Abstract: A method for decoding video data. The method includes obtaining a video block from a bitstream; determining a region to derive a multiple linear regression (MLR) model; obtaining luma and chroma sample values in the region; deriving the MLR model using the luma and chroma sample values in the region; predicting each of chroma samples in the video block by applying the MLR model to corresponding luma samples for that chroma sample; and obtaining decoded video block using the predicted chroma samples.

Abstract: A method for video decoding, a computing device, and a non-transitory computer readable storage medium are provided. The method includes receiving, by a decoder, three control flags in a sequence parameter set (SPS); receiving, by the decoder, a first presence flag in the SPS when the first control flag is true, a second presence flag in the SPS when the second control flag is true and a third presence flag in the SPS when the third control flag is true; receiving, by the decoder, a first/second/third picture control flag in a picture header of each picture that refers to the SPS when the first/second/third presence flag in the SPS is true.

Abstract: A method for video coding is provided. The method includes: setting, by an encoder, a first syntax element in a picture parameter set (PPS) specifying whether a picture corresponding to the PPS comprises more than one network abstraction layer (NAL) units and whether the more than one NAL units have a same NAL unit type; setting, by the encoder, a second syntax element in a picture header (PH) specifying whether the picture corresponding to the PH is an intra random access point (IRAP) picture or a gradual decoding refresh (GDR) picture, wherein a value of the first syntax element is set based on a value of the second syntax element being 1; and forming, by the encoder, a bitstream with the first syntax element and the second syntax element.

Abstract: The invention discloses an environmentally friendly impregnation system for fiber surface treatment and a preparation method thereof, and an impregnation treatment method. The environmentally friendly impregnation system for fiber surface treatment of the invention includes hydroxyacrylic resin, amino resin, epoxy resin, blocked isocyanate, accelerator, rubber latex, and deionized water. Depending on the type of fiber and its application, the invention allows for the selection of one-step impregnation treatment or two-step impregnation treatment. The invention can effectively replace the use of toxic raw materials and intermediates in traditional RFL impregnation system, reducing harm to human health and the environment while achieving the adhesion level of RFL treatment.

Abstract: The present disclosure relates to image processing methods and apparatus. One example image processing method includes obtaining a face image, separately obtaining a left face image and a right face image based on the face image, inputting the left face image into a first target key point convolutional neural network model, outputting coordinates of a first left face key point, inputting the right face image into a second target key point convolutional neural network model, outputting coordinates of a first right face key point, and obtaining coordinates of a face key point of the face image based on the coordinates of the first left face key point and the coordinates of the first right face key point.

Abstract: An electronic apparatus performs a method of decoding video data, including receiving, from bitstream, a first syntax element in a slice header of a slice that indicates whether luma mapping with chroma scaling (LMCS) is applied to a coding unit in the slice; receiving a second syntax element for the coding unit that indicates whether the coding unit has been coded using adaptive color-space transform (ACT); if the second syntax element has a non-zero value, decoding the coding unit by applying inverse ACT to convert luma and chroma residuals of the coding unit from a transformed color space to an original color space of the video data; and if the first syntax element has a non-zero value, decoding the coding unit by performing inverse luma mapping to the luma samples and inverse scaling to the chroma residuals of the coding unit after performing the inverse ACT.

Abstract: An electronic apparatus performs a method of coding video data. The method comprises: receiving, from the bitstream, syntax elements associated with a coding unit, wherein the syntax elements include a first coded block flag (CBF) for residual samples of a first chroma component, a second CBF for residual samples of a second chroma component, and a third syntax element indicating whether adaptive color transform (ACT) is applied to the coding unit; determining whether to perform the chroma residual scaling to the residual samples of the chroma components according to the first CBF, the second CBF, and the third syntax element; in accordance with a determination to perform the chroma residual scaling to the residual samples of the first and second chroma components, scaling the residual samples of the at least one of the first and second chroma components based on a corresponding scaling parameter.

