| 摘要 |
<P>PROBLEM TO BE SOLVED: To suppress steep deterioration in the image quality and avoid the overflow of a VBV (Video Buffering Verifier) buffer. <P>SOLUTION: An MPEG encoder is provided with a section for controlling the amount of code which decides a quantization scale. The section for controlling the amount of code calculates the amount of code assignable to each picture and decides the quantization scale on the basis of the amount of the assigned code. When calculating the amount of the assigned code for every one picture, the section for controlling the amount of code calculates the maximum amount of the assigned code (maximum amount of assigned code Pmax) taking into account the amount of VBV buffer consumption so as to avoid the VBV buffer from being overflown (step ST6). The section for controlling the amount of code decides the amount of code assignment to each picture according to the algorithm of the VBR or CBR (steps ST 7, 9) and when the amount of code assignment exceeds the maximum amount of assigned code Pmax as a result, the section for controlling the amount of code clips the amount of code assignment at the Pmax as an upper limit. <P>COPYRIGHT: (C)2005,JPO&NCIPI |
