Interpolation processing apparatus and recording medium having interpolation processing program recorded therein

An interpolation processing apparatus that engages in processing on image data which are provided in a calorimetric system constituted of first˜nth (n≧2) color components and include color information corresponding to a single color component provided at each pixel to determine an interpolation value equivalent to color information corresponding to the first color component for a pixel at which the first color component is missing, comprising:

• an interpolation value calculation section that calculates an interpolation value including at least two terms, i.e., a first term and a second term by using color information at pixels set in a local area containing an interpolation target pixel to undergo interpolation processing;
• a first similarity judgement section that judges degrees of similarity to the interpolation target pixel along at least two directions in which pixels having color information corresponding to the first color component are connected to the interpolation target pixel;
• and
• a second similarity judgment section that judges degrees of similarity to the interpolation target pixel along at least two directions other than the directions in which the degrees of similarity are judged by said first similarity judgment section, wherein:
• said interpolation value calculation section selects a direction along which pixels having color information to be used to calculate said first term are set based upon results of a judgment made by said first similarity judgment section and selects a direction along which pixels having color information to be used to calculate said second term are set based upon results of a judgment made by said second similarity judgment section.

An interpolation processing apparatus that engages in processing on image data which are provided in a calorimetric system constituted of first˜nth (n≧2) color components and include color information corresponding to a single color component provided at each pixel to determine an interpolation value equivalent to color information corresponding to the first color component for a pixel at which the first color component is missing, comprising:

• a first term calculation section that calculates a first term representing average information of the first color component with regard to an interpolation target pixel to undergo interpolation processing by using color information corresponding to color components at pixels set in a local area containing the interpolation target pixel;
• a second term calculation section that calculates a second term representing local curvature information based upon a color component matching the color component at the interpolation target pixel with regard to the interpolation target pixel by using color information corresponding to color components at pixels set in a local area containing the interpolation target pixel;
• and
• an interpolation value calculation section that calculates an interpolation value by adding said second term multiplied by a weighting coefficient constituted of color information corresponding to a plurality of color components at pixels in the local area containing the interpolation target pixel to said first term.

An interpolation processing apparatus that implements processing for supplementing a color component value at a pixel at which information corresponding to a color component is missing in image data provided in a calorimetric system constituted of a luminance component and the color component, with the luminance component having a higher spatial frequency than the color component and the luminance component present both at pixels having information corresponding to the color component and at pixels lacking information corresponding to the color component, comprising:

• a hue value calculation section that calculates hue values at a plurality of pixels located near an interpolation target pixel to undergo interpolation processing and having both the luminance component and the color component by using luminance component values and color component values at the individual pixels;
• a hue value interpolation section that calculates a hue value at the interpolation target pixel by using a median of the hue values at the plurality of pixels calculated by said hue value calculation section;
• and
• a color conversion section that interpolates a color component at the interpolation target pixel by using the luminance component at the interpolation target pixel to convert the hue value at the interpolation target pixel calculated by said hue value interpolation section to a color component.

An interpolation processing apparatus that implements processing for supplementing a luminance component at a pixel at which information corresponding to a luminance component is missing and supplementing a color component at a pixel at which information corresponding to a color component is missing, on image data provided in a calorimetric system constituted of the luminance component and the color component, with the luminance component having a higher spatial frequency than the color component and a given pixel having only information corresponding to either the luminance component or the color component, comprising:

• a luminance component interpolation section that interpolates a luminance component at a luminance component interpolation target pixel to undergo luminance component interpolation processing by using at least either “similarity manifesting between the luminance component interpolation target pixel and a pixel near the luminance component interpolation target pixel” or “a plurality of color components within a local area containing the luminance component interpolation target pixel”;
• a hue value calculation section that calculates hue values at a plurality of pixels located near an interpolation target pixel to undergo color component interpolation processing, having color component values and having luminance component values interpolated by said luminance component interpolation section, by using the luminance component values and color component values at the individual pixels;
• a hue value interpolation section that calculates a hue value for the interpolation target pixel by using a median of the hue values at the plurality of pixels calculated by said hue value calculation section;
• and
• a color conversion section that interpolates a color component value for the interpolation target pixel by using the luminance component value at the interpolation target pixel to convert the hue value at the interpolation target pixel calculated by said hue value interpolation section to a color component value.

A recording medium having recorded therein an interpolation processing program to implement on a computer processing for determining an interpolation value equivalent to color information corresponding to a first color component missing at a pixel, on image data provided in a colorimetric system constituted of first˜nth (n≧2) color components with color information corresponding to a single color component present at each pixel, said interpolation processing program comprising:

• an interpolation value calculation step in which an interpolation value including, at least
• (1) local average information of the first color component with regard to an interpolation target pixel to undergo the interpolation processing;
• and
• (2) local curvature information based upon a color component other than a color component at the interpolation target pixel, is calculated by using color information provided at pixels set within a local area containing the interpolation target pixel.