Abstract: A method for video encoding, a comuting device, and a non-transitory computer readable storage medium are provided. The method includes transmitting, by an encoder, a first control flag in a sequence parameter set (SPS), a second control flag in the SPS, and a third control flag in the SPS; transmitting, by the encoder, a first presence flag in the SPS when the first control flag is true, a second presence flag in the SPS when the second control flag is true and a third presence flag in the SPS when the third control flag is true; transmitting, by the encoder, a first/second/third picture control flag in a picture header of each picture that refers to the SPS when the first/second/third presence flag in the SPS is true.

Abstract: A method for video encoding is provided. The method includes determining, by an encoder, a reference picture associated with a video block; determining, by the encoder, initial prediction samples of the video block from the reference picture; deriving, by the encoder, internal prediction refinement with optical flow (PROF) parameters of a PROF derivation process by applying right-shifting operations, wherein the internal PROF parameters comprise horizontal gradient values, vertical gradient values, horizontal motion difference values, and vertical motion difference values derived for samples in the video block; determining, by the encoder, prediction refinement values for the samples in the video block based on the horizontal gradient values, the vertical gradient values, the horizontal motion difference values, and the vertical motion difference values; and determining, by the encoder, refined prediction samples of the video block based on the initial prediction samples and the prediction refinement values.

Abstract: An electronic apparatus performs a method of coding video data. The method comprises: receiving, from the bitstream, syntax elements associated with a coding unit, wherein the syntax elements include a first coded block flag (CBF) for residual samples of a first chroma component, a second CBF for residual samples of a second chroma component, and a third syntax element indicating whether adaptive color transform (ACT) is applied to the coding unit; determining whether to perform the chroma residual scaling to the residual samples of the chroma components according to the first CBF, the second CBF, and the third syntax element; in accordance with a determination to perform the chroma residual scaling to the residual samples of the first and second chroma components, scaling the residual samples of the at least one of the first and second chroma components based on a corresponding scaling parameter.

Abstract: An electronic apparatus performs a method of coding video data. The method comprises: receiving, from the bitstream, syntax elements associated with a coding unit, wherein the syntax elements include a first coded block flag (CBF) for residual samples of a first chroma component, a second CBF for residual samples of a second chroma component, and a third syntax element indicating whether adaptive color transform (ACT) is applied to the coding unit; determining whether to perform the chroma residual scaling to the residual samples of the chroma components according to the first CBF, the second CBF, and the third syntax element; in accordance with a determination to perform the chroma residual scaling to the residual samples of the first and second chroma components, scaling the residual samples of the at least one of the first and second chroma components based on a corresponding scaling parameter.

Abstract: An electronic apparatus performs a method of decoding video data, comprising: receiving, from bitstream, a first syntax element in a slice header of a slice that indicates whether luma mapping with chroma scaling (LMCS) is applied to a coding unit in the slice; receiving a second syntax element for the coding unit that indicates whether the coding unit has been coded using adaptive color-space transform (ACT); if the second syntax element has a non-zero value, decoding the coding unit by applying inverse ACT to convert luma and chroma residuals of the coding unit from a transformed color space to an original color space of the video data; and if the first syntax element has a non-zero value, decoding the coding unit by performing inverse luma mapping to the luma samples and inverse scaling to the chroma residuals of the coding unit after performing the inverse ACT.

Abstract: An electronic apparatus performs a method of decoding video data, including receiving, from bitstream, a first syntax element in a slice header of a slice that indicates whether luma mapping with chroma scaling (LMCS) is applied to a coding unit in the slice; receiving a second syntax element for the coding unit that indicates whether the coding unit has been coded using adaptive color-space transform (ACT); if the second syntax element has a non-zero value, decoding the coding unit by applying inverse ACT to convert luma and chroma residuals of the coding unit from a transformed color space to an original color space of the video data; and if the first syntax element has a non-zero value, decoding the coding unit by performing inverse luma mapping to the luma samples and inverse scaling to the chroma residuals of the coding unit after performing the inverse ACT.

