IMAGE-PICKUP UNIT, IMAGE-PICKUP APPARATUS, AND IMAGE PROCESSING SYSTEM

摘要

An image-pickup unit includes an image sensor and a color filter. Each filter segment of the color filter corresponds to one of a plurality of pixels of the image sensor, and the plurality of filter segments include first to Z-th (2L≦Z≦2L, where L is an integer equal to or larger than four) filter segments having spectral transmittances for transmitted wavelength bands different from each other among light from an object. Each pixel of the image sensor receives light of a plurality of wavelength bands. The plurality of filter segments are irregularly disposed.

主权项

1. An image-pickup unit comprising:
an image sensor including M×N pixels and configured to photoelectrically convert an object image; and a color filter disposed on an object side of the image sensor, and including a plurality of filter segments, wherein each filter segment corresponds to one of the pixels of the image sensor, and the plurality of filter segments include first to Z-th filter segments having spectral transmittances different from each other, wherein a condition below is satisfied:0.4<1L∑k=1LPkMN<0.92L-1≤Z≤2L where L is an integer equal to or larger than four, and Pk represents the number of pixels of the image sensor, which receive light of a wavelength band k (k=1, 2, . . . , L), and wherein a condition below is satisfied:0.1≤1(L-1)L(∑k1=1L∑k2=1LRk1,k2-L)≤0.9whereRk1,k2=∑j=1N∑i=1MFk1(i,j)Fk2(i,j)∑j=1N∑i=1MFk1(i,j)2×∑j=1N∑i=1MFk2(i,j)2 where Fk(i,j) (i=1, 2, . . . , M, and j=1, 2, . . . , N) represents a distribution of the spectral transmittance corresponding to the wavelength band k, Fk1 represents a distribution of the spectral transmittance corresponding to a wavelength band k1 (k1=1, 2, . . . , L), Fk2 represents a distribution of the spectral transmittance corresponding to a wavelength band k2 (k2=1, 2, . . . , L), and Rk1,k2 represents a cross-correlation between the Fk1 and the Fk2.