A video decoding method performed by a video decoding apparatus according to the present document comprises: parsing number information about the number of slices for which height is explicitly signaled in a tile of a current picture from a bitstream; parsing height information about the height of the slices for which height is explicitly signaled from the bitstream based on the number information; and decoding the current picture based on the number information and the height information.

A video coder is configured to construct a merge candidate list of merge candidates, wherein the merge candidate list has N1 candidates, N1 being a positive integer value, reorder the merge candidates in the merge candidate list to create a reordered merge candidate list, reduce the reordered merge candidate list to create an output merge candidate list, wherein the output merge candidate list has N2 candidates, wherein N2 is less than N1, and code a block of video data using the output merge candidate list.

A video coder is configured to construct a merge candidate list of merge candidates, wherein the merge candidate list has N1 candidates, N1 being a positive integer value, reorder the merge candidates in the merge candidate list to create a reordered merge candidate list, reduce the reordered merge candidate list to create an output merge candidate list, wherein the output merge candidate list has N2 candidates, wherein N2 is less than N1, and code a block of video data using the output merge candidate list.

An image decoding method performed by a decoding apparatus according to the present disclosure includes determining whether to use an advanced temporal motion vector predictor (ATMVP) candidate of sub-block unit for a current block, specifying a corresponding block corresponding to the current block in a reference picture based on a motion vector for a spatial neighboring block of the current block when the ATMVP candidate of the sub-block unit is used, deriving the ATMVP candidate of the sub-block unit for the current block based on motion vectors of sub-block unit of the corresponding block, constructing a merge candidate list including the ATMVP candidate of the sub-block unit for the current block, generating prediction samples of the current block by deriving motion vectors of the sub-block unit for the current block based on the merge candidate list and reconstructing a current picture based on the prediction samples of the current block.

The present invention is concerned with methods, encoders, decoders and data streams for coding pictures, and in particular a consecutive sequence of pictures, Some embodiments may exploit the so-called Gradual Decoder Refresh—GDR—coding scheme for coding the pictures. Some embodiments may suggest Scalable Coding and Gradual Decoder Refresh improvements.

The present invention is concerned with methods, encoders, decoders and data streams for coding pictures, and in particular a consecutive sequence of pictures, Some embodiments may exploit the so-called Gradual Decoder Refresh—GDR—coding scheme for coding the pictures. Some embodiments may suggest Scalable Coding and Gradual Decoder Refresh improvements.

A method for decoding encoded blocks of pixels from an encoded video bit stream is provided that includes decoding a block vector corresponding to an encoded block of pixels from the encoded bit stream, verifying that the block vector indicates a block of reconstructed pixels in a search area including reconstructed pixels of a largest coding unit (LCU) including the encoded block of pixels and N left neighboring reconstructed LCUs of the LCU, and decoding the encoded block of pixels, wherein the block of reconstructed pixels is used as a predictor for the encoded block of pixels.

A method for decoding encoded blocks of pixels from an encoded video bit stream is provided that includes decoding a block vector corresponding to an encoded block of pixels from the encoded bit stream, verifying that the block vector indicates a block of reconstructed pixels in a search area including reconstructed pixels of a largest coding unit (LCU) including the encoded block of pixels and N left neighboring reconstructed LCUs of the LCU, and decoding the encoded block of pixels, wherein the block of reconstructed pixels is used as a predictor for the encoded block of pixels.

Improved video compression and video streaming systems and methods are disclosed for environments where camera motion is common, such as cameras incorporated into head-mounted displays. This is accomplished by combining a 3D representation of the shape of the user's environment (walls, floor, ceiling, furniture, etc.), image data, and data representative of changes in the location and orientation (pose) of the camera between successive image frames, thereby reducing data bandwidth needed to send streaming video in the presence of camera motion.

Improved video compression and video streaming systems and methods are disclosed for environments where camera motion is common, such as cameras incorporated into head-mounted displays. This is accomplished by combining a 3D representation of the shape of the user's environment (walls, floor, ceiling, furniture, etc.), image data, and data representative of changes in the location and orientation (pose) of the camera between successive image frames, thereby reducing data bandwidth needed to send streaming video in the presence of camera motion.