a current string to be decoded from a current coding unit of a current image; based on the current string being a unit vector string and the current string including a first pixel, determining a reference pixel of the first pixel from a historical decoding unit in the current image, the historical decoding unit being a decoded coding unit adjacent to the current coding unit in the current image, the reference pixel of the first pixel being adjacent to the first pixel in the current image; and acquiring a predicted value of the first pixel based on a reconstructed value of the reference pixel of the first pixel to obtain a decoded image.

Video decoding method, video encoding method, related devices, and storage medium

An image processing method includes acquiring coordinates of a pixel in a first image block, the first image block being an image block in an equirectangular projection (ERP) format corresponding to an image block in a panoramic image. The coordinates include a latitude of the panoramic image. The method further includes, when the latitude included in the coordinates is less than a first threshold or greater than a second threshold, deleting one or more angle prediction modes from a current intra prediction mode set to obtain a first intra prediction mode set. The method further includes determining a target intra prediction mode of the first image block according to the first intra prediction mode set, and performing intra prediction on the first image block using the target intra prediction mode to obtain prediction information of the first image block.

Modifying a set of angle prediction modes for coding an equirectangular projection format image

This application provides a method and an apparatus for constructing a motion information list in video encoding and decoding and a device, which relates to the field of video encoding and decoding technologies. The method includes: constructing a space domain motion information list, the space domain motion information list including motion information of a space domain neighboring block of a current block, and the space domain neighboring block including at least an intra string copy (ISC) block; and obtaining at least one piece of motion information from the space domain motion information list when motion information in a candidate motion information list is insufficient, and filling the candidate motion information list using the at least one piece of motion information. According to this application, by filling the candidate motion information list using the space domain adjacent motion information when the motion information included in the candidate motion information list is insufficient, content of the candidate motion information list is expanded, so that more displacement vectors that are more effective are provided in the candidate motion information list to achieve a better displacement vector prediction effect, thereby improving the video compression performance.

Method and apparatus for constructing motion information list in video encoding and decoding and device

A video decoding and encoding method and apparatus, a computer-readable medium, and an electronic device. The video decoding method includes classifying decoded blocks adjacent to a target block according to information about the decoded blocks to obtain at least one category, obtaining a category identifier corresponding to the target block based on coding information corresponding to the target block, determining a target category corresponding to the target block from the at least one category according to the category identifier corresponding to the target block, determining a predictive vector of the target block based on vectors of decoded blocks included in the target category, and decoding the target block based on the predictive vector.

Video decoding and encoding method and apparatus, computer-readable storage medium and electronic device

This application provides a method for decoding an unmatched pixel performed by an electronic device. The method includes: obtaining a bit stream of a target video sequence and decoding the bit stream of the target video sequence by at least two entropy decoding methods, to obtain a binary symbol string of an unmatched pixel in a target picture block, the target picture block being obtained by dividing a target picture frame in the target video sequence; inversely binarizing the binary symbol string, to obtain a component value of the unmatched pixel; and obtaining the target picture block based on the component value of the unmatched pixel. This method can improve the flexibility of coding and facilitate equalization between the coding performance and the coding overhead of the unmatched pixel.

Decoding method and coding method for unmatched pixel, decoder, and encoder

This application provides a displacement vector prediction method and apparatus in video encoding/decoding and a device and relates to the field of video codec technologies. In this application, candidate displacement vectors are constructed by combining displacement vectors related to a plurality of prediction modes, and then a predicted displacement vector of a current unit is derived from the candidate displacement vectors. Information about an encoded/decoded unit having a same prediction mode as the current unit can be used and information about an encoded/decoded unit having different prediction modes from the current unit is also allowed to be combined to derive the predicted displacement vector of the current unit, so that the candidate displacement vector has a higher possibility to be selected as the predicted displacement vector, thereby improving the encoding performance of the displacement vector.

Displacement vector prediction method and apparatus in video encoding and decoding and device

This application provides a method for constructing a motion information list in video encoding and decoding performed by a computer device. The method includes: obtaining a motion information list, which is a candidate motion information list is used for providing a candidate prediction displacement vector; determining at least one piece of motion information when a length of the motion information list meets a condition; and adding the at least one piece of motion information to the candidate motion information list to obtain an updated motion information list when a length of the candidate motion information list is less than a threshold. According to the embodiments of this application, by filling a motion information list using extra motion information when motion information included in the motion information list is insufficient, more effective displacement vectors are provided in the motion information list to achieve a better displacement vector prediction effect.

Video coding/decoding can improve the uniformity of pixel strings and provide for increased coding and decoding efficiency. String length information of a current string from a bit stream is decoded. Based on the string length information and a determined string length resolution (SLR) of the current string a string length of the current string is determined. By using the SLR as a basis for dividing and decoding the pixel string, the length of the pixel string in a coding block can be limited to a multiple of the SLR, which improves uniformity of pixel strings, so that a decoder end can perform decoding with memory alignment, thereby improving decoding efficiency of the pixel strings.

The present disclosure provides a video encoding method, a video decoding method, and a related device. The method includes: obtaining a bit stream of a current image, the bit stream comprising at least one largest coding unit (LCU) comprising a current LCU and an encoded LCU, the current LCU comprising a current decoding block comprising a current string; storing pixels in the current decoding block by using a first part of a storage space with a size of M*W, and storing at least some decoded blocks in the encoded LCU and the current LCU by using a second part of the storage space, M and W being positive integers, and M≥W; and searching the second part of the storage space for a reference string for the current string, obtaining a predicted value for the current string according to the reference string, and decoding the current string.

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Shenzhen, China

Yingbin Wang