Patent ID: 7760966

Claim:
A method comprising, with use of a processor: downscaling a digital coloured matrix image by selected ratios M 2 /M 1 and N 2 /N 1 , in which the matrix image includes N 1 rows, each row including M 1 pixels, so that the values of the pixels form the matrix and the pixels of different colours form the selected format, and using scaling to form an output matrix, of a size M 2 ×N 2 , the pixels corresponding to sub-groups of the original matrix, in such a way that M 2 <=M 1 and N 2 <=N 1 , and from the values Input(j,i) of which pixels (i,j) the value Output(l,k) of each output pixel (k,l) of the output matrix is calculated, forming the weighted sums of the values of the same-colour pixels (i,j) of the matrix image in the area of each output pixel (k,l) parallel in line memories arranged for each colour, calculating for each input pixel a weighting coefficient representing the dimension share of the pixel (i,j) in the area of the output pixel (k,l), and correcting each weighted sum by a scaling factor.