为了方便地对可见光镜头进行调制传递函数的测试以及打破国外的垄断，研制了一套体积小重量轻的便携式调制传递函数测试仪。该测试仪以圆孔作为目标物，它发出的光经平行光管准直后，再经过被测镜头，并在被测镜头像面上形成圆孔像，该像经显微物镜放大后被电荷耦合器件(CCD)接收并传入计算机，计算机对图像进行处理和计算，得到调制传递函数值。介绍了图像处理的过程，详细给出了调制传递函数的算法，对测试系统各组件的影响进行了分析与校正，并提出了误差和噪声的抑制方法。将该测试仪的测试结果与光学设计的理论值进行了比较，得到该测试仪的绝对精度为0.018，满足0.03的要求，达到了研制目的。

In order to measure modulation transfer function of visible light lenses conveniently and break the monopoly of foreign countries, a small and light and portable modulation transfer function tester is developed. The tester takes pinhole as target. The light from pinhole is collimated by collimator, and then passes through the lens under test, and forms the pinhole′s image on the image plane of the lens under test. This image is magnified by microscope and received by charge coupled device(CCD) and given to computer. The computer processes the image and calculates the modulation transfer function. The image processing procedure is introduced. The algorithm of modulation transfer function is provided in detail. The influence of components of the test system is analyzed and corrected. The method of restraining error and noise is proposed. This tester′ s results are compared with the theoretical values. It indicates that the absolute accuracy is 0.018, which satisfies the demand of 0.03 and achieves the research purpose.