Luo Yong, Guan Ye-Peng
Appl Opt. 2015 Apr 1;54(10):2929-38. doi: 10.1364/AO.54.002929.
A structural compensation enhancement method is proposed to resolve the issue of nonuniform illumination image enhancement. A logarithmic histogram equalization transformation (LHET) is developed for improving the contrast of image and adjusting the luminance distribution. A structural map of illumination compensation is produced with a local ambient light estimation filter. The enhanced image is obtained by nonlinearly fusing the LHET result, reflection component, and structural map of illumination compensation. Unlike existing techniques, the proposed method has the ability of two-way adjustment for brightness. Furthermore, the proposed method can effectively enhance the nonuniform illumination images with a balance between visibility and naturalness. Extensive experimental comparisons with some state-of-the-art methods have shown the superior performance of the proposed method.
提出了一种结构补偿增强方法来解决非均匀光照图像增强问题。开发了一种对数直方图均衡变换（LHET）以提高图像对比度并调整亮度分布。利用局部环境光估计滤波器生成光照补偿结构映射图。通过对LHET结果、反射分量和光照补偿结构映射图进行非线性融合来获得增强图像。与现有技术不同，该方法具有亮度双向调整能力。此外，该方法能够在可见性和自然度之间取得平衡，有效增强非均匀光照图像。与一些最新方法进行的大量实验比较表明了该方法的优越性能。
