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运行cv示例stitching.cpp图像拼接器。

参数：

--d3 内部在每个图像上创建三个大块以增加拼接成功率

--mode（全景|扫描）确定拼接器的配置。默认值为'panorama'（全景）模式。扫描适合在仿射变换下缝合材料

--output <result_img> 默认值为'result.jpg'。

用法示例：--d3 --try_use_gpu yes --mode scan left01.jpg left02.jpg \ n“;

left01.jpg

left02.jpg

result.jpg

(扫描模式先1后2)

（全景模式先1后2）

（全景模式先2后1）

（扫描模式先2后1）

D:\Debug>opencv_0.exe  --d3 --mode scans left01.jpg left02.jpg[ INFO:0] global C:\build\master_winpack-build-win64-vc14\opencv\modules\core\src\ocl.cpp (891) cv::ocl::haveOpenCL Initialize OpenCL runtime...
OpenCV(4.2.0) Error: Requested object was not found (could not open directory: C:\Users\PC\AppData\Local\Temp\opencv) in glob_rec, file C:\build\master_winpack-build-win64-vc14\opencv\modules\core\src\glob.cpp, line 267
[ INFO:0] global C:\build\master_winpack-build-win64-vc14\opencv\modules\core\src\ocl.cpp (433) cv::ocl::OpenCLBinaryCacheConfigurator::OpenCLBinaryCacheConfigurator Successfully initialized OpenCL cache directory: C:\Users\PC\AppData\Local\Temp\opencv\4.2\opencl_cache\
[ INFO:0] global C:\build\master_winpack-build-win64-vc14\opencv\modules\core\src\ocl.cpp (457) cv::ocl::OpenCLBinaryCacheConfigurator::prepareCacheDirectoryForContext Preparing OpenCL cache configuration for context: Intel_R__Corporation--Intel_R__HD_Graphics_630--24_20_100_6344
stitching completed successfullyD:\Debug>opencv_0.exe   --d3 --try_use_gpu yes --mode scans left01.jpg left02.jpg
[ WARN:0] global C:\build\master_winpack-build-win64-vc14\opencv\modules\core\src\utils\samples.cpp (59) cv::samples::findFile cv::samples::findFile('--try_use_gpu') => ''
OpenCV(4.2.0) Error: Unspecified error (OpenCV samples: Can't find required data file: --try_use_gpu) in cv::samples::findFile, file C:\build\master_winpack-build-win64-vc14\opencv\modules\core\src\utils\samples.cpp, line 62
OpenCV: terminate handler is called! The last OpenCV error is:
OpenCV(4.2.0) Error: Unspecified error (OpenCV samples: Can't find required data file: --try_use_gpu) in cv::samples::findFile, file C:\build\master_winpack-build-win64-vc14\opencv\modules\core\src\utils\samples.cpp, line 62

看到课堂上其他同学的效果（如下），我意识到我应该输入有点问题，这个应用是找图片中相同的特征进行拼接

新的输入：来自于一张照片的三个不同部分，左中右分别对应原图的中左右，就按这个顺序输入。

不加任何参数：（后更改顺序，输出效果不变）

增加d3参数：变窄了，而且3几乎看不见了，即使改变输入顺序也是如此。。。

opencv中不公开的类：

OpenCV: Non-free 2D Features Algorithms

This section describes two popular algorithms for 2d feature detection, SIFT and SURF, that are known to be patented. You need to set the OPENCV_ENABLE_NONFREE option in cmake to use those. Use them at your own risk.

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