Note : OpenCV4.1.2图像处理学习过程中遇到的问题总结

2019/12/19学习笔记

cvtColor()函数是一个颜色空间转换函数，可以实现RGB颜色向HSV，HSI等颜色空间转换，以及转换为灰度图。

cvtColor(src1, srcGray1, CV_RGB2GRAY);
cvtColor(src2, srcGray2, CV_RGB2GRAY);  //转为灰度图

在opencv2版本之前运行成功！

使用最新版本opencv4.1.2时，提示：“CV_RGB2GRAY”: 未声明的标识符。

#include <opencv2/imgproc/types_c.h>//添加该头文件，cvtColor函数运行成功

在更新最新版本之后（OpenCV4.1.2）。无法打开源文件 "opencv2/nonfree/nonfree.hpp"问题！

Changed modules

ml module has been rewritten
highgui module has been split into parts: imgcodecs, videoio and highgui itself
features2d module have been reorganized (some feature detectors has been moved to opencv_contrib/xfeatures2d module)
legacy, nonfree modules have been removed. Some algorithms have been moved to different locations and some have been completely rewritten or removed
CUDA API has been updated (gpu module -> several cuda modules, namespace gpu -> namespace cuda)
OpenCL API has changed (ocl module has been removed, separate ocl:: implementations -> Transparent API)
Some other methods and classes have been relocated

就是将部分算法模块删除或迁移，将很多算法放到了opencv_contrib中，https://github.com/opencv/opencv_contrib

想要使用该部分算法，需要自己opencv_contrib编译到opencv中。以下简单介绍以下opencv在windows下编译的过程。

因为我用的是opencv目前最新版本opencv4.1.2，所以我下载了相对应的版本。

在https://github.com/opencv中下载了 opencv源码opencv4.1.2和opencv-contrib4.1.2。

在cmake官网https://cmake.org/download/上下载了最新版本Cmake3.16.1。

图片为我刚下载好的压缩包。

详细的windows下编译opencv+opencv_contrib教程，参考https://blog.csdn.net/qq_42299461/article/details/103626611

来源：CSDN

作者：璃墟

链接：https://blog.csdn.net/qq_42299461/article/details/103614034

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