Patent ID: 6621934
Filing Date: 2003-09-16
Classification: H04N

Abstract:
In a video processing system, a method for quantizing pixel block data having values of positive and negative polarity about an intermediate point within an encompassing range of pixel block limit values, comprising the following steps:(a) identifying pixel values of positive polarity with respect to said intermediate point; (b) identifying pixel values of negative polarity with respect to said intermediate point; (c) assigning a common set of quantization level codes to both said identified positive and negative polarity pixel values wherein an individual pixel value is assigned a quantization level code based on absolute value of said individual pixel, to provide quantized data; and (d) adding a bias value to negative polarity pixel values to produce biased input values of positive polarity with respect to said intermediate point; and (e) outputting said compressed biased and unbiased data to an output network.