OpenCV官方示例

　　OpenCV作為一個在全球使用人數眾多的計算機視覺庫，官方已經準備了大量的示例程式，供大家學習。官方提供的示例程式碼具體位於…\opencv\sources\samples目錄下，如下圖所示：

　　通過觀察檔名不難發現，OpenCV官方提供了Android、C、C++、GPU、Python等眾多版本的示例程式。而名為cpp的資料夾則存放著新版本的C++示例程式。

如何執行官方示例

　　在目錄…\opencv\sources\samples下，我們發現CMakeLists.txt，可以用CMake工具生成Visual Studio解決方案。

第一次配置時，會報以下錯誤：

CMake Error at CMakeLists.txt:55 (find_package):
By not providing "FindOpenCV.cmake" in CMAKE_MODULE_PATH this project has
asked CMake to find a package configuration file provided by "OpenCV", but
CMake did not find one.

Could not find a package configuration file provided by "OpenCV" with any
 

of the following names:

OpenCVConfig.cmake
opencv-config.cmake

Add the installation prefix of "OpenCV" to CMAKE_PREFIX_PATH or set
"OpenCV_DIR" to a directory containing one of the above files. If "OpenCV"
provides a separate development package or SDK, be sure it has been
installed.

根據錯誤資訊，我們給OpenCV_DIR項，設定包括OpenCVConfig.cmake和
opencv-config.cmake兩個檔案的目錄，即…\opencv\build。如下圖：

執行結果：