Information processing apparatus and method

An information processing method used in an information processing apparatus for performing a wavelet transform on an image signal, wherein

• said information processing apparatus includes:
• 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;
• and
• 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, and
• the method comprising steps of:
• allowing said means for horizontal control to perform said horizontal analysis filtering on said frequency components of said first information volume when said means for horizontal means is in an unsteady state where a first arithmetic coefficient which is a coefficient available for horizontal analysis filtering is not present, and allowing said means for horizontal control to perform said horizontal analysis filtering on said frequency components of said second information volume using said first arithmetic coefficient when said means for horizontal means is in a steady state where said first arithmetic coefficient is present;
• allowing means for first control to allow 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;
• allowing said means for vertical control to perform said vertical analysis filtering on said low-pass component and said high-pass component of a third information volume when said means for vertical control is in an unsteady state where a second arithmetic coefficient which is a coefficient available for vertical analysis filtering is not present, and allowing said means for vertical control to perform said vertical analysis filtering on said low-pass component and said high-pass component of said fourth information volume using said second arithmetic coefficient when said means for vertical control is in a steady state where said second arithmetic coefficient is present;
• and
• allowing means for second control to allow said means for vertical control to repetitively perform said vertical control until said vertical analysis filtering is performed on all of lines.

An information processing apparatus for performing a wavelet transformation on an image signal, comprising:

• a device configured to perform 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;
• a device configured to perform 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 device configured to perform horizontal analysis filtering into a low-pass component and a high-pass component in the vertical direction;
• a device configured to perform 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;
• a device configured to perform first control for allowing said device configured to perform horizontal control to repetitively perform said horizontal control until said horizontal analysis filtering is performed on all of columns of a processing object line;
• a device configured to perform 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
• a device configured to perform second control for allowing said device configured to perform vertical control to repetitively perform said vertical control until said vertical analysis filtering is performed on all of lines.