Abstract
Contrast enhancement plays an important role in palm vein image processing applications. However, the over enhancement of noise the commonly used enhancement method produces in relatively homogeneous regions is still a challenging problem. This paper proposes a low-complexity gray-level transformation method for this contrast enhancement problem. Firstly, we calculate a grid size based on the image’s dimension and extract the high frequency from each patch as a weighting matrix. Then we construct a Gaussian model to express the expected contrast-stretching ratio based on the analysis of patch’s high-frequency distribution. Finally, we use the intensity of each pixel as an index to find its mapping at the four closest neighboring grid points and then interpolate among these values to get the gray scale transformation. Experimental results for some of the widely accepted criterions demonstrate its superiority to the conventional contrast enhancement techniques in enhancement performance and anti-noise capability.
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Acknowledgements
This work was supported by the Special Scientific Research Fund of Meteorological Public Welfare Profession of China (No. GYHY201106002-03), the Fundamental Research Funds for the Central Universities of China (No. JB140315), National Natural Science Foundation of China No. 31401285 and No. 61475163, the National Natural Science Foundation of Anhui No. 1508085QC65 and No. 1608085QF127.
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Sun, X., Ma, X., Wang, C., Zu, Z., Zheng, S., Zeng, X. (2017). An Adaptive Contrast Enhancement Method for Palm Vein Image. In: Zhou, J., et al. Biometric Recognition. CCBR 2017. Lecture Notes in Computer Science(), vol 10568. Springer, Cham. https://doi.org/10.1007/978-3-319-69923-3_26
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DOI: https://doi.org/10.1007/978-3-319-69923-3_26
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