Patent ID: 7203374
Filing Date: 2007-04-10
Classification: G06T

Abstract:
1. A method of performing a two-dimensional orthogonal transformation and quantization on an input pixel block, comprising the following step in which with one of a horizontal direction and a vertical direction fixed as a first direction and the other fixed as a second direction, in a process of resolving said two-dimensional orthogonal transformation into one-dimensional orthogonal transformations in said first direction and said second direction, with respect to each signal vector to be orthogonal-transformed in said second direction after having been orthogonal-transformed in said first direction, when a power value obtained by calculating a power of said signal vector is below a predetermined threshold enabling at least one of quantized coefficient signals to take a value other than zero, the second-directional orthogonal transformation and quantization processing as for the corresponding signal vector is omitted and a quantized coefficient signal vector simply consisting of zeros is supplied as a calculation result.