Modulation transfer function test method and system based on CCD camera image intensifier

Abstract

The invention provides a modulation transfer function test system based on a CCD camera image intensifier. The test system is formed by a hardware module and a software module. The hardware module comprises a target light source system, an image acquisition system, a CCD shift system, an industrial personal computer and other sub systems. The software module comprises an image acquisition module, a motor control module, an MTF calculation module, a file management module and other sub modules. The collected image information is subjected to clarity judgment, if the image is fuzzy, a CCD camera is controlled through the CCD shift system to move front and back to realize focusing, thus the collected image becomes clearest, at that time the industrial personal computer processes clear image information, the calculation of a modulation transfer function is realized by the MTF calculation module, and through the file management module, a calculated modulation transfer function value is stored. According to the system, the control process is simple, the stability is good, the image can be focused automatically, and the system can be used for the detection of the modulation transfer functions of other photoelectric systems.

Description

technical field [0001] The invention relates to a modulation transfer function testing technology, in particular to a modulation transfer function testing method and system of an image intensifier based on a CCD camera. Background technique [0002] The imaging quality of an optoelectronic system directly affects the clarity of the image that can be observed by the human eye, so it is particularly important to measure the imaging quality of an optoelectronic system. There are many indicators for evaluating the imaging quality of photoelectric systems, mainly including discrimination rate method, star point test and modulation transfer function (MTF) and so on. Since the modulation transfer function quantitatively represents a large amount of image quality information provided by the star point in the form of a function, it also includes the image quality information represented by the discrimination rate, and the modulation transfer function can be directly measured accurate...

AI Technical Summary

Problems solved by technology

In this way, there are many sources of error in the measurement, and the measurement results with high precision make the measurement device complicated and cumbersome.

At present, there are also some imported MTF testers in China. These testers have high precision and fast measurement speed, but they are expensive.

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