Method and system for illumination compensation and transition for video coding and processing

摘要

Deriving illumination compensation parameters and detection of illumination dominant transitions types for video coding and processing applications is described. Illumination changes such as fade-ins, fade-outs, cross-fades, and flashes are detected. Detection of these illumination changes is then used for weighted prediction to provide for improved illumination compensation.

主权项

1. A method for fade detection and determination of global or local nature of the fade in a transition from one picture to a next picture of a video signal, the method comprising:
providing a plurality of frames of a picture and related prediction reference frames; for each frame and related prediction reference frame; calculating or obtaining one or more intensity related values and one or more color related values in a first color domain, wherein the calculated one or more intensity related values and the one or more color related values comprise color components; for each frame and related prediction reference frame, calculating weighted prediction gains for each calculated color component value in the first color domain; if the weighted prediction gains are all non-negative and substantially similar to each other, then determining that a global transition with zero offset is occurring in a second color domain, wherein the weighted prediction pains are substantially similar to each other if the gains are within a threshold of 5% to 10% of each other; and, if the weighted prediction gains are not all non-negative and substantially similar to each other, then determining that at least one of the following is not occurring: a global fading transition; a global fading transition with zero offset; or a global fading transition with zero offset in the second color domain.