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[Keyword] visual gamma(2hit)

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  • Enhanced Depiction of High Dynamic Images Using Tone Mapping Operator and Chromatic Adaptation Transform

    Ho-Hyoung CHOI  Byoung-Ju YUN  

     
    BRIEF PAPER

      Vol:
    E100-C No:11
      Page(s):
    1031-1034

    The problem of reproducing high dynamic range (HDR) images on devices with a restricted dynamic range has gained a lot of interest in the computer graphics community. Various approaches to this issue exist, spanning several research areas, including computer graphics, image processing, color vision, and physiology. However, most of the approaches to the issue have several serious well-known color distortion problems. Accordingly, this article presents a tone-mapping method. The proposed method comprises the tone-mapping operator and the chromatic adaptation transform. The tone-mapping method is combined with linear and non-linear mapping using visual gamma based on contrast sensitive function (CSF) and using key of scene value, where the visual gamma is adopted to automatically control the dynamic range, parameter free, as well as to avoid both the luminance shift and the hue shift in the displayed images. Furthermore, the key of scene value is used to represent whether the scene was subjectively light, norm, dark. The resulting image is then processed through a chromatic adaptation transform and emphasis lies in human visual perception (HVP). The experiment results show that the proposed method yields better performance of the color rendering over the conventional method in subjective and quantitative quality and color reproduction.

  • The Quantitative Model for Optimal Threshold and Gamma of Display Using Brightness Function

    Sung-Hak LEE  Soo-Wook JANG  Eun-Su KIM  Kyu-Ik SOHNG  

     
    LETTER

      Vol:
    E89-A No:6
      Page(s):
    1720-1723

    We investigated physical conditions for optimum display systems on various TV viewing conditions, and found that visual brightness function could be derived from relationships between Steven's power law and Bartleson-Breneman's brightness function, and that the optimum physical contrast ratio and compensated gamma for display system with adaptation luminance level could be obtained from the proposed brightness function.