资 源 简 介
The enhancement of image contrast and preservation of image brightness are two important but conflicting objectives in
image restoration. Previous attempts based on linear histogram equalization had achieved contrast enhancement, but exact
preservation of brightness was not accomplished. A new perspective is taken here to provide balanced performance of
contrast enhancement and brightness preservation simultaneously by casting the quest of such solution to an optimization
problem. Specifically, the non-linear gamma correction method is adopted to enhance the contrast, while a weighted sum
approach is employed for brightness preservation. In addition, the efficient golden search algorithm is exploited to
determine the required optimal parameters to produce the enhanced images. Experiments are conducted on natural colour
images captured under various indoor, outdoor and illumination conditions. Results have shown that the proposed method
