OpenCv计算直方图cv::calcHist

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我是靠谱客的博主调皮哈密瓜，这篇文章主要介绍OpenCv计算直方图cv::calcHist，现在分享给大家，希望可以做个参考。

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 elements of a tuple used
to increment a histogram bin are taken from the corresponding input arrays at the same location. The
sample below shows how to compute a 2D Hue-Saturation histogram for a color image.
**/
CV_EXPORTS void calcHist( const Mat* images, int nimages, 
                          const int* channels, InputArray mask, 
                          OutputArray hist, int dims, const int* histSize, 
                          const float** ranges, bool uniform = true, bool accumulate = false );
                          
/** @overloadthis variant uses cv::SparseMat for output*/
CV_EXPORTS void calcHist( const Mat* images, int nimages, 
                          const int* channels, InputArray mask, 
                          SparseMat& hist, int dims, const int* histSize, 
                          const float** ranges, bool uniform = true, bool accumulate = false );
                          
/** @overload */
CV_EXPORTS_W void calcHist( InputArrayOfArrays images, 
                          const std::vector& channels, InputArray mask, 
                          OutputArray hist, const std::vector& histSize, 
                          const std::vector& ranges, bool accumulate = false );

参考文献：

[1] OpenCV深入学习(5)--直方图之calcHist使用

[2] OpenCV深入学习(6)--直方图之calcHist使用（补）