OpenCV读入一个图像，然后把图像分为HSV三个平面，把它们的颜色分布画成直方图，在窗口中显示-OpenCV reads an image, then the image is divided into three planes HSV, they painted the color distribution histogram, shown in the window

将一张表格的数据或者一个矩阵，其每个元素的大小映射到一种颜色，从而通过颜色大小直观看出数据分布-A data table or a matrix, the size of each element is mapped to a color, thereby visually see the data of the color or size distribution