| 摘要 |
PURPOSE:To improve subjective picture quality by correcting a variance depending whether smooth motion is important or definition is important in the system controlling a quantizer based on a generated code quantity. CONSTITUTION:A variance calculation means 2 obtains a quantization variance being a variance of a quantization step size based on a code quantity calculated by a generating code quantity calculation means 1. A variance correction frame discrimination section 6 discriminates a frame to be corrected for the variance when a quantization variance is positive in a frame with a large motion and a quantization variance is negative in a frame with a small motion and discriminates a frame to be a frame whose variance is not corrected in other cases. When a frame is discriminated to be a variance correction frame, a variance correction section 3 corrects the variance to increase a change in the quantization device and it is informed to a quantization device decision section 4. |
