CMake編譯好OpenMVG然後運行tutorial_demo.py，報錯如下:
CleanGraph_KeepLargestBiEdge_Nodes():: => connected Component: 0
Invalid input image graph for global SfM
5. Colorize Structure
The input SfM_Data file "D:\OpenCV_SFM_Dependency\openMVG\build\software\SfM\tutorial_out\reconstruction_global/sfm_data.bin" cannot be read.
4. Structure from Known Poses (robust triangulation)
Compute Structure from the provided poses
The input SfM_Data file "D:\OpenCV_SFM_Dependency\openMVG\build\software\SfM\tutorial_out\reconstruction_global/sfm_data.bin" cannot be read.
問題是我們沒有設置相機焦距參數，需要修改一下tutorial_demo.py的這部分代碼：
修改前：
pIntrisics = subprocess.Popen( [os.path.join(OPENMVG_SFM_BIN, "openMVG_main_SfMInit_ImageListing"),
"-i", input_dir, "-o", matches_dir, "-d", camera_file_params, "-c", "3"] )
修改後：
pIntrisics = subprocess.Popen( [os.path.join(OPENMVG_SFM_BIN, "openMVG_main_SfMInit_ImageListing"), "-i", input_dir,\
"-o", matches_dir, "-d", camera_file_params, "-f", "1228.8"]);
注意這裏焦距f的設置github說明 f = max(Width, Height) * 1.2，也就是圖像寬高中的最大值乘以1.2，我的圖像寬高是1024*768，
所以1024 * 1.2 = 1228.8
更改之後，設置直接的重建圖片路徑，就可以生成sfm_data.bin，接下來就參考這篇文章繼續往下做吧https://blog.csdn.net/X_kh_2001/article/details/83690094
https://github.com/cdcseacave/openMVS/wiki/Usage
