Abstract: This application discloses a video decoding method, a video encoding method and apparatus, a storage medium, an electronic device, and a program product. The video decoding method includes: obtaining a video bitstream, the video bitstream comprising decoding indication information, the decoding indication information comprising a first intra block copy parameter and a second intra block copy parameter, and the first and second intra block copy parameters being configured for providing a decoding indication on an intra block copy mode including a first sub-mode corresponding to the first intra block copy parameter and a second sub-mode corresponding to the second intra block copy parameter, respectively; and decoding the video bitstream according to the first and second intra block copy parameters.

Abstract: A video decoding method, includes: partitioning a chroma block into at least one chroma sub-block based on determining a first block vector (BV) of the chroma block is derived from a second BV of a luma block; acquiring a third BV of a first luma sub-block corresponding to the at least one chroma sub-block; mapping the third BV to a fourth BV of the at least one chroma sub-block according to a chroma scale factor of video to be decoded; and decoding the chroma block according to the fourth BV to obtain a reconstructed block corresponding to the chroma block.

Abstract: Embodiments of this application provide a video encoding/decoding method performed by an electronic device. The video decoding method includes: decoding a video code stream, to obtain mode index information for a rearranged mode list; sorting a plurality of angular weighted prediction (AWP) modes used for a current block in accordance with an ascending order of cost of the plurality of AWP modes, to obtain the rearranged mode list; selecting a corresponding AWP mode from the rearranged mode list based on the mode index information; deriving a weight matrix of the current block based on the selected AWP mode; and performing weighted prediction based on the weight matrix, to obtain a predicted value corresponding to the current block. Through technical solutions in the embodiments of this application, encoding bit overheads of AWP mode index information can be effectively reduced, helping improve encoding and decoding performance.

Abstract: Intra block copy prediction is performed on a current block according to a reference block of the current block to obtain a first predicted value of the current block in a current video frame. A first template region of the reference block and a second template region of the current block are determined. The first template region includes one or more reconstructed image regions adjacent to the reference block, and the second template region includes one or more reconstructed image regions adjacent to the current block. A filter is determined according to the first template region and the second template region. Filtering processing is performed on the first predicted value of the current block according to the filter to obtain a second predicted value of the current block. The current block is reconstructed based on a weighted combination of the first predicted value and the second predicted value.

Abstract: This application relates to the field of video encoding and decoding technologies, and provides a video decoding method, a video encoding method, a decoder, an encoder, an electronic device, and a computer-readable storage medium. The decoding method includes: parsing a code stream to determine a target block, in accordance with a determination that a prediction mode of the target block is intra block copy (IBC) prediction; determining target prediction information of the target block based on reconstruction information of an adjacent region of the target block and original prediction information of the target block; and determining reconstruction information of the target block based on the target prediction information. According to the solution of this application, reconstruction information of a surrounding region of the target block is added to the target prediction information, which facilitates smooth transition between the target block and the surrounding region thereof.

Abstract: In a video decoding method, coding information of a to-be-decoded region is obtained from a bitstream, the coding information indicating at least one of a prediction mode, an interpolation direction, a coding component, or an interpolation target. In the method, a target interpolation filter corresponding to the to-be-decoded region is determined from a plurality of candidate interpolation filters based on the coding information, the plurality of candidate interpolation filters having different filter taps. In the method, a predicted value of the to-be-decoded region is determined through application of the target interpolation filter on a reference region.

Abstract: 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.

Abstract: Aspects of this disclosure provide a video decoding method and a video encoding method. In a video decoding method, a coded bitstream of a video is obtained. The coded bitstream includes transform mode syntax control information of a secondary transform mode. The secondary transform mode is determined from a plurality of secondary transform modes based on the transform mode syntax control information. A current block of a current picture of the video is decoded with the secondary transform mode that is determined based on the transform mode syntax control information. The transform mode syntax control information indicates which of the plurality of secondary transform modes is enabled for the current block. Apparatus and non-transitory computer-readable storage medium counterpart embodiments are also contemplated.

Abstract: A video processing method, performed by a computer device, includes: performing compound prediction on a current block to be decoded in a video bitstream; determining, for the current block based on significance of one or more first reference predicted values derived from one or more reference blocks of the current block, a target weight group including one or more first weight values, and the significance indicating a degree of impact of a corresponding reference predicted value on decoding performance for the current block; performing weighted prediction on the one or more first reference predicted values based on the one or more first weight values obtain a predicted value of the current block; and reconstructing a decoded image corresponding to the current block based on the predicted value, wherein the one or more first reference predicted values are in a one-to-one correspondence with the one or more reference blocks.

Abstract: Embodiments of this disclosure disclose a multimedia data processing method, apparatus, device, computer-readable storage medium, and computer program product. The method includes: acquiring attribute information of a to-be-encoded data block in a multimedia data frame; acquiring a first target reference data block matching the attribute information of the to-be-encoded data block, the first target reference data block being selected from a first reference data block set, a second reference data block set, or a third reference data block set integrating the first reference data block set and the second reference data block set; and performing predictive coding on the to-be-encoded data block according to the first target reference data block.

