Patent ID: 6603813
Filing Date: 2003-08-05
Classification: H04N

Abstract:
An adaptive quantization method in a coding process for coding data values corresponding to each picture element (pel) of a portion of a video frame, the method comprising the steps of:selecting, for each portion of said video frame, a quantizer set Rx of quantizer values from a group of quantizer sets R0-Rn where each quantizer set differs from each other quantizer set; determining the distortion and bit rate characteristics of a quantized portion of said video frame provided by each quantizer set in the group R0-Rn; and selecting the quantizer set Rx based on the distortion and bit rate characteristics of said quantized portion of said video frame; and correlating each data value with a quantizer value from the selected quantizer set Rx to provide a quantized set of values corresponding to the pel data values.