Method for reducing the degradation effects of EMI wire grid on the optic performance

摘要

The mechanism of the image degradation due to the opaque metallic wire grid is analyzed and a degradation mode is built based on the theory of Fourier optics. The effect of different opaque wire grid on the image quality is simulated. We define the manner of using wire grid that will meet system requirements for both optical and shielding efficiency. A gray non-uniformity correction model based on two-point correction method is built, and the way to estimate the degradation function and the restoration process are proposed. Both the experimental results and simulation show that the non-uniformity of the image after correction is less than 1/10 of that of before correction and the relative error between the original image and restored image is 0.56%.