Color imaging element and imaging device

摘要

The color imaging element and the imaging device according to the present invention can improve reproduction precision of demosaicing processing in a high frequency region and suppress aliasing. Further, the color imaging element can achieve high resolution by reducing occurrence of color moire (false color). Furthermore, the color imaging element and the imaging device can perform pixel demosaicing processing with high precision. Still furthermore, a basic array pattern including a square pattern and a grating filter line is repeated in a first direction and a second direction, and thus a color filter array can perform signal processing in a subsequent stage according to a repeating pattern of the square pattern and the grating filter line, and can simplify the processing in a subsequent stage more than a conventional random array.

主权项

1. A color imaging element as a single-plate color imaging element comprising:
a plurality of pixels composed of photoelectric conversion elements disposed in a first direction and in a second direction perpendicular to the first direction; and color filters disposed on the plurality of pixels, wherein an array of the color filters includes a basic array pattern having the color filters arranged in an array pattern corresponding to M×N (each value of M and N is 8 or more) pixels in the first direction and in the second direction, and the basic array pattern is repeatedly placed in the first direction and in the second direction, the basic array pattern includes a first filter corresponding to a first color having one or more colors and a second filter corresponding to a second color having two or more colors, in which a contribution ratio of the second color for acquiring a brightness signal is lower than the contribution ratio of the first color, the basic array pattern includes four or more square patterns corresponding to 3×3 pixels, each square pattern including one of the second filter in the center and eight of the first filters surrounding eight directions of the second filter, the array of the color filters includes therein a grating filter line in the first direction and a grating filter line in the second direction, in which the first filter and the second filter are placed side by side surrounding the four directions of the square pattern, and the array of the color filters includes therein the first filter disposed in each filter line in the first direction and in the second direction of the array of the color filters and in each filter line in a third direction and in a fourth direction inclined with respect to the first direction and the second direction, wherein in the basic array pattern, one or more second filters corresponding to each color of the second colors are placed in each filter line in the first direction and in the second direction in the basic array pattern.