Abstract: Systems, methods, and instrumentalities are disclosed for performing video coding using adaptive motion vector resolution (AMVR) interactions with filtered prediction. Motion accuracy may be adapted when prediction filtering is used. AMVR and prediction filtering may be adapted based on their interaction. Adaptive motion vector resolution (AMVR) may be determined to be enabled for a video block. AMVR precision may be determined to be associated with the video block based at least in part on a prediction filtering enablement status for the video block. The video block may be decoded based on the determination. Based on prediction filtering being enabled for the video block, an AMVR precision indication may be determined to be skipped in video data for the video block. Based on prediction filtering being enabled for the video block, AMVR precision for the video block may be a predetermined value.

Abstract: A video decoding device may determine that a current block is coded in a non-directional intra prediction mode (e.g., an inter prediction mode, a cross component prediction mode, a palette mode, an intra block copy (IBC) mode, or an intra template matching prediction (IntraTMP) mode). The device may derive a directional intra prediction mode that corresponds to the non-directional intra prediction mode. The derived directional intra prediction mode may indicate a derived intra prediction direction. The device may decode the current block based at least in part on the derived directional intra prediction mode.

Abstract: Bi-prediction with un-equal weights varying spatially over a current block is achieved with weights which can be derived using a regression-based model computed with at least one template made of neighboring reconstructed samples. The bi-prediction can be used with geometric partition mode blocks with different motion vectors per sub-block. The regression aims at minimizing a distance between reconstructed samples of the template and prediction samples of the template derived from two uni-prediction templates.

Abstract: A prediction method is disclosed. A block vector is first obtained for a current picture block. It is then determined whether a reference block identified by the block vector is at least partly inside an authorized area, wherein the authorized area is a picture area already processed. The block vector may then be modified responsive to the determining so that the reference block identified by the modified block vector is located at least partly in the authorized area. Finally, the current picture block is predicted from a reference block identified by the modified block vector.

Abstract: Different quantization matrices may be transmitted corresponding to different block sizes, color components and prediction modes. To more efficiently signal the coefficients of the quantization matrices, in one implementation, a unified matrix identifier matrixId is used, based on a size identifier (sizeId) that relates to CU size with larger sizes listed first, and a matrix type (matrixTypeId) with luma QMs listed first. For example, the unified identifier is derived as: matrixId=N*sizeId+matrixTypeId, where N is the number of possible type identifiers, e.g., N=6. This single identifier allows referring to any previously transmitted matrix when using prediction (copy), and transmitting larger matrices first avoids interpolation in the prediction process. When a block uses the Intra Block Copy prediction mode, QM identifier may be derived as if the block uses the INTER prediction mode.

Abstract: A method and an apparatus for encoding or decoding a video are provided. A luma component of a block of the video is reconstructed. The video block being coded in an inter coding mode, a cross-component prediction mode for the video block is determined and one or more syntax elements are encoded for the video block, the one or more syntax elements providing for deriving the cross-component prediction mode on the decoder side from among a set of cross-component prediction modes. The chroma component of the video block is encoded based on the reconstructed luma component and the determined cross-component prediction mode.

Abstract: Methods and apparatuses for video coding are provided where a block is predicted using a combination of two intra prediction modes. A first prediction is generated from a non-directional mode, such as a Planar, Matrix-based Intra Prediction (MIP), or Intra Block Copy (IBC) mode. A second prediction is generated from a directional mode, which may be derived at a decoder from reconstructed neighboring samples without being explicitly signaled, reducing signaling overhead. A final prediction for the block is formed by combining the first and second predictions, for example, through a weighted average. This technique applies to both encoding and decoding processes.

Abstract: In at least one embodiment, a method and apparatus for encoding/decoding a video is based on a CABAC coding of bins where a high-level constraint on the maximum usage of regular CABAC coding of bins is enforced. In other words, a budget of regular coded bins is allocated over a picture area that is larger than a coding group, thus covering a plurality of coding groups, and which is determined from an average allowed number of regular bins per unit of area.

Abstract: Systems, methods, and instrumentalities are disclosed for performing video coding using residual coefficient sign prediction with an adaptive cost function for intra prediction modes. An adaptive cost function for intra prediction modes (IPMs) may include multiple (e.g., selectable) cost functions, such as a default or standard cost function, a horizontal cost function, a vertical cost function, a diagonal up-right cost function, a diagonal down-right cost function, and/or a diagonal down-left cost function. A cost function may be selected based on one or more rules, which may be based on an IPM and a corresponding IPM index. An adaptive cost function for IPMs may include a cost function for multiple (e.g., all) directions. A cost function for multiple directions may include weighting factors related to an IPM and corresponding IPM index. A weighting parameter between the top and the left border continuity cost may be deduced from the IPM index.

Abstract: A method and an apparatus for encoding or decoding a video are provided. A predictor block for a video block is obtained based on an angular intra prediction mode that uses at least one primary reference sample. The predictor block is modified using a position dependent pixel combination that uses for at least one pixel, a weighted combination of values determined from at least two secondary reference samples. The video block is encoded or decoded based at least on the modified predictor block.

