opencv安装路径以及使用

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已于 2022-11-15 11:34:36 修改

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分类专栏： ubuntu16.04库安装 C++11新特性总结文章标签： c++

于 2022-07-12 22:06:58 首次发布

本文链接：https://blog.youkuaiyun.com/qq_43526137/article/details/125753178

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本文介绍了OpenCV中LK光流的计算原理，包括灰度不变、时间连续小运动和空间一致假设，并探讨了稀疏光流和稠密光流的区别。此外，还讲解了特征追踪、求解PnP问题的解决方法以及triangulatePoints函数的使用。同时，文章提到了访问OpenCV图像像素的三种方式，并简要提及CMake的使用。

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1. opencv各自算法的使用以及原理（杂合版本）

1.1 计算LK光流

官网链接：OpenCV: Object Tracking

1.1.1 光流法的三个基本假设：

（1）灰度不变假设

（2）时间连续小运动假设

（3）空间一致假设（领域内所有像素点的运动一致）

1.1.2 稀疏光流和稠密光流的区别

稀疏光流是只跟踪特征点，稠密光流是跟踪所有像素

1.1.3 关于代码存在的疑问

光流怎么实际应用呢？计算出来之后

输出数据的格式是什么？误差是什么？

1.2 追踪特征

goodFeaturesToTrack函数详细注释_xdfyoga1的博客-优快云博客_goodfeaturestotrack

注意最后一个参数mask，表示尽可能在感兴趣的区域进行特征提取

1.3. 求解PnP问题

cv::solvePnP详解_Amelie_xiao的博客-优快云博客_cv::solvepnp

1.4 triangulatePoints函数

2. 访问像素的三种方法

2.1. ptr (最快)

cv::Mat img;

// 1. 图像是灰度图
uchar value = img.ptr<uchar>(i)[j]; // 获取第i行第j列的像素值
// 2. 图像是RGB图
cv::Vec3b vector = img.ptr<cv::Vec3b>(i)[j];  // 获取第i行第j列的3个通道的像素值
uchar value = img.ptr<cv::Vec3b>(i)[j][0/1/2];

2.2. 迭代器访问

cv::Mat img;

//    图像是rgb图像
it = img.begin<cv::Vec3b>();

(*it)[0/1/2] // 依次获取像素点的通道值
it++

2.3. at访问

cv::Mat img;

//    RGB
img.at<cv::Vec3b>(row,col)[0/1/2]

//    Gray
img.at<uchar>(row, col)

Cmake使用

find_package(OpenCV REQUIRED)
include_directories(${OpenCV_INCLUDE_DIRS})
target_link_libraries(CLionTest ${OpenCV_LIBS})

别看了，我只是为了记住安装路径，好卸载或者多版本兼容

/usr/local/share/licenses/opencv3

/usr/local/include/opencv2

/usr/local/lib/pkgconfig/opencv.pc

/usr/local/share/OpenCV

/usr/local/bin/setup...

/usr/local/share/licemse..

/usr/local/include/opencv/...

 Installing: /usr/local/share/licenses/opencv3/opencl-headers-LICENSE.txt
-- Installing: /usr/local/include/opencv2/cvconfig.h
-- Installing: /usr/local/include/opencv2/opencv_modules.hpp
-- Installing: /usr/local/lib/pkgconfig/opencv.pc
-- Installing: /usr/local/share/OpenCV/OpenCVModules.cmake
-- Installing: /usr/local/share/OpenCV/OpenCVModules-release.cmake
-- Installing: /usr/local/share/OpenCV/OpenCVConfig-version.cmake
-- Installing: /usr/local/share/OpenCV/OpenCVConfig.cmake
-- Installing: /usr/local/bin/setup_vars_opencv3.sh
-- Installing: /usr/local/share/OpenCV/valgrind.supp
-- Installing: /usr/local/share/OpenCV/valgrind_3rdparty.supp
-- Installing: /usr/local/share/licenses/opencv3/libjpeg-turbo-README.md
-- Installing: /usr/local/share/licenses/opencv3/libjpeg-turbo-LICENSE.md
-- Installing: /usr/local/share/licenses/opencv3/libjpeg-turbo-README.ijg
-- Installing: /usr/local/share/licenses/opencv3/libtiff-COPYRIGHT
-- Installing: /usr/local/share/licenses/opencv3/jasper-LICENSE
-- Installing: /usr/local/share/licenses/opencv3/jasper-README
-- Installing: /usr/local/share/licenses/opencv3/jasper-copyright
-- Installing: /usr/local/share/licenses/opencv3/libpng-LICENSE
-- Installing: /usr/local/share/licenses/opencv3/libpng-README
-- Installing: /usr/local/share/licenses/opencv3/openexr-LICENSE
-- Installing: /usr/local/share/licenses/opencv3/openexr-AUTHORS.ilmbase
-- Installing: /usr/local/share/licenses/opencv3/openexr-AUTHORS.openexr
-- Installing: /usr/local/share/licenses/opencv3/protobuf-LICENSE
-- Installing: /usr/local/share/licenses/opencv3/protobuf-README.md
-- Installing: /usr/local/share/licenses/opencv3/quirc-LICENSE
-- Installing: /usr/local/share/licenses/opencv3/ittnotify-LICENSE.BSD
-- Installing: /usr/local/share/licenses/opencv3/ittnotify-LICENSE.GPL
-- Installing: /usr/local/include/opencv/cv.h
-- Installing: /usr/local/include/opencv/cv.hpp
-- Installing: /usr/local/include/opencv/cvaux.h
-- Installing: /usr/local/include/opencv/cvaux.hpp
-- Installing: /usr/local/include/opencv/cvwimage.h
-- Installing: /usr/local/include/opencv/cxcore.h
-- Installing: /usr/local/include/opencv/cxcore.hpp
-- Installing: /usr/local/include/opencv/cxeigen.hpp
-- Installing: /usr/local/include/opencv/cxmisc.h
-- Installing: /usr/local/include/opencv/highgui.h
-- Installing: /usr/local/include/opencv/ml.h
-- Installing: /usr/local/include/opencv2/opencv.hpp
-- Installing: /usr/local/lib/libopencv_core.so.3.4.9
-- Installing: /usr/local/lib/libopencv_core.so.3.4
-- Set runtime path of "/usr/local/lib/libopencv_core.so.3.4.9" to "/usr/local/lib"
-- Installing: /usr/local/lib/libopencv_core.so
-- Installing: /usr/local/include/opencv2/core/opencl/ocl_defs.hpp
-- Installing: /usr/local/include/opencv2/core/opencl/opencl_info.hpp
-- Installing: /usr/local/include/opencv2/core/opencl/opencl_svm.hp

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