MTF Measurement Of CCD Digital Camera

Modulation Transfer Function (MTF), which is the spatial frequency response of imaging systems,is an important parameter to evaluate the imaging quality of the digital camera. With MTF measuring demand of a micro-satellite CCD camera in the practical project, MTF measurement technical of CCD Digital Camera is deeply researched in this paper.When grating target is used to measure the MTF of the digital camera, the test result is uncertain because of the inevitable registration error between the image of the target and CCD pixel. Slanted-edge method, which can increase the sampling frequency and reduce the effect of the registration error, is used to measure the MTF of the camera.The main research contents of paper are as follows:In the first chapter we illustrate the significance of measuring the MTF of a CCD camera system, introduce the development history of modulation transfer function, and introduce the characteristics of CCD camera system.The second chapter introduces the basic theory of MTF, and we analyze the MTF of each component of the CCD camera system.The third chapter outlines the MTF measurement methods of the CCD camera system, which is focused on the slanted knife-edge measurement method and its algorithm and software, we analyze the affect of the alignment between the CCD pixels and the input pattern to the modulation transfer function.The fourth chapter describes validation experiment for slanted knife-edge measurement method and applies it to MTF measurement of a micro-satellite CCD camera. Test results are analyzed. The fifth chapter summarizes research results, pointing out the further research and problems need to be solved.