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Journal of Information Science and Engineering, Vol. 31 No. 3, pp. 1011-1026 (May 2015)


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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Received October 25, 2013; revised January 14 & April 14, 2014; accepted May 14, 2014.
Communicated by Chang-Shing Lee.
* This work was supported in part by the National Science Council of Taiwan under Grant NSC-101-2221-E-006-151-MY3, by the Ministry of Economic Affairs (MOEA) of Taiwan under Grant MOEA 102-EC-17-A- 05-S1-192, and by the Headquarters of University Advancement at National Cheng Kung University, which is sponsored by the Ministry of Education, Taiwan.