OpenCv计算直方图cv::calcHist
直方图，简单通俗的理解，是对图像上像素的统计！统计像素在整个图像上的出现频率！OpenCv提供的API中有三个计算直方图的函数：/** @brief Calculates a histogram of a set of arrays.The functions calcHist calculate the histogram of one or more arrays. The
