色调映射实现，用一张图像的内容拟合另一张图像的色调分布曲线，基于颜色直方图统计进行最佳适配实现-Tone mapping implementation, the content of an image with another image of the color fitting distribution curves were based on color histogram to achieve the best fit

利用OpenCV的库，对图像进行统计直方图的变换，将一幅图像的色调移到另一幅图上，一个简单的图像融合demo-Using OpenCV library, the image histogram of transformation, a move to another tone of an image on a diagram, a simple image fusion demo