IMAGE ENCODING METHOD AND IMAGE DECODING METHOD

摘要

An image encoding apparatus (400) performing pixel interpolation for creating a prediction image selects one of a pixel interpolation unit A (403) and a pixel interpolation unit B (404) according to a value of the picture type signal PicType. When the picture type signal PicType has a value "0" indicating a B picture, the pixel interpolation unit A (403) is selected. The pixel interpolation unit A is realized by a pixel filter having the number of filter taps "4" for calculating the pixel value of 1/2 pixels of the prediction image. When the picture type signal PicType has a value "1" indicating a frame other than B picture, the pixel interpolation unit B (404) is selected. The pixel interpolation unit B is realized by a pixel filter having the number of filter taps "8".