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http://dx.doi.org/10.5909/JBE.2018.23.2.283

Efficient Reverse Tone Mapping Method Using Guided Filter  

Kim, Sang Hyub (School of Information, Communications and Electronics Engineering, The Catholic University of Korea)
Lee, Chang Woo (School of Information, Communications and Electronics Engineering, The Catholic University of Korea)
Publication Information
Journal of Broadcast Engineering / v.23, no.2, 2018 , pp. 283-292 More about this Journal
Abstract
Devices capable of capturing and displaying high dynamic range (HDR) images with significantly increased brightness range compared to low dynamic range (LDR) images have been developed and various methods for efficiently converting the brightness range of an image have been developed. In this paper, we propose a reverse tone mapping method using a guided filter to efficiently convert LDR images into HDR images. After obtaining brightness enhancement function (BEF) using a guided filter, we can reconstruct HDR image from one LDR image. In addition, when the image is too bright or dark, the proposed method maximizes the image quality of the reconstructed HDR image by estimating and adjusting the exposure value before expanding the brightness range of images. Computer simulations show that the proposed method produces HDR images of superior quality compared with the conventional methods.
Keywords
High dynamic range image; reverse tone mapping; guided filter; brightness enhancement function;
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