Research on Noise Testing and Reduction of Low Illumination Imaging　module

摘要

As the rapid development of back-illuminated CMOS (BI-CMOS) image sensor technology in recent years, itsapplication prospect in the field of Low-Light-Level (LLL) night vision has been widely concerned. Therefore, LLLimaging module was developed based on BICMOS, whose 3-D noise data was obtained under different illuminationconditions. The test results show that, the signal-to-noise ratio (SNR) of imaging module becomes worse with thedecreasing of illumination. According to the judgement of noise, the noise power of the image in low illumination ismainly Gaussian distribution. And the image processed by spatial filtering, which efficiently reducing the imaging noiseand improving the imaging quality.