Patent ID: 9154788
Filing Date: 2015-10-06
Classification: H04N

Abstract:
1. An image coding method for predicting chrominance according to a linear model, using luminance of an image, the image coding method comprising: obtaining image format information from an input image; determining a subsampling method for a luminance signal using the image format information; storing the subsampling method in a memory; obtaining the subsampling method from the memory; performing, by the subsampling method, subsampling on a coded luminance signal of a surrounding pixel of a current block to be coded; calculating a parameter of the linear model using (i) the coded luminance signal that is subsampled in the performing of subsampling on the coded luminance signal of the surrounding pixel of the current block and (ii) coded chrominance of the surrounding pixel; performing, by the subsampling method, subsampling on the coded luminance signal of the current block; and calculating prediction chrominance of the current block using (i) the parameter of the linear model and (ii) the coded luminance signal that is subsampled in the performing of subsampling on the coded luminance signal of the current block.