| 摘要 |
<p>In accordance with the MPEG-2 standard for compression of a digital signal representative of a video image, the image is separated into groups of several different types of pictures and those of each type are encoded by respective encoders. Depending on the complexity and bitrates of each picture, the bitrates of the encoders may vary and so must be restored to a constant bitrate by respective output buffers. Also, the global sum of the contents of the individual buffers must be maintained substantially constant so as to provide a constant global bitrate. The invention provides a method and apparatus for bitrate control of each encoder based on a measure of the complexity of the picture being processed thereby and the bitrates which are required in order to maintain a substantially equivalent quality of the pictures encoded by the respective encoders.</p> |
