Patent ID: 8249375

Claim:
An information processing apparatus for performing a wavelet transformation on an image signal, comprising: means for horizontal analysis filtering, where horizontal analysis filtering is performed to divide frequency components of said image signal into a low-pass component and a high-pass component in the horizontal direction; means for vertical analysis filtering, where vertical analysis filtering is performed to divide each of said low-pass component and said high-pass component divided by said horizontal analysis filtering in said means for performing horizontal analysis filtering into a low-pass component and a high-pass component in the vertical direction; means for horizontal control performing horizontal control for performing said horizontal analysis filtering on said frequency components of a first information volume when it is in an unsteady state where a first arithmetic coefficient which is a coefficient available for horizontal analysis filtering is not present, and performing said horizontal analysis filtering on said frequency components of a second information volume using said first arithmetic coefficient when it is in a steady state where said first arithmetic coefficient is present; means for first control for allowing said means for horizontal control to repetitively perform said horizontal control until said horizontal analysis filtering is performed on all of columns of a processing object line; means for vertical control performing vertical control for performing said vertical analysis filtering on said low-pass component and said high-pass component of a third information volume when it is in an unsteady state where a second arithmetic coefficient which is a coefficient available for vertical analysis filtering is not present, and performing said vertical analysis on said low-pass component and said high-pass component on a fourth information volume using said second arithmetic coefficient when it is in a steady state where said second arithmetic coefficient is present; and means for second control for allowing said means for vertical control to repetitively perform said vertical control until said vertical analysis filtering is performed on all of lines.