See Zi Siang and  Khairul Hazrin Hashim and  Harold Thwaites and  Lee Xia Sheng and  Ooi Wooi Har,  Retrieving Extended High Dynamic Range from Digital Negative Image - An Experiment on Architectural Photo Imaging.   journal   = {International Journal of Computer and Information Engineering}, [online]. World Academy of Science, Engineering and Technology.
    August 2012, vol. 68(8). 1061 - 1069
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