Abstract: Methods, apparatuses, and non-transitory computer-readable storage mediums are provided for video decoding. The method includes dividing a video block to multiple non-overlapped video subblocks, dividing a video block to multiple non-overlapped video subblocks, obtaining a first reference picture I(0) and a second reference picture I(1), obtaining first prediction samples I(0)(i,j)'s, obtaining second prediction samples I(1)(i,j)'s, obtaining horizontal and vertical gradient values of the first prediction samples I(0)(i,j)'s and second prediction samples I(1)(i,j)'s, obtaining motion refinements for samples in the video subblock based on the BDOF when the video block is not coded in affine mode, obtaining motion refinements for samples in the video subblock based on the PROF when the video block is coded in affine mode, and obtaining prediction samples of the video block based on the motion refinements.

Abstract: Methods for video decoding and encoding, apparatuses and non-transitory storage media are provided. In one decoding method, the decoder obtains a first candidate position and a second candidate position. The decoder obtains a third candidate position based on the first and second candidate positions and obtains a virtual block based on the first, the second, and the third candidate positions. The decoder may obtain a plurality of CPMVs for the virtual block based on translational MVs at the first, second, and third candidate positions; and project, the plurality of CPMVs for the virtual block to a current block to obtain a translational MV based on a specific position within the current block or a second plurality of CPMVs for the current block.

Abstract: An electronic apparatus performs a method for video decoding. The method comprises: receiving, from a bitstream, a coding unit and determining a mode type condition of the coding unit; if the coding unit is encoded in a first chroma format, setting the mode type condition of the coding unit to a first mode type condition; if the coding unit is encoded in a second chroma format and the coding unit is a smallest chroma intra prediction unit, setting the mode type condition of the coding unit to a second mode type condition if a luma block of the coding unit and the splitting method satisfy a first criterion; setting the mode type condition of the coding unit to a third mode type condition if the luma block of the coding unit and the splitting method satisfy a second criterion, and decoding the coding unit based on the mode type condition.

Abstract: An electronic apparatus performs a method for video decoding. The method comprises: receiving, from a bitstream, a coding unit and determining a mode type condition of the coding unit; if the coding unit is encoded in a first chroma format, setting the mode type condition of the coding unit to a first mode type condition; if the coding unit is encoded in a second chroma format and the coding unit is a smallest chroma intra prediction unit, setting the mode type condition of the coding unit to a second mode type condition if a luma block of the coding unit and the splitting method satisfy a first criterion; setting the mode type condition of the coding unit to a third mode type condition if the luma block of the coding unit and the splitting method satisfy a second criterion, and decoding the coding unit based on the mode type condition.

Abstract: Methods, apparatuses, and non-transitory computer-readable storage mediums are provided for video coding. In one method, a decoder obtains a first signaled flag that indicates whether a template-based intra mode derivation (TIMD) mode is applied on a current video block; and in response to determining that the TIMD mode is applied on the current video block based on the first signaled flag, the decoder obtains a second signaled flag in transform block (TB), coding block (CB), slice, picture, or sequence level that indicates whether signaling of an index of a template for TIMD is enabled, where the index of the template is signaled to derive the intra prediction mode for the current video block.

Abstract: Methods for video decoding and encoding, apparatuses and non-transitory computer-readable storage media thereof are provided. In one method for video decoding, a binary arithmetic decoder may obtain, according to an adaptive weight, a multi-hypothesis probability for a binary symbol of a context model for the binary arithmetic decoder, where the multi-hypothesis probability indicates a probability of the binary symbol equaling to a binary value, and the binary symbol is from a plurality of binary symbols associated with the context model. Furthermore, the decoder may decode the binary symbol according to the multi-hypothesis probability.

Abstract: Methods, devices, and storage mediums are provided for decoding video signals. A decoder receives at least one versatile video coding (VVC) syntax flag. The decoder receives, in response to a syntax element indicating that inter prediction is allowed, inter related syntax elements. The decoder obtains a first reference picture I(0) and a second reference picture I(1) associated with a video block in a bitstream. The decoder obtains first prediction samples I(0)(i,j) of the video block from a reference block in the first reference picture I(0). The decoder obtains second prediction samples I(1)(i,j) of the video block from a reference block in the second reference picture I(1). The decoder obtains bi-prediction samples based on the at least one VVC syntax flag, the inter related syntax elements, the first prediction samples I(0)(i,j), and the second prediction samples I(1)(i,j).