Image processing apparatus, image processing method, solid-state imaging device, and electronic apparatus

An image processing method for an image processing apparatus, the method comprising:

• selecting a pixel position on an input image, as a target position in which a pixel value is interpolated;
• setting two or more sets of candidate lines including a pixel with a value, in the vicinity of the target position;
• calculating a weighted value that corresponds to a degree of expectation that the target position and the pixel position on the candidate line are on the same pattern;
• selectively determining a set of candidate lines that are close to a direction of a pattern of the target position in accordance with the weighted value of each pixel on the candidate lines;
• and
• calculating a pixel value of the target position in accordance with the weighted value of each pixel on the candidate lines.

A solid-state imaging device, comprising:

• a pixel array unit configured to regularly dispose pixels in a matrix, the pixels corresponding to a plurality of respective color components;
• and
• a signal processing unit configured to perform predetermined signal processing on a pixel signal from the pixel array unit, the signal processing unit including
• a target position selecting unit configured to select a pixel position on an input image, as a target position in which a pixel value is interpolated, the input image being obtained from the pixel signal from the pixel array unit,
• a candidate line setting unit configured to set two or more sets of candidate lines including a pixel with a value, in the vicinity of the target position,
• a weighted-value calculating unit configured to calculate a weighted value that corresponds to a degree of expectation that the target position and the pixel position on the candidate line are on the same pattern,
• a direction classifying unit configured to selectively determine a set of candidate lines that are close to a direction of a pattern of the target position in accordance with the weighted value of each pixel on the candidate lines, and
• an interpolated-value calculating unit configured to calculate a pixel value of the target position in accordance with the weighted value of each pixel on the candidate lines.

An electronic apparatus, comprising:

• a solid-state imaging device;
• and
• an image processing unit,
• the solid-state imaging device including
• a pixel array unit configured to regularly dispose pixels in a matrix, the pixels corresponding to a plurality of respective color components, and
• a signal processing unit configured to perform predetermined signal processing on a pixel signal from the pixel array unit,
• the image processing unit including
• a target position selecting unit configured to select a pixel position on an input image, as a target position in which a pixel value is interpolated, the input image being obtained from the pixel signal from the solid-state imaging device,
• a candidate line setting unit configured to set two or more sets of candidate lines including a pixel with a value, in the vicinity of the target position,
• a weighted-value calculating unit configured to calculate a weighted value that corresponds to a degree of expectation that the target position and the pixel position on the candidate line are on the same pattern,
• a direction classifying unit configured to selectively determine a set of candidate lines that are close to a direction of a pattern of the target position in accordance with the weighted value of each pixel on the candidate lines, and
• an interpolated-value calculating unit configured to calculate a pixel value of the target position in accordance with the weighted value of each pixel on the candidate lines.