MOVING PICTURE CODING APPARATUS AND METHOD

摘要

PROBLEM TO BE SOLVED: To provide a moving picture coding apparatus and method for optimally controlling a bit rate in response to coding difficulty of a moving picture so as to stabilize the image quality.

SOLUTION: A virtual VBV for permitting even an underflow and an overflow manages a code amount generated in coding frames. A code amount usable next is 'stored' by causing the virtual VBV to overflow without too much decreasing a quantization scale even in a scene for ease of coding. Conversely, a code amount is 'borrowed' by causing the virtual VBV to underflow without too much increasing the quantization scale even in a scene whose coding is difficult.

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