JISE


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Journal of Information Science and Engineering, Vol. 31 No. 3, pp. 1011-1026


A Weighted Edge-Preserving Smooth Filter for High Dynamic Range Image Display

PEI-YIN CHEN1, YEU-HORNG SHIAU+, HUNG-YU YANG1 AND WAN-YU JHUANG1 
1Department of Computer Science and Information Engineering 
National Cheng Kung University 
Tainan, 701 Taiwan 
+Department of Electrical Engineering 
National Yunlin University of Science and Technology 
Yunlin, 640 Taiwan 
E-mail: pychen@csie.ncku.edu.tw; shiauyh@yuntech.edu.tw; 
yang.hungyu@gmail.com; wyj20s@gmail.com

    Showing high dynamic range images on general displayers whose dynamic ranges are relatively low will result in images with undesirable artifacts such as underexposure or overexposure images. To display images without unwanted artifacts, a Retinex-based tone mapping method is proposed in this paper. We present the weighted edge-preserving smooth filter to estimate a smoother illumination, and a mixed tone mapping function is employed to adjust the illumination component to obtain a more pleasing image. The experimental results demonstrate that our method achieves higher contrast and richer details as compared with previous mapping methods.

Keywords: high dynamic range display, tone mapping, contrast enhancement, edge-preserving smooth filter, Retinex theory

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