Abstract: A coding block processing method includes receiving a bit stream, and determining, according to the bit stream, that a current coding block is coded in intra block copy mode, and that the current coding block overlaps a reference coding block. The method further includes, in response to the determination that the current coding block overlaps the reference coding block, determining that the current coding block is a merged block and partitioning the merged block into plural sub-blocks. The method further includes determining motion information of the plural sub-blocks based on one set of motion information indicated in the bit stream, such that the plural subblocks have the same motion information.

Abstract: This application provides a video decoding method performed by an electronic device. The method includes: decoding a video bitstream to obtain bitstream information; determining a reference weight derivation function used by a coded block according to the bitstream information; calculating a reference weight corresponding to the coded block according to the reference weight derivation function; determining, according to the reference weight, a weight matrix corresponding to the coded block; and performing weighted prediction according to the weight matrix, to obtain a predicted value corresponding to the coded block. The technical solutions in the embodiments of this application are provided, whereby a reference weight derivation function may be adaptively selected for a coding block and indicated by bitstream information. Therefore, a more accurate weight matrix may be derived for different coding blocks, to help improve encoding/decoding performance.

Abstract: Example embodiments provide a multimedia data processing method and apparatus, a computer device, a computer-readable storage medium, and a computer program product. The method includes: obtaining a global reference data block set and a local reference data block set, the global reference data block set and the local reference data block set being associated with a first data block in a multimedia data frame, the global reference data block set including a coded data block having no adjacent relationship with the first data block in the multimedia data frame, and the local reference data block set including a coded data block having an adjacent relationship with the first data block in the multimedia data frame; and determining a reference data block for coding or decoding of the first data block from the global reference data block set and the local reference data block set.

Abstract: Embodiments of this disclosure disclose a multimedia data processing method, apparatus, device, computer-readable storage medium, and computer program product. The method includes: acquiring attribute information of a to-be-decoded data block in a multimedia data frame; acquiring a first target reference data block matching the attribute information of the to-be-decoded data block from one of: a first reference data block set, a second reference data block set, or a third reference data block set integrating the first reference data block set and the second reference data block set, the first reference data block set comprising decoded data blocks not having a neighbor relationship with the to-be-decoded data block, and the second reference data block set comprising decoded data blocks having a neighbor relationship with the to-be-decoded data block; and decoding the to-be-decoded data block according to the first target reference data block.

Abstract: Some aspects of the disclosure provide a method for picture block prediction. For example, a type of a current pixel string where a current pixel in a current picture block is located is acquired. A reference pixel for the current pixel is determined according to the type of the current pixel string. A prediction sample of the current pixel is obtained according to a color sampling mode of the current picture block and the reference pixel. When position information of the prediction sample satisfies a sampling requirement according to a color sampling ratio associated with the color sampling mode, the prediction sample includes a chroma prediction sample that is obtained based on the reference pixel. Prediction values of the current picture block are obtained according to the prediction sample of the current pixel.

Abstract: Some aspects of the disclosure provide a method of video processing. In some examples, a current chrominance block in a current picture carried in a video bitstream being coded in a chrominance block copy intra prediction mode is determined. The chrominance block copy intra prediction mode can predict at least a value of the current chrominance block based on a displacement vector. A target displacement vector of a co-located luminance block of the current chrominance block is obtained. The target displacement vector is selected from a plurality of candidate displacement vectors associated with the co-located luminance block of the current chrominance block. At least a predicted value of the current chrominance block is determined based on the target displacement vector. The current picture that includes the current chrominance block is reconstructed based on at least the predicted value. Apparatus and non-transitory computer-readable storage medium counterpart embodiments are also contemplated.

Abstract: The present disclosure provides a video decoding method performed by an electronic device. The method includes: decoding a bitstream to obtain a first flag, a first index value, and a second index value; determining a target intra prediction mode in a first intra prediction mode list according to the first index value and a target weighting list in a weighting list set according to the second index value when the first flag satisfying a first preset condition; determining reference samples of a first category and reference samples of a second category according to reference samples corresponding to the current block, and weighting the reference samples of the first category and the reference samples of the second category based on the target weighting list to obtain weighted reference samples; and predicting samples the in the current block according to the weighted reference samples and the target intra prediction mode.

Abstract: Example embodiments provide a multimedia data processing method and apparatus, a computer device, a computer-readable storage medium, and a computer program product. The method includes: obtaining a global reference data block set and a local reference data block set, the global reference data block set and the local reference data block set being associated with a first data block in a multimedia data frame, the global reference data block set including a coded data block having no adjacent relationship with the first data block in the multimedia data frame, and the local reference data block set including a coded data block having an adjacent relationship with the first data block in the multimedia data frame; and determining a reference data block for coding or decoding of the first data block from the global reference data block set and the local reference data block set.

Abstract: 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.

Abstract: 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.