Patent ID: 8644627

Claim:
A method of processing a compressed representation of an image block comprising multiple image elements, said compressed representation comprising a first, a second, a third and a fourth codeword and a component index sequence, said method comprising the steps of: determining a first component value based at least partly on said first codeword; determining a second component value based at least partly on said second codeword; determining a third component value based at least partly on said third codeword; determining a fourth component value based at least partly on said fourth codeword; selecting, based on said codewords or said component values, a first resolution number N 1 and a second resolution number N 2 , where N 1 is a non-zero integer and N2 is a non-zero integer; generating, based on said first and second codewords or said first and second component values, N 1 first additional component values; generating, based on said third and fourth codewords or said third and fourth component values and, N2 second additional component values; for at least one image element in said image block: selecting, based on said component index sequence, a component value from i) said first component value, ii) said second component value, iii) said N 1 first additional component value; and selecting, based on said component index sequence, a component value from i) said third component value, ii) said fourth component value, iii) said N2 second additional component values.