Patent ID: 8085679

Claim:
A bit rate control method, comprising: calculating a quality measure of a current frame and a mean of quality measures of two or more previous frames in order to calculate a deviation of the quality measure of the current frame from the mean of the quality measures of the two or more previous frames; comparing the deviation to a critical value measure; and controlling a quantization parameter in response to a result of the comparison, wherein the controlling includes, resetting the quantization parameter when an absolute value of the deviation is greater than or equal to the critical value measure, wherein the resetting includes, resetting the quantization parameter to increase a quantization scale when the deviation is greater than or equal to the critical value measure, and resetting the quantization parameter to decrease the quantization scale when the deviation is less than or equal to a negative of the critical value measure, and maintaining the quantization parameter when the absolute value of the deviation is less than the critical value measure.