Research On Matching Method Of Dynamic Range Of Scene And Imaging System

Aerospace remote sensing technology has been widely applied in people’s life, production and scientific research. With the rapid development of modern science and technology, aerospace remote sensing becomes higher and higher resolution, the level is also more and more small. TDI CCD with time delay integral scanning mode can increase scan sensitivity of the linear array CCD sensor. And it can improve the imaging signal to noise ratio, which has been widely used in aerospace remote sensing. But the difficulty of metering process is always a problem. In this paper, from the point of view of measuring scene dynamic range and matching, a method is proposed for the space remote sensing.This paper is mainly composed of matching of dynamic range of scene, dynamic range measurement of HDR photo and the test of dynamic range matching.Firstly, this paper describes the principle of dynamic range of imaging system and dynamic range of scene. From the single pixel of the photogene rated charge theory, relative irradiance is definite which provides the theory basis for matching the scene dynamic range.Secondly, this paper uses several frames to obtain the dynamic range of the scene. the Image motion compensation scheme is used to solve the influence of the movement of carrier on shooting. HDR image is get according to the dynamic range of the scene. And then the HDR image is used to compare with the matching photo to determine whether matching image is effective.Finally, the experiment platform of dynamic range matching is built to validate the matching of dynamic range of the scene. The experimental results show that the matching scheme of the dynamic range scene is feasible and effective.