Research of digital MTF test system based on CCD

Lihong Yang; Guobin Sun; Weihong Ma; Zhen Huang

doi:10.1117/12.782912

14 November 2007 Research of digital MTF test system based on CCD

Lihong Yang, Guobin Sun, Weihong Ma, Zhen Huang

Proceedings Volume 6722, 3rd International Symposium on Advanced Optical Manufacturing and Testing Technologies: Advanced Optical Manufacturing Technologies; 67220Y (2007) https://doi.org/10.1117/12.782912
Event: 3rd International Symposium on Advanced Optical Manufacturing and Testing Technologies: Large Mirrors and Telescopes, 2007, Chengdu, China

Abstract

A novel measurement system of digital optical modulation transfer function based on CCD is introduced. This system is mainly made of slight source , collimator, detected system, magnify object lens set, CCD, image collect card ,computer and so on. Different algorithms are proposed for two different sighting vanes of the pinhole and the slit. For pinhole sighting vane, three levels of wavelet transformation algorithm are used to denoise, and by the relation of initial point spread function and line spread function, two-dimensional pinhole image transforms two vertical direction line spread functions. Through the algorithms of Fourier transform, the test can be realized. Slit sighting vane adopts the cubic fitting interpolation algorithm to smooth the curve, and Fourier transform to realize the test. The normalized way is used to process data for the two sighting vane algorithm results. Different model photography lenses are separately measured on the test system. It is showed by the test result that the denoised signals for the pinhole sighting vane are quite smooth through three levels of wavelet transform algorithms, and the point spread function transforms to two vertical-directional line proliferation functions, which makes the Fourier frequency spectrum transform simple; and it has better effect for the slit sighting vane to employ the cubic fitting interpolation algorithm to smooth the curve. MTF test precision is 0.04mm on axis and 0.08mm out of axis.

Citation Download Citation

Lihong Yang, Guobin Sun, Weihong Ma, and Zhen Huang "Research of digital MTF test system based on CCD", Proc. SPIE 6722, 3rd International Symposium on Advanced Optical Manufacturing and Testing Technologies: Advanced Optical Manufacturing Technologies, 67220Y (14 November 2007); https://doi.org/10.1117/12.782912

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KEYWORDS

Modulation transfer functions

Wavelets

Charge-coupled devices

Point spread functions

Interference (communication)

Image processing

Optical transfer functions

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