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Volume: 16 | Article ID: art00065_2
Gamma Transformation by Sigmoid Function in Digital Camera System
  DOI :  10.2352/ISSN.2169-4451.2000.16.1.art00065_2  Published OnlineJanuary 2000

In a imaging system such as digital still camera, gamma transformation is important, because of the difference of dynamic range between natural scene and printer. We propose gamma transformation by sigmoid function adjusted by the peak position of histogram of lightness level. It is confirmed that the sigmoid transformation increases the clearness of image.

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Takashi Watanabe, Yasushi Hoshino, "Gamma Transformation by Sigmoid Function in Digital Camera Systemin Proc. IS&T Int'l Conf. on Digital Printing Technologies (NIP16),  2000,  pp 678 - 681,

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