OLPF installed in the array optical imaging devices (such as CCD, CMOS) front, above the optical imaging device to eliminate the sampling spatial frequency components of the imaging object beam interference. As the CCD, CMOS light sensing element is taken as a non-continuous way, so there are fine lines will take unnecessary noise, optical low-pass filter chip that is provided to eliminate this noise function. Fine lines due to the different needs of the direction of the angle with the corresponding low-pass filter to remove the chip, because of the different models CCD, CMOS optical sensor components are some differences in specifications for different models and taking into account the different directions of the low-pass effect, need to use different cutting angles (such as 45 degrees, 0 degrees, 90 degrees), number of pieces, thickness and IR CUT combined into a low-pass filter chip design, in order to remove noise caused by shooting. In the use of CCD, CMOS optical sensor components take a color scene, because of CCD, CMOS color response of the human eye with different light sensing element must be detected and the human eye can not detect the infrared part of the removal, while Adjust the visible range of the color reaction, so that the color line image showing the feeling of the human eye, so low-pass filter on the chip surface coated IR (AR) CUT (interference type) or with glass (absorption) to use