Color imaging element and imaging device
A color filter array of a color imaging element is formed with a basic array pattern repeatedly disposed in a horizontal direction and a vertical direction. The basic array pattern is formed with RGB filters arrayed in an array pattern corresponding to 5×5 pixels in the horizontal direction and the vertical direction. A ratio of all pixel numbers of a G pixel is made larger than a ratio of a pixel number of each color of RB. The G filter is disposed in each line in the horizontal, vertical and oblique directions of the color filter array. One or more R and B filters are disposed in each filter line in the horizontal and vertical directions of the color filter array in the basic array pattern. Filters of different colors are adjacently disposed in each of the horizontal, vertical and oblique directions of the R and B filter.
1. A single-plate color imaging element including:
multiple pixels including photoelectric conversion elements arrayed in a first direction and a second direction which is perpendicular to the first direction; and
color filters which are respectively arrayed on the multiple pixels,
wherein: an array of the color filters includes a basic array pattern in which the color filters are arrayed in an array pattern corresponding to N×N (N is an odd number equal to or greater than 5) pixels in the first direction and the second direction, and the array is formed by repeatedly disposing the basic array pattern in the first direction and the second direction;
the color filters include first filters which are green filters and second filters which are red and blue filters, a ratio of the first filters to the total number of filters is larger than a ratio of the second filters to the total number of filters, and the array of the color filters comprises only red, green, and blue filters;
one or more first filters are disposed in each filter line in each direction including the first direction, the second direction, and a third direction and a fourth direction that incline to the first direction and the second direction, in the array of the color filters;
second filters of each color of the second colors are disposed in each filter line in the first direction and the second direction in the basic array pattern one by one; and
each color filter adjacently disposed in the first through fourth directions to each second filter of a particular second color in the basic array pattern is either a first filter or a second filter of a second color different from the particular second color.
2. The color imaging element according to claim 1 ,
wherein, in each direction of the second filter of one color among each color of the second colors in the basic array pattern, the second filter of a different color from that second filter or the first filter is adjacently disposed.
3. The color imaging element according to claim 2 ,
wherein the basic array pattern includes a 2×2 array of green filters.
4. The color imaging element according to claim 2 ,
wherein, when a direction different from the first direction by θ° shown by an equation (1) is assumed to be a fifth direction, oblique filter arrays formed by disposing the second filters of one color among each color of the second colors at regular intervals along the fifth direction, are disposed at regular intervals along the second direction
θ=tan −1 (½). Equation (1)
5. The color imaging element according to claim 1 ,
wherein, when the color filter is a square shape, the third direction and the fourth direction are different by 45° with respect to the first direction and the second direction respectively.
6. A single-plate color imaging element including:
multiple pixels including photoelectric conversion elements arrayed in a first direction and a second direction which is perpendicular to the first direction; and
color filters which are respectively arrayed on the multiple pixels,
wherein: an array of the color filters includes a basic array pattern in which the color filters are arrayed in an array pattern corresponding to N×N (N is an odd number equal to or greater than 5) pixels in the first direction and the second direction, and the array is formed by repeatedly disposing the basic array pattern in the first direction and the second direction;
the color filters include first filters corresponding to a first color whose transmittance peak is within a wavelength range from 480 nm to 570 nm, and second filters corresponding to second colors of two or more colors whose transmittance peak is outside the range, and a ratio of the first filters to a total number of filters is larger than a ratio of the second filters to the total number of filters;
one or more first filters are disposed in each filter line in each direction including the first direction, the second direction, and a third direction and a fourth direction that incline to the first direction and the second direction, in the array of the color filters;
second filters of each color of the second colors are disposed in each filter line in the first direction and the second direction in the basic array pattern one by one; and
each color filter adjacently disposed in the first through fourth directions to each second filter of a particular second color in the basic array pattern is either a first filter or a second filter of a second color different from the particular second color.
7. A single-plate color imaging element including:
multiple pixels including photoelectric conversion elements arrayed in a first direction and a second direction which is perpendicular to the first direction; and
color filters which are respectively arrayed on the multiple pixels,
wherein: an array of the color filters includes a basic array pattern in which the color filters are arrayed in an array pattern corresponding to N×N (N is an odd number equal to or greater than 5) pixels in the first direction and the second direction, and the array is formed by repeatedly disposing the basic array pattern in the first direction and the second direction;
the color filters include first filters corresponding to a first color and second filters corresponding to second colors of two or more colors whose transmittance is lower than that of the first filters within a wavelength range from 500 nm to 560 nm, and a ratio of the first filters to a total number of filters is larger than a ratio of the second filters to the total number of filters;
one or more first filters are disposed in each filter line in each direction including the first direction, the second direction, and a third direction and a fourth direction that incline to the first direction and the second direction, in the array of the color filters;
second filters of each color of the second colors are disposed in each filter line in the first direction and the second direction in the basic array pattern one by one; and
each color filter adjacently disposed in the first through fourth directions to each second filter of a particular second color in the basic array pattern is either a first filter or a second filter of a second color different from the particular second color.
8. An imaging device comprising:
an imaging optical system;
a color imaging element in which an object image is formed through the imaging optical system; and
an image data generation unit configured to generate image data of the formed object image,
wherein the color imaging element is the color imaging element according to claim 1 .