Patent ID: 6529632
Filing Date: 2003-03-04
Classification: G06T,H04N

Abstract:
An image coding method comprising the steps of:storing a reference image which is a decoded image of an image previously coded based on a first prediction image synthesized by performing motion compensation; estimating motion vectors based on a comparison of an input image to be coded and the reference image; and synthesizing a second prediction image by performing motion compensation using the motion vectors and the reference image; wherein a positive/negative rounding method used for pixel value interpolation in performing the motion compensation for synthesizing the first prediction image is one of a positive rounding method and a negative rounding method; and wherein a positive/negative rounding method used for pixel value interpolation in performing the motion compensation for synthesizing the second prediction image is one of the positive rounding method and the negative rounding method which is different from the one of the positive rounding method and the negative rounding method used for the pixel value interpolation in performing the motion compensation for synthesizing the first prediction image.