Modeling and Simulation of a TDI Line Scan Camera

摘要

This paper proposes a model of a TDI line scan camera, The camera geometric model is deduced firstly, which gives a perspective transformation from continuous known objects to a discrete image on the TDI CCD line scan sensor. Then the TDI CCD line scan sensor model is addressed. In order to obtain the model, the TDI CCD line scan sensor is divided into three components, the photodetector, the transfer process and the output stage, which are analyzed and modeled individually. The TDI CCD line scan sensor model describing the mathematical relationship between the light illuminance input and the analog output signal is established by using the theories in optics and electric circuits. The model of the sensor presented in this paper can be used to simulate the real sensor operating at high frequency, which is useful to design and evaluate the electronics of the camera, to develop the virtual CCD camera and to research the methods of enhancing the image quality.