Image processing apparatus and storage medium storing image processing program

An image processing apparatus having a one CCD, two CCD, or three CCD with spatial pixel offset imaging system, comprising:

• a local region extraction section for sequentially scanning an image signal in units of pixels and extracting a local region containing a current pixel of interest;
• a parameter calculation section for setting a plurality of small regions in the local region extracted by said local region extraction section and calculating a parameter for region segmentation from each small region;
• a local region segmentation section for segmenting the local region into uniform regions having single color correlation on the basis of parameters calculated by said parameter calculation section;
• a selective regression section for selecting color signals belonging to the same region as that of the current pixel of interest in the local region segmented by said local region segmentation section on the basis of the uniform region and regressing color correlation between the color signals to a linear formula;
• and
• a first restoring section for selecting color signals belonging to the same region as that of the current pixel of interest in the local region segmented by said local region segmentation section on the basis of the uniform region and restoring a missing color signal in the same region as that of the current pixel of interest on the basis of the color signals and the linear formula.

An image processing apparatus having a one CCD, two CCD, or three CCD with spatial pixel offset imaging system, comprising:

• a first restoring section for restoring a missing color signal of an image signal sensed by said imaging system by linear interpolation;
• a conversion section for converting the image signal restored by said first restoring section into an original image signal obtained by said imaging system;
• a second restoring section for restoring a missing color signal of the image signal converted by said conversion section on the basis of color correlation between color signals;
• and
• a switching section for switching between said conversion section and said second restoring section.

A computer-readable storage medium which stores a program comprising an instruction causing a computer to execute:

• parameter calculation processing of sequentially scanning, in units of pixels, an image signal obtained by imaging with a one CCD, two CCD, or three CCD with spatial pixel offset imaging system and calculating a parameter for region segmentation from at least one neighboring region containing a current pixel of interest;
• image signal segmentation processing of segmenting the image signal into uniform regions having single color correlation on the basis of calculated parameters;
• regression processing of regressing, to a linear formula, the color correlation between color signals in the uniform region;
• and
• restoring processing of restoring a missing color signal on the basis of the linear formula and the color signals present in the uniform region.

A computer-readable storage medium which stores a program comprising an instruction causing a computer to execute:

• local region extraction processing of sequentially scanning, in units of pixels, an image signal obtained by imaging with a one CCD, two CCD, or three CCD with spatial pixel offset imaging system and extracting a local region containing a current pixel of interest;
• parameter calculation processing of setting a plurality of small regions in the extracted local region and calculating a parameter for region segmentation from each small region;
• local region segmentation processing of segmenting the local region into uniform regions having single color correlation on the basis of calculated parameters;
• selective regression processing of selecting color signals belonging to the same region as that of the current pixel of interest in the local region on the basis of the uniform region and regressing color correlation between the color signals to a linear formula;
• and
• selective restoring processing of selecting color signals belonging to the same region as that of the current pixel of interest in the local region on the basis of the uniform region and restoring a missing color signal in the same region as that of the current pixel of interest on the basis of the color signals and the linear formula.

A computer-readable storage medium which stores a program comprising an instruction causing a computer to execute:

• first restoring processing of restoring a missing color signal of an image signal obtained by imaging with a one CCD, two CCD, or three CCD with spatial pixel offset imaging system by linear interpolation;
• conversion processing of converting the image signal restored by the first restoring processing into an original image signal obtained by said imaging system;
• second restoring processing of restoring a missing color signal of the converted image signal on the basis of color correlation between color signals;
• and
• switching processing of switching between the conversion processing and the second restoring processing.