RealNetworks, Inc.
PERCEPTUAL ADAPTIVE QUANTIZATION AND ROUNDING OFFSET WITH PIECE-WISE MAPPING FUNCTION

Abstract:

An unencoded video frame of a sequence of video frames is encoded to generate an encoded bit-stream representative of the unencoded video frame. The unencoded video frame is divided into a plurality of coding blocks. A local sensitivity measurement may be determined for each of the coding blocks. Based on the local sensitivity measurement, an encoder may determining one or more quantization parameters, one or more adaptive rounding offsets, or one or more quantization steps. The determined parameters may be provided to a quantizer of a video encoder for use in encoding the coding block of the unencoded video frame.