A Complementary Metal-Oxide Semiconductor image sensor, CIS,, comprising: a color filter comprising a first light filter unit corresponding to a first wavelength range, a second light filter unit corresponding to a second wavelength range, and a third light filter unit corresponding to a third wavelength range; and a sub-wavelength pixel unit comprising a first photodiode, PD, column unit corresponding to the first wavelength range, a second PD column unit corresponding to the second wavelength range, and a third PD column unit corresponding to the third wavelength range; wherein a first light-receiving surface of the first PD column unit, a second light-receiving surface of the second PD column unit, and a third light-receiving surface of the third PD column unit have equal area; and first junction area of the first PD column unit, second junction area of the second PD column unit, and third junction area of the third PD column unit are unequal; each of the first PD column unit, the second PD column unit, and the third PD column unit comprises a plurality of PD columns, and the PD columns in the sub-wavelength pixel unit are arranged according to different preset angles; the first light-receiving surface is formed by light-receiving surfaces of all the PD columns of the first PD column unit, the second light-receiving surface is formed by light-receiving surfaces of all the PD columns of the second PD column unit, the third light-receiving surface is formed by light-receiving surfaces of all the PD columns of the third PD column unit, and the light-receiving surface of each PD column is one surface of the PD column that is close to the color filter; and the first junction area is total area of PN junction surfaces of all the PD columns of the first PD column unit, the second junction area is total area of PN junction surfaces of all the PD columns of the second PD column unit, the third junction area is total area of PN junction surfaces of all the PD columns of the third PD column unit, and the PN junction surface of each PD column is one surface of the PD column that is away from the color filter. a color filter comprising a first light filter unit corresponding to a first wavelength range, a second light filter unit corresponding to a second wavelength range, and a third light filter unit corresponding to a third wavelength range; and a sub-wavelength pixel unit comprising a first photodiode, PD, column unit corresponding to the first wavelength range, a second PD column unit corresponding to the second wavelength range, and a third PD column unit corresponding to the third wavelength range; wherein a first light-receiving surface of the first PD column unit, a second light-receiving surface of the second PD column unit, and a third light-receiving surface of the third PD column unit have equal area; and first junction area of the first PD column unit, second junction area of the second PD column unit, and third junction area of the third PD column unit are unequal; each of the first PD column unit, the second PD column unit, and the third PD column unit comprises a plurality of PD columns, and the PD columns in the sub-wavelength pixel unit are arranged according to different preset angles; the first light-receiving surface is formed by light-receiving surfaces of all the PD columns of the first PD column unit, the second light-receiving surface is formed by light-receiving surfaces of all the PD columns of the second PD column unit, the third light-receiving surface is formed by light-receiving surfaces of all the PD columns of the third PD column unit, and the light-receiving surface of each PD column is one surface of the PD column that is close to the color filter; and the first junction area is total area of PN junction surfaces of all the PD columns of the first PD column unit, the second junction area is total area of PN junction surfaces of all the PD columns of the second PD column unit, the third junction area is total area of PN junction surfaces of all the PD columns of the third PD column unit, and the PN junction surface of each PD column is one surface of the PD column that is away from the color filter.