opencv 自动打开摄像头 识别圆的方法

本代码 含有 打开摄像头，并获取每一帧的图片句柄 ，按S键 定帧 ，识别图像中的圆。 代码内容简介， 注释到位。

opencv
Debug
ipch
opencv.sdf
opencv.sln
opencv.suo
opencv
Debug
003.jpg
004.jpg
005.jpg
007.jpg
01.jpg
opencv.exe
opencv.ilk
opencv.pdb
pic.jpg
cl.command.1.tlog
CL.read.1.tlog
CL.write.1.tlog
link.4584.read.1.tlog
link.4584.write.1.tlog
link.4584-cvtres.read.1.tlog
link.4584-cvtres.write.1.tlog
link.command.1.tlog
link.read.1.tlog
link.write.1.tlog
link-cvtres.read.1.tlog
link-cvtres.write.1.tlog
mt.command.1.tlog
mt.read.1.tlog
mt.write.1.tlog
opencv.Build.CppClean.log
opencv.exe.embed.manifest
opencv.exe.embed.manifest.res
opencv.exe.intermediate.manifest
opencv.lastbuildstate
opencv.log
opencv.obj
opencv_manifest.rc
rc.command.1.tlog
rc.read.1.tlog
rc.write.1.tlog
vc100.idb
vc100.pdb