Adaptive buffer/quantizer control for transform video coders

Details Adaptive buffer/quantizer control for transform video coders Adaptive buffer/quantizer control for transform video coders

H - Electricity

04

N

H04N 7/12 (2006.01) G06T 9/00 (2006.01) H04N 7/26 (2006.01) H04N 7/30 (2006.01) H04N 7/32 (2006.01) H04N 7/50 (2006.01)

Patent

CA 2050102

Adaptive Buffer/Quantizer Control for Transform Video Coders Abstract A buffer/quantizer controller in a video coder utilizes the average quantization step size employed for the previous frame, the average number of bits produced per pel by the video coder for the image contained in the previous frame and the current frame buffer fullness level to obtain an indication of image complexity. A target current frame quantization step size be employed by the video coder in encoding a current frame is based on the indication of image complexity. Optionally, the target frame quantization step size is adjusted by amapping procedure, at predetermined intervals within each frame period, to account for the current buffer fullness. The map employed by the mapping procedure is adjusted in accordance with the target frame quantization step size [FIG. 3].

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