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Brightness preserving image enhancement based on a gradient and intensity histogram

[+] Author Affiliations
Zebin Sun, Wenquan Feng, Qi Zhao, Lidong Huang

Beihang University, School of Electronic and Information Engineering, Xueyuan Road 37, Haidian District, Beijing 100191, China

J. Electron. Imaging. 24(5), 053006 (Sep 10, 2015). doi:10.1117/1.JEI.24.5.053006
History: Received January 12, 2015; Accepted August 10, 2015
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Abstract.  We present a straightforward brightness preserving image enhancement technique. The proposed method is based on an original gradient and intensity histogram (GIH) which contains both gradient and intensity information of the image. This character enables GIH to avoid high peaks in the traditional intensity histogram and, thus alleviate overenhancement in our enhancement method, i.e., gradient and intensity histogram equalization (GIHE). GIHE can also enhance the gradient strength of an image, which is good for improving the subjective quality since the human vision system is more sensitive to the gradient than the absolute intensity of image. Considering that brightness preservation and dynamic range compression are highly demanded in consumer electronics, we manipulate the intensity of the enhanced image appropriately by amplifying the small intensities and attenuating the large intensities, respectively, using a brightness preserving function (BPF). The BPF is straightforward and universal and can be used in other image enhancement techniques. We demonstrate that the proposed method can effectively improve the subjective quality as well as preserve the brightness of the input image.

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Citation

Zebin Sun ; Wenquan Feng ; Qi Zhao and Lidong Huang
"Brightness preserving image enhancement based on a gradient and intensity histogram", J. Electron. Imaging. 24(5), 053006 (Sep 10, 2015). ; http://dx.doi.org/10.1117/1.JEI.24.5.053006


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