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Proceedings Paper

A real-time automatic contrast adjustment method for high-bit-depth cameras based on histogram variance analysis
Author(s): Jun Zhao; Jun Lu
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Paper Abstract

In this paper we propose an efficient method to enhance contrast in real time in digital video streams by exploiting histogram variances and adaptively adjusting gamma curves. The proposed method aims to overcome the limitations of the conventional histogram equalization method, which often produces noisy, unrealistic effects in images. To improve visual quality, we use gamma correction technique and choose different gamma curves according to the histogram variance of the images. By using this scheme, the details of an image can be enhanced while the mean brightness level is kept. Experiment results demonstrate that our method is simple and efficient, and robust for both low and high dynamic scenes, and hence well suited for real-time, high-bit-depth video acquisitions.

Paper Details

Date Published: 8 October 2015
PDF: 8 pages
Proc. SPIE 9675, AOPC 2015: Image Processing and Analysis, 96752W (8 October 2015); doi: 10.1117/12.2202817
Show Author Affiliations
Jun Zhao, Zhejiang Univ. (China)
Jun Lu, Zhejiang Univ. (China)


Published in SPIE Proceedings Vol. 9675:
AOPC 2015: Image Processing and Analysis
Chunhua Shen; Weiping Yang; Honghai Liu, Editor(s)

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