A recording medium having recorded therein an interpolation processing program to implement on a computer processing for determining an interpolation value equivalent to color information corresponding to a first color component missing at a pixel, on image data provided in a colorimetric system constituted of first˜nth (n≧2) color components with color information corresponding to a single color component present at each pixel, said interpolation processing program comprising:

• an interpolation value calculation step in which an interpolation value including at least two terms, i.e., a first term and a second term is calculated by using color information at pixels set within a local area containing an interpolation target pixel to undergo interpolation processing;
• a first similarity judgment step in which degrees of similarity to the interpolation target pixel are judged along at least two directions in which pixels having color information corresponding to the first color component are connected with the interpolation target pixel;
• and
• a second similarity judgment step in which degrees of similarity to the interpolation target pixel are judged along at least two directions other than the directions along which the degrees of similarity are judged in said first similarity judgment step, wherein:
• in said interpolation value calculation step, a direction in which pixels having color information to be used to calculate said first term are set is selected based upon results of a judgment made in said first similarity judgment step and a direction in which pixels having color information to be used to calculate said second term are set is selected based upon results of a judgment made in said second similarity judgment step.

A recording medium having recorded therein an interpolation processing program to implement on a computer processing for determining an interpolation value equivalent to color information corresponding to a first color component missing at a pixel, on image data provided in a calorimetric system constituted of first˜nth (n≧2) color components with color information corresponding to a single color component present at each pixel, said interpolation processing program comprising:

• a first term calculation step in which a first term representing average information of the first color component with regard to an interpolation target pixel to undergo interpolation processing is calculated by using color information corresponding to a color component at pixels set within a local area containing the interpolation target pixel;
• a second term calculation step in which a second term representing local curvature information based upon a color component matching the color component at the interpolation target pixel is calculated with regard to the interpolation target pixel by using color information corresponding to a color component at pixels set within a local area containing the interpolation target pixel;
• and
• an interpolation value calculation step in which an interpolation value is calculated by adding said second term multiplied by a weighting coefficient constituted of color information corresponding to a plurality of color components provided at pixels set within a local area containing the interpolation target pixel to the first term.

A recording medium having recorded therein an interpolation processing program for implementing on a computer processing supplementing a color component value at a pixel at which information corresponding to a color component is missing, on image data provided in a colorimetric system constituted of a luminance component and the color component, with the luminance component having a higher spatial frequency than the color component and the luminance component present both at pixels having information corresponding to the color component and at pixels lacking information corresponding to the color component;

• said interpolation processing program comprising:
• a hue value calculation step in which hue values for a plurality of pixels near an interpolation target pixel to undergo interpolation processing and having information corresponding to both the luminance component and the color component are calculated by using luminance component values and color component values at the individual pixels;
• a hue value interpolation step in which a hue value for the interpolation target pixel is calculated by using a median of the hue values at the plurality of pixels calculated in the hue value calculation step;
• and
• a color conversion step in which a color component value at the interpolation target pixel is interpolated by using a value indicated by the luminance component present at the interpolation target pixel to convert the hue value of the interpolation target pixel calculated in the hue value interpolation step to a color component value.

A recording medium having recorded therein an interpolation processing program for implementing on a computer processing for supplementing a luminance component value at a pixel at which information corresponding to a luminance component is missing and a color component value at a pixel at which information corresponding to a color component missing, on image data provided in a calorimetric system constituted of the luminance component and the color component, with the luminance component having a higher spatial frequency than the color component and information corresponding to either the luminance component or the color component present at each pixel, said interpolation processing program comprising:

• a luminance component interpolation step in which a luminance component value is interpolated for a luminance component interpolation target pixel to undergo luminance component interpolation processing by using at least either “similarity between the luminance component interpolation target pixel and a pixel near the luminance component interpolation target pixel” or “information corresponding to a plurality of color components within a local area containing the luminance component interpolation target pixel”;
• a hue value calculation step in which hue values at a plurality of pixels located near an interpolation target pixel to undergo color component interpolation processing, having color component values and having luminance component values interpolated in said luminance component interpolation step are calculated by using the luminance component values and color component values at the individual pixels;
• a hue value interpolation step in which a hue value for the interpolation target pixel is calculated by using a median of the hue values at the plurality of pixels calculated in the hue value calculation step;
• and
• a color conversion step in which a color component value is interpolated for the interpolation target pixel by using the luminance component value at the interpolation target pixel to convert the hue value at the interpolation target pixel calculated in said hue value interpolation step to a color component value.