Constructing high dynamic range image based on photographs with different amounts of exposure
Zongying Ou · Dalian Ligong Daxue xuebao · 2007
A method of fusing multiple photographs into a high dynamic range image is presented.Based on the assumption of reciprocity,the photographs of the same scene are taken with different amounts of exposure by digital camera.Using the least squares principle and B-spline function,the response curve of imaging process can be recovered,and the mapping relationship between pixel values and exposures is acquired.On the basis of the response curve,a high dynamic range image,in which the pixel values are proportional to the true radiance values in the scene,can be constructed from the multiple photographs.It will cover the entire dynamic range captured by the original photographs,and some details information of high light or black regions in the scene can be made out.The experimental results show that the constructed high dynamic range images are satisfactory.