Base color merging for multi-stage base color and index map (MBCIM) for RExt

摘要

An enhancement for removing signaling redundancy of base color within multi-stage base color and index map (MBCIM) processing of HEVC for computer generated screen content is presented. Redundancy is removed in response to determining and setting merge flags when neighboring pixels are coded and available. During coding of pixels in the current CU, then color are copied from the neighboring blocks when a merge flag is set, or the pixel is coded as it was previously.

主权项

1. An apparatus for base color merging for multi-stage base color and index map (MBCIM) video coding of screen content, comprising:
(a) a computer processor configured for video and image processing; and (b) programming in a non-transitory computer readable medium and executable on the computer processor with steps including: (i) performing multi-stage base color and index map (MBCIM) coding of screen content based on an intra coding framework; (ii) setting a first direction merge flag when a first neighbor of the current coding unit (CU) is determined to be available and coded with colors equal to the current coding unit (CU); (iii) setting a second direction merge flag when a second neighbor of the current coding unit (CU) is determined to be available and coded with colors equal to the current coding unit (CU); (iv) establishing a color for the current CU, by copying base color from the first neighbor to the current CU in response to detecting a first state of said first direction merge flag, or copying base color from the second neighbor to the current CU in response to detecting a first state of said second direction merge flag; and (v) coding the base color of the current CU when neither said first direction merge flag, or said second direction merge flag, is set.