Apparatus and method for creating an alternate reference frame for video compression using maximal differences

摘要

Apparatuses and methods for compressing a video signal having at least one frame with at least one block of pixel data are disclosed. A target block is selected, and an alternate reference block that is a predictor for blocks of a sequence of frames is compared to a predictor block to determine whether to create a second alternate reference block as a predictor. When a difference between the alternate reference block and the predictor block is less than a threshold, certain blocks from the sequence of frames that are more different from the first alternate reference block than other non-selected blocks are selected, and the second alternate reference block is created using the selected blocks. In this way, a predictor block that is different from a golden frame predictor is made available when an existing alternate reference block is too similar to the golden frame predictor to be useful.