Patent ID: 6393058
Filing Date: 2002-05-21
Classification: H04N

Abstract:
A moving picture coding system which includes a quantizer for quantization processing, comprising:generated bit amount calculation means for calculating a generated bit amount for each coded frame; quantization variation value calculation means for calculating a quantization variation value, which is a variation of a quantization step size from a previous frame to a current frame, in accordance with a difference in the generated bit amount between two most recently coded frames; variation value correction frame determination means for determining a frame as a frame for which correction of the quantization variation value should be performed when the frame involves a large amount of motion and the quantization variation value is positive in sign or when the frame involves a small amount of motion and the quantization variation value is negative in sign; variation value correction means for correcting, for said frame determined as the frame for which correction should be performed, the quantization variation value calculated by said quantization variation value calculation means so as to increase an absolute value of the quantization variation value; and quantization determination means for adding the quantization variation value corrected by said variation value correction means to a quantization step size of the previous frame to calculate a new quantization step size for the current frame.