| 摘要 |
A coding apparatus and method is disclosed by which quantization index data can be determined without referring to a virtual buffer capacity initialized in response to a scene change. ME residual information is acquired first, and it is discriminated whether or not the ME residual information is higher than a threshold value. If it is discriminated that the ME residual information is higher than the threshold value, then the initial buffer capacity of a virtual buffer is updated. On the other hand, if it is discriminated that the ME residual information is equal to or lower than the threshold value, then it is discriminated whether or not the picture being currently processed is a picture next to a scene change or is a next picture of the same type as that of a picture with which a scene change has occurred. If it is discriminated that the picture being processed is a picture next to a scene change or a next picture of the same type, then the initial buffer capacity is calculated and updated. Further, an average value of the ME residual information is updated. The invention can be applied to a video encoder.
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