A decoder includes circuitry configured to receive a bitstream, identify, as a function of the bitstream, a current frame, and a cropped sub-frame of the current frame, wherein the cropped sub-frame is signaled in the bitstream, the cropped sub-frame is signaled using at least a vertical offset, and the at least a vertical offset includes an sps_conf_win_top_offset and an sps_conf_win_bottom offset, determine, as a function of the bitstream, a scaling constant associated with the cropped sub-frame, and reconstruct pixel data of the cropped sub-frame using the scaling constant.

A decoder includes circuitry configured to receive a bitstream, identify, as a function of the bitstream, a current frame, and a cropped sub-frame of the current frame, wherein the cropped sub-frame is signaled in the bitstream, the cropped sub-frame is signaled using at least a horizontal offset, the at least a horizontal offset includes an sps_conf_win_left_offset and an sps_conf_win_right_offset, determine, as a function of the bitstream, a scaling constant associated with the cropped sub-frame, wherein the scaling constant is signaled within the bit stream, and the scaling constant is signaled as a function of a pps_pic_width_in_luma_samples parameter, a pps_scaling_win_right_offset parameter, and a pps_scaling_win_left_offset parameter, and reconstruct pixel data of the cropped sub-frame using the scaling constant.

An encoder includes circuitry configured to receive a video including a current frame, select a cropped sub-frame of the current frame, signal in a bitstream the cropped sub-frame of the current frame as a function of the initial block segment, wherein the cropped sub-frame is signaled using at least a vertical offset and at least a horizontal offset, the at least a vertical offset includes an sps_conf_win_top_offset and an sps_conf_win_bottom offset, the at least a horizontal offset includes an sps_conf_win_left_offset and an sps_conf_win_right_offset, and signal in the bitstream a scaling constant associated with the cropped sub-frame.

The present disclosure relates to deblocking filtering, which may be advantageously applied for block-wise encoding and decoding of images or video signals. In particular, the present disclosure relates to an improved memory management in an automated decision on whether to apply or skip deblocking filtering for a block and to selection of the deblocking filter. The decision is performed on the basis of a segmentation of blocks in such a manner that memory usage is optimized. Preferably, the selection of appropriate deblocking filters is improved so as to reduce computational expense.

An asymmetric deblocking method for deblocking a boundary between a P block and a Q block such that 5 samples within the P block and 7 or 3 samples within the Q block are modified. The method includes determining a value refP based on at least p5, determining a value refQ based on at least qx, wherein qx is q3 or q7; determining a value refMiddle based on at least p0 and q0, wherein p0 is directly adjacent to the boundary and q0 is directly adjacent to the boundary; performing a linear interpolation between refP and refMiddle; and performing a linear interpolation between refQ and refMiddle.

A decoder includes circuitry configured to receive a bit stream, identify, as a function of the bitstream, a current frame, and a cropped sub-frame of the current frame, determine, as a function of the bitstream, a scaling constant associated with the cropped sub-frame, and reconstruct pixel data of the cropped sub-frame using the scaling constant.

A decoder includes circuitry configured to receive a bit stream, identify, as a function of the bitstream, a current frame, and a cropped sub-frame of the current frame, determine, as a function of the bitstream, a scaling constant associated with the cropped sub-frame, and reconstruct pixel data of the cropped sub-frame using the scaling constant.

Techniques for coding and decoding video may include predicting picture regions defined by a time-varying tessellation and/or by a tessellation that varies spatially within a picture. These techniques improve decoded video quality, for example, by reducing block-based visual artifacts. Tessellation patterns may be irregular spatially to prevent alignment of some prediction region boundaries within a picture. Tessellation patterns may vary over time based on a spatial offset value, and the spatial offset value may be determined via a modulo function. Tessellation patterns may include overlapped shapes, for example when used in conjunction with overlapped block motion compensation.

When removing a block distortion occurring in a local decoded image, a loop filtering part 11 of an image coding device carries out a filtering process on each of signal components (a luminance signal component and color difference signal components) after setting the intensity of a filter for removing the block distortion for each of the signal components according to a coding mode (an intra coding mode or an inter coding mode) selected by a coding controlling part 1.

Aspects of the disclosure provide a method of video coding includes receiving input data associated with a first block and a second block of an image frame. The method further includes identifying a reference size and performing a deblocking process if it is determined that the deblocking process is to be performed. The preforming the deblocking process may include processing pixels adjacent to the block boundary using a first set of deblocking filter settings if a first block size of the first block and a second block size of the second block are greater than the reference size, and processing the pixels using a second set of deblocking filter settings if the first block size or the second block size is not greater than the reference size.