METHOD AND APPARATUS FOR OPTIMIZING QUANTIZER VALUES IN AN IMAGE ENCODER

摘要

A quantizer controller (22) identifies a target bit value equal to a total number of bits available for encoding a frame. A total amount of distortion in the frame is modeled according to predicted quantization values for each one of the blocks. The predicted quantization values are characterized according to an amount of energy in each block and a number of bits available for encoding each block. Quantization values for each block are optimized by minimizing the modeled distortion in the frame subject to the constraint that the total number of bits for encoding the frame is equal to the target bit value. Each block is then encoded with the optimized quantization value.