Patent ID: 7742648

Claim:
An image information encoding apparatus adapted for encoding an input image signal at least including intraframe encoding image, interframe forward predictive encoding image and interframe bi-directional predictive encoding image by orthogonal transform and motion prediction and/or compensation processing to generate image compressed information, the image information encoding apparatus comprising: a motion prediction and/or compensation unit configured to perform motion prediction and/or compensation processing based on different interpolation methods with respect to the interframe forward predictive encoding image and the interframe bi-directional predictive encoding image, wherein the motion prediction and/or compensation unit includes a first filter and performs motion prediction and/or compensation processing by using the first filter with respect to the interframe forward predictive encoding image, and includes a second filter and performs motion prediction and/or compensation processing by using the second filter, the second filter having a fewer number of taps relative to the first filter with respect to the interframe bi-directional predictive encoding image, the motion prediction and/or compensation unit being configured to perform motion prediction and/or compensation of ¼ pixel accuracy, and to perform, with respect to the interframe forward predictive encoding image, interpolation processing of ½ pixel accuracy by using filter coefficients having 6 taps {1, −5, 20, 20, −5, 1}/32 to perform interpolation processing of ¼ pixel accuracy by linear interpolation in accordance with generated pixels.