Abstract: Embodiments of the present disclosure provide a solution for video processing. A method for video processing is proposed. The method comprises: determining, for a conversion between a current video block of a video and a bitstream of the video, motion information and location information of at least one subblock of a temporal block in a collocated frame of the current video block; determining an affine candidate of the current video block by applying a regression process to the current video block based on the motion information and the location information of the at least one subblock; and performing the conversion based on the affine candidate.

Abstract: Embodiments of the present disclosure provide a solution for video processing. A method for video processing is proposed. The method comprises: obtaining, for a conversion between a current video block of a video and a bitstream of the video, values for a set of adjusting parameters associated with values for a set of model parameters of a local illumination compensation (LIC) model for coding the current video block; updating the values for the set of model parameters based on the values for the set of adjusting parameters; and performing the conversion based on the updated values for the set of model parameters.

Abstract: Embodiments of the present disclosure provide a solution for video processing. A method for video processing is proposed. The method comprises: determining, during a conversion between a target video block of a video and a bitstream of the video, at least one mapping relationship between a first set of values of a first color component and a second set of values of a second color component; determining a cross-component prediction of the target video block based on the at least one mapping relationship; and performing the conversion based on the cross-component prediction.

Abstract: Apparatus and methods for providing software and hardware based solutions to the problem of synthesizing noise for a digital image. According to one aspect, a probability image is generated and noise blocks are randomly placed at locations in the probability image where the locations have probability values that are compared to a threshold criterion, creating a synthesized noise image. Embodiments include generating synthesized film grain images and synthesized digital camera noise images.

Abstract: Apparatus and methods for providing software and hardware based solutions to the problem of synthesizing noise for a digital image. According to one aspect, a probability image is generated and noise blocks are randomly placed at locations in the probability image where the locations have probability values that are compared to a threshold criterion, creating a synthesized noise image. Embodiments include generating synthesized film grain images and synthesized digital camera noise images.

Abstract: A method and apparatus for predictive coding of spherical or 360-degree video with dynamics dominated by camera motion. To achieve efficient compression, a geodesic translation motion model is introduced to characterize the perceived motion of objects on the sphere. Pixels in the surrounding objects are perceived as translating on the sphere along their respective geodesics, which intersect at the two points where a line, determined by the motions of the camera and surrounding objects, intersects the sphere. This motion compensation perfectly models the perceived motion on the sphere, and accounts for perspective distortions due to camera and object motions. Experimental results demonstrate that the preferred embodiments of the present invention achieve significant performance gains over prevalent motion-compensated prediction techniques, across various projection geometries.

Abstract: A method and apparatus for predictive coding of spherical or 360-degree video. To achieve efficient compression, a rotational motion model is introduced to characterize motion on the sphere, specifically, in terms of sphere rotations about given axes. This model preserves an object's shape and size on the sphere. A motion vector in this model implicitly specifies an axis of rotation and the degree of rotation about that axis, to convey actual motion of the object on the sphere. Complementary to the rotational motion model, an effective location-invariant motion search technique that is agnostic of the projection format is provided that is tailored to the sphere's geometry. Experimental results demonstrate that the preferred embodiments of this invention achieve significant gains over prevalent motion models, across various projection geometries.