Modeling and simulation of a tdi line scan camera

Abstract

mThis paperproposes 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 fhe T D I CCD line scan sensor. Then the T D I CCD line scan sensor model is addressed' I n order IO obfain the model, the T D I CCD line scan sensor is divided into fhree components, thephotodefector, the transferprocess and the output stage, which are analyzed and modeled individually. The T D I CCD line scan sensor model describing the mathematical relationship between the light illuminance input and the analog output signal is esfablished by using fhe fheories in optics and electric circuits. The model of the sensorpresented in thispaper can be used to simulate the real sensor operating at high frequency, which is useful to design and evaluafe the electronics of the camera, to develop the virtual CCD camera and to research the methods af enhancing the image qua&.