Opencv_画基本几何图形&查看图像灰度直方图

几何图形绘制

https://blog.csdn.net/lql0716/article/details/54980921

官方文档位置

https://docs.opencv.org/2.4.13.2/modules/core/doc/drawing_functions.html#void%20ellipse%28Mat&%20img,%20Point%20center,%20Size%20axes,%20double%20angle,%20double%20startAngle,%20double%20endAngle,%20const%20Scalar&%20color,%20int%20thickness,%20int%20lineType,%20int%20shift%29

查看图像灰度直方图

https://www.cnblogs.com/wangguchangqing/p/7098213.html

matlab查看图像直方图（可以获得数据）

https://blog.csdn.net/weixin_44491423/article/details/110160022