Patent ID: 8503521
Filing Date: 2013-08-06
Classification: H04N

Abstract:
1. A method for an encoder to compressing a block of pixels of a referencing frame image, comprising: partitioning a block of pixels into a predetermined amount of sub-blocks with each sub-block having a predetermined amount of pixel components with the encoder; if there is at least one sub-block with complexity beyond the predetermined threshold or having error of more than 3 bits for most pixel components when applying a selected lossless compression method, then taking the following procedures instead: truncating one bit of at least one sub-blocks which can originally be compressed with lossless quality for the full bit length of pixel components with the encoder, and applying the lossless compression algorithm into this sub-block with the encoder; and allocating more bits saved from the sub-block with 1 bit truncated to allow the worst case sub-block with complex pattern to use compression algorithm of reaching higher image quality with the encoder.