Abstract: In one implementation, we propose to improve the PLANAR and DC prediction modes by introducing weights, for example, proportional to the sides of the block. The planar mode prediction is obtained by a weighted combination of the horizontal and vertical interpolations. Similarly, the DC value in the DC prediction mode is obtained as a weighted combination of the DC values computed from the top and the left reference arrays of a target block. When the target block is flat because of a high width to height ratio, or tall because of a high height to width ratio, the proposed methods are expected to produce better predictions than the equal weighted versions.

Abstract: Coding of a geometric prediction mode with template matching is accomplished with embodiments that improve coding and decoding. In one embodiment, an intra mode index and a split mode are jointly coded, allowing for sorting a uniquely generated index and coding the indices with smaller cost on shorter code lengths. In another embodiment, sorting of intra prediction modes of allowed intra geometric partitioning modes is based on template matching cost so that cheapest mode is coded with fewer bits.

Abstract: In one implementation, the simple addition of the prediction sample block (Pred(p)) and the decoded residual sample block (Res p) in the reconstruction process is replaced by a blending process. The blending process can be considered as a function f(Pred(p), Res p) involving more complex operations than a simple addition. For example, the decoded prediction residuals (Resp) can be scaled by a scaling factor and/or shifted by an offset in the blending process. The prediction samples (Pred(p)) may also be scaled in the blending process. At the encoder side, the blending parameter(s) for a block may be selected by minimizing a loss function. At the decoder side, a set of blending parameters may be predefined or decoded, and a particular blending parameter can be selected by the decoder based on the prediction sample value, quantization parameter (QP) for the block or an index signaled for the current block.

Abstract: Intra sub-block partitioning (ISP) is changed to improve coding in certain instances. In one embodiment, when the ISP direction and Intra Prediction Mode (IPM) are both oriented in one direction, it is proposed to change the splitting for the sub-partitions. Depending on the embodiment, the IPMs considered vertical can be all IPMs with index greater than value (34), or the IPMs considered vertical could be only IPMs with an index value greater than (50) to only account for modes that only use the above reference samples. In another embodiment, sub-partitions could have an additional split in either direction.

Abstract: Systems, methods, and instrumentalities are configured for usage of template based intra prediction mode (TIMD) and decoder side intra mode derivation (DIMD). A device, (e.g., a video encoding device and/or video encoding device) may determine that a reference block of a video block is coded using an intra prediction mode. The device may, based on the determination that the reference block of the video block is coded using the intra prediction mode, determine a prediction block of the video block using a plurality of intra prediction modes associated with the reference block. The device may process (e.g., encode and/or decode) the video block based on the determined prediction block.

Abstract: Systems, devices, and methods are described herein for generating and reordering of a most probable mode list for intra prediction. For example, a device for video decoding and/or video encoding may determine an intra prediction mode associated with a neighboring block, e.g., based on a template-based intra mode derivation (TIMD) and/or a decoder side intra mode derivation (DIMD). The device may determine whether the intra prediction mode associated with the neighboring block is the same as a candidate mode on a most probable mode (MPM) list. Based on a determination that the intra prediction mode is the same as the candidate mode, the device may adjust a weight associated with the candidate mode. Based on the adjusted weight associated with the candidate mode, the device may reorder the MPM list based. The device may encode/decode the current block based on the MPM list.

Abstract: Systems, methods, and instrumentalities are disclosed for most probable mode (MPM) list generation with template-based intra mode derivation (TIMD). An example method involves determining an intra coding mode derivation process is enabled for a first coding block; based on the intra coding mode derivation process being enabled for the first coding block, generating a first MPM list for the first coding block based on a first MPM list generation process; decoding the first coding block based on the first MPM list; determining that the intra coding mode derivation process is disabled for a second coding block; based on the intra coding mode derivation process being disabled for the second coding block, generating a second MPM list for the second coding block based on a second MPM list generation process, different from the first MPM list generation process; and decoding the second coding block based on the second MPM list.

Abstract: The present application relates to the technical field of audio device, and in particular discloses a speaker assembly, a microphone and a smart portable karaoke system. The speaker assembly includes an accommodating groove for storing a microphone. When the microphone is in the accommodating groove, the microphone has two states: a sunken state, in which the microphone is configured to slide downwards with respect to the accommodating groove and is locked in the accommodating groove when being pushed for the first time; and a lifted state, in which the microphone is released and is configured to slide upwards with respect to the accommodating groove when being pushed again. The speaker assembly provided by the present application can effectively solve the problem that the microphone is inconvenient to carry and accommodate.

Abstract: Systems, methods, and instrumentalities are disclosed for performing planar horizontal mode, planar vertical mode, and/or planar directional mode intra-prediction. Planar intra-prediction modes may be used in video coding for coding blocks. Directionality of planar intra-prediction modes may be used to determine a reference region and/or template. For example, a cross-component linear model (CCLM) or a multi-model linear model mode may be determined based on the direction of the planar mode. A reference region of chroma decoder-side intra mode derivation (DIMD) or convolutional cross-component model (CCCM) for a chroma block may be determined based on a planar mode associated with a collocated luma block. For example, a reference region or template for template-based intra mode derivation (TIMD) or spatial geometric partitioning mode (SGPM) may be determined based on the direction of the planar mode.