Based On The The Birefringence Olpf Features And Test System Study

Optical Low Pass Filter (OLPF), is widely used in the digital imaging device, e.g. digital video cameras, digital video monitor, camcorder.In this thesis, Opto-electric imaging system is a discrete imaging system, Sampling of photoelectric imaging system can infinitely replicate the scene spectrum in spectrum space, And If the sampling intervals are too large to satisfy the Nyquist criterion, the replicas overlap, and there is aliasing. Morie fringe appears in image. The quality of image is receded . In this thesis, it is also discussed in detail that OLPF which is based upon the light-splitting character of birefringent crystal can reduce aliasing in a digitized image.Optical system is a space-filter by Fourier Optics. Optical Transfer Function (OTF) can evaluate the frequency characteristics of a optical system or device. Analytical method of optic transfer function is employed to OLPF in the paper. By this way, the amplitude frequency response characteristics of OLPF in one dimension and two dimensions are presented.We developed an OLPF recognition system, named as Double Refractive Pattern Recognition System for OLPF. The principle and structure of the system is introduced in this paper. The system, with high precision and large-scale detection, can measure the thickness and angles between optical axes accurately and quickly. In addition, the system has a good compatibility, i.e. standard microscope objective can substitute the digital microscope adapter, which is specially designed for the system. The software of the system is also very powerful: in addition to the basic function image caption and scan, it can automatically detect the light spots number, distance and angles between light spots.