Lens shading correction method and image signal processing device and image sensor system employing the method

摘要

A lens shading correction method includes providing lens shading correction profile data; calculating an intensity values of light passing through each of one or more visible light pass filters and each of one or more infrared light pass filters; calculating an average of the intensity values of the light passing through the one or more visible light pass filters; calculating an average of the intensity values of the light passing through the one or more infrared light pass filters; calculating a normalized intensity value of the light passing through the one or more infrared light pass filters, based on the calculated averages; adjusting one or more lens shading correction coefficients included in the lens shading correction profile data and each having a value varying depending on a frequency element of light, based on the calculated normalized intensity value; and correcting lens shading by using the adjusted lens shading correction coefficient.

主权项

1. A method comprising:
receiving, at a photo-sensitive element array, light which has passed through a lens; providing lens shading correction profile data for the lens, the lens shading correction profile data including one or more lens shading correction coefficients; calculating one or more intensity values of one or more first portions of light passing through one or more visible light pass filters; calculating one or more intensity values of one or more second portions of light passing through one or more infrared light pass filters; calculating an average of the one or more intensity values of the one or more first portions of the light passing through the one or more visible light pass filters; calculating an average of the one or more intensity values of the one or more second portions of the light passing through the one or more infrared light pass filters; calculating a normalized intensity value of the one or more second portions of the light passing through the one or more infrared light pass filters, based on the average of the one or more intensity values of the one or more first portions of the light passing through the one or more visible light pass filters and the average of the one or more intensity values of the one or more second portions of the light passing through the one or more infrared light pass filters; adjusting the one or more lens shading correction coefficients based on the calculated normalized intensity value of the one or more second portions of the light passing through the one or more infrared light pass filters; and correcting lens shading produced by the lens by using the one or more adjusted lens shading correction coefficients.