Patent ID: 6111991
Filing Date: 2000-08-29
Classification: H04N

Abstract:
A method for encoding multiple blocks in a frame of image data, comprising:identifying a target bit value equal to a total number of bits available for encoding the frame;predicting a total distortion in the frame according to predicted quantization values individually customized and assigned to each one of the blocks in the frame, the quantization values predicted for each one of the blocks according to a quantization step size model that characterizes quantization step size values according to an amount of energy in that block and a number of bits assigned to that block; said quantization step size model not relying upon selection of a quantization step size variable;the quantization step size model individually adapting optimum quantization step size values for each of the multiple blocks by minimizing the total predicted distortion in the frame subject to a constraint that the total number of bits available for encoding the frame is equal to the target bit value; andencoding the blocks with the predicted optimum quantization step size values.