| 摘要 |
Deterioration in the quality of predicted images is to be reduced so as to restrain decreases in compression efficiency. When a motion prediction/compensation unit 32 generates predicted image data by performing motion compensation with the use of reference image data, based on a motion vector detected through motion detection, the filter characteristics of an interpolation filter that determines image data with fractional pixel precision of the reference image data of the current block are changed in accordance with the size of the motion vector. As a result, the filter characteristics are changed to characteristics for performing denoising when the motion size is large, and to characteristics for not performing filtering operations when a large amount of high-pass components is contained in the reference image, such as when the motion vector has integer pixel precision, the motion size is small, and motion blurring does not often occur. Thus, decreases in compression efficiency due to deterioration in the quality of predicted images can be restrained.
|
