INTERPOLATION FILTERING METHOD, IMAGE ENCODING METHOD, IMAGE DECODING METHOD, INTERPOLATION FILTERING DEVICE, PROGRAM, AND INTEGRATED CIRCUIT.

摘要

An interpolation filtering method includes a pixel selection step (S33) in which a plurality of pixels to be used in the interpolation of a pixel to be interpolated is selected from an image, a weighting coefficient determination step (S34) in which a weighting coefficient is determined for each pixel in the plurality of pixels selected in the pixel selection step, and an interpolation step (S35) in which the weighting coefficients determined in the weighting coefficient determination step (S34) are used in a weighted summation of the pixel values of the plurality of pixels to calculate the pixel value of the pixel to be interpolated. In the weighting coefficient determination step (S34), when any of the pixels in the plurality of pixels belongs to a surrounding block which is different than the target block to which the pixel to be interpolated belongs, the weighting coefficient of that pixel becomes smaller than when that pixel belongs to the target block.