Signal processing device, signal processing method, solid-state image sensor, imaging device, electronic device, and program

A signal processing method comprising steps of:

• selecting a pixel position on an input image as a current pixel being a pixel in a current position a pixel value of which is interpolated;
• setting at least two groups of lines, each group including assembly of at least one line in the same direction including at least two pixels having known pixel values in the vicinity of the current pixel as candidate lines;
• narrowing the candidate lines on the basis of a pattern to which the current pixel belongs;
• and
• calculating the pixel value of the current pixel as an interpolated value by interpolation based on each pixel on the narrowed candidate line.

A program which allows a computer to serve as:

• a current position selection unit which selects a pixel position on an input image as a current pixel being a pixel in a current position a pixel value of which is interpolated;
• a candidate line setting unit which sets at least two groups of lines, each group including assembly of at least one line in the same direction including at least two pixels having known pixel values in the vicinity of the current pixel as candidate lines;
• a candidate line narrowing unit which narrows the candidate lines on the basis of a pattern to which the current pixel belongs;
• and
• an interpolated value calculation unit which calculates the pixel value of the current pixel as an interpolated value by interpolation based on each pixel on the candidate line narrowed by the candidate line narrowing unit.

A solid-state image sensor comprising:

• a current position selection unit which selects a pixel position on an input image as a current pixel being a pixel in a current position a pixel value of which is interpolated;
• a candidate line setting unit which sets at least two groups of lines, each group including assembly of at least one line in the same direction including at least two pixels having known pixel values in the vicinity of the current pixel as candidate lines;
• a candidate line narrowing unit which narrows the candidate lines on the basis of a pattern to which the current pixel belongs;
• and
• an interpolated value calculation unit which calculates the pixel value of the current pixel as an interpolated value by interpolation based on each pixel on the candidate line narrowed by the candidate line narrowing unit.

An imaging device comprising:

• a current position selection unit which selects a pixel position on an input image as a current pixel being a pixel in a current position a pixel value of which is interpolated;
• a candidate line setting unit which sets at least two groups of lines, each group formed of assembly of at least one line in the same direction including at least two pixels having known pixel values in the vicinity of the current pixel as candidate lines;
• a candidate line narrowing unit which narrows the candidate lines on the basis of a pattern to which the current pixel belongs;
• and
• an interpolated value calculation unit which calculates the pixel value of the current pixel as an interpolated value by interpolation based on each pixel on the candidate line narrowed by the candidate line narrowing unit.

An electronic device comprising:

• a current position selection unit which selects a pixel position on an input image as a current pixel being a pixel in a current position a pixel value of which is interpolated;
• a candidate line setting unit which sets at least two groups of lines, each group including assembly of at least one line in the same direction including at least two pixels having known pixel values in the vicinity of the current pixel as candidate lines;
• a candidate line narrowing unit which narrows the candidate lines on the basis of a pattern to which the current pixel belongs;
• and
• an interpolated value calculation unit which calculates the pixel value of the current pixel as an interpolated value by interpolation based on each pixel on the candidate line narrowed by the candidate line narrowing unit.