Browse > Article
http://dx.doi.org/10.5573/ieie.2015.52.2.141

Perceptual Contrast based on Distribution of Brightness in CIECAM02 for Mobile Display  

Nam, Eui-Won (School of Electronics Engineering, Kyungpook National University)
Kyung, Wang-Jun (School of Electronics Engineering, Kyungpook National University)
Ha, Ho-Gun (School of Electronics Engineering, Kyungpook National University)
Ha, Yeong-Ho (School of Electronics Engineering, Kyungpook National University)
Publication Information
Journal of the Institute of Electronics and Information Engineers / v.52, no.2, 2015 , pp. 141-147 More about this Journal
Abstract
The contrast of a display is generally evaluated by using the ratio of the minimum luminance to the maximum luminance of the display. However, this contrast ratio is not matched with perceived contrast because it uses only physical characteristic of display without considering human perceptual characteristics. In this paper, the proposed contrast measure that considers perceptually discriminable brightness within the range of display brightness is suggested. First, the range between the minimum and maximum brightness of display in CIECAM02 color space is calculated to measure the length of perceived brightness for the display. Next, brightness ranges which are perceptually same at each brightness level are determined by applying Weber-Fechner ratio and then, the number of brightness values within each brightness range is counted. Finally, perceptually discriminable brightness is defined as the sum of ratio between the number of brightness values in each brightness range and the perceptual contrast length of the display. In the experiments, preference test using various displays with random brightness patches is performed to evaluate perceived contrast. As a result, the proposed measure is more consistent with human perception than the previous contrast measures.
Keywords
Display quality evaluation; mobile display; perceptual contrast;
Citations & Related Records
연도 인용수 순위
  • Reference
1 S.B. Lee, "Emotional Image Quality Evaluation Technology for Display Devices," Korean Institute of Illuminating & Electrical Installation En-gineers, vol. 21, no. 5 pp. 13-20, 2007.
2 S.B. Lee, "Image Quality Technology Issues Using Emotional Image Quality Evaluation Method," KDC 2008, Session B-3, 2008.
3 S.K. Lee, "Trends in Visual Quality Assessment," Electronics and Telecommunications Trends, vol. 27, no. 3, 2012
4 J.H. Chong, "A Study on The Evaluation Method of Perceptual Contrast with CIECAM02," IMID 2007 Digest, pp. 1661-1663, 2007.
5 J.H. Chong, "A Novel Method to Evaluate the Emotional Image Quality with CIECAM02," IMID 2008 Digest, pp. P3-3, 2008.
6 Vienna: Central Bureau of the CIE, "A Color Appearance Model for Color Management Systems : CIECAM02," CIE TC8-01 Technical Report (Draft 11), 2003..
7 Mark D. Fairchild, "Color appearance models," John Wiley & Sons, pp. 265-277, 2005.
8 G. Wyszecki, "Color Science," John Wiley & Sons, pp. 567-572, 1982.
9 J. Morovic, "Color Gamut Maping", Wiley, New York, 2008