Method of Auto Multi-Exposure for High Dynamic Range Imaging
This paper proposes a method for calculating the multi-exposure times fast and accurately when the scene has a high dynamic range, minimizing the pictures needed to take and improving the dynamic range of the CCD system. The proposed method first measures the cameras response function referring 10. After that the median value of the output picture is adjusted to be in the middle range of the system output by changing the exposure time. It can be inferred from the histogram of the current picture whether its a high dynamic range scene by calculating the number of pixels under exposed and over exposed. Once again the under and over exposed pixels are adjusted to be in the middle according to the cameras response function. Finally different exposed pictures (2 or 3) are fused together by Gaussian function and the dynamic range is compressed by γ correction. Experimental results on UNIQ-UM400 analog camera and a digital acquisition system show that the algorithm works well and solve the problem of low dynamic range of CCD camera.
auto exposure multi-exposure high dynanic range imaging median value response function
Yongjie Piao Wei Xu Yongjie Piao
Changchun Institute of Optics,Fine Mechanics and Physics,Chinese Academy of Sciences Changchun,China Graduate University of Chinese Academy of Sciences Changchun,China
国际会议
长春
英文
93-97
2010-08-24（万方平台首次上网日期，不代表论文的发表时间）