Method for controlling data bit rate of a video encoder

摘要

A method for controlling the data bit rate of a differential pulse code modulation/discrete cosine transform (DPCM/DCT) video encoder, which is adapted to achieve a bit rate control in accordance with a video signal band compression scheme using a differential pulse code modulation (DPCM) and a discrete cosine transform (DCT), thereby obtaining a supreme picture quality while preventing a buffer overflow or underflow phenomenon from occurring in the encoder. The method includes the steps of determining an initial bit allocation amount for every group of pictures (GOP) of an input video, allocating bits for every picture of each GOP, allocating bits for every macroblock of each picture, determining a quantizer step parameter based on the bit allocation amount, and determining a quantizer step size proportional to the determined quantizer step parameter.