行间转移大面阵CCD相机的Smear噪声实时去除

Abstract

For the peculiar Smear noise occurred in the area CCD imaging,a method to extract the Smear from the interline transfer CCD dark pixel region was proposed by taking an interline transfer area CCD for an example.The working principle of the area CCD was introduced,the creation reason of the Smear was analyzed and the composition of the Smear noise was discussed.Then,the KTC noise and the dark current noise of the Smear were filtered by using the Correction Double Sample(CDS) and the dumb pixel correction.The average filter method based on a middle value was proposed to eliminate the light shot noise.Finally,the Smear was eliminated from a original image by the subtract method,and the Smear image region was compensated by the triangle-based interpolation.A real-time hardware processing system was designed by using Field Programming Gate Array + Digital Signal Processor(FPGA + DSP) as the core processor.When the camera is working at the fastest working mode 3 frame / s,the Smear can be extract and filtered in 1.265 ms and the gradation variance of the image area has decreased to 95.34% by eliminating the Smear.With the imaging experiment verification,the system has a high integration and real-time ability and the Smear noise is eliminated completely.