Method and Apparatus for Sign Data Hiding of Video and Image Data

摘要

A method and apparatus for processing transform coefficients for a video coder or encoder is disclosed in the present invention. Embodiments according to the present invention reduce the storage requirement for sign bit hiding (SBH), improve the parallelism of SBH processing or simplify parity checking. Partial quantized transform coefficients (QTCs) of a transform block may be processed before all QTCs of the transform block are received. Zero and non-zero QTCs of a scan block may be processed concurrently and the QTCs of multiple scan blocks in a transform block may also be processed concurrently when computing cost function for SBH compensation. The range for searching for a value-modification QTC may be less than the scan block to be processed. Parity checking on QTCs may be based on least significant bits (LSBs) of all QTCs or all non-zero QTCs of a scan block.

主权项

1. A method of processing transform coefficients for a video encoder or an image processor, the method comprising:
receiving one or more quantized transform coefficients (QTCs) of a transform block, wherein the transform block consists of M QTCs, M is a first positive integer, and the transform block is divided into one or more scan blocks; and applying sign bit hiding process on N QTCs before remaining QTCs of the transform block are received, wherein N is a second positive integer smaller than M and said sign bit hiding process comprises encoding a sign flag for each non-zero quantized transform coefficient (QTC) of the scan block except for a candidate QTC.