近期在研究OpenCv對攝像頭的調(diào)用。現(xiàn)將代碼貼出，供大家批評指正。

1、申明

#include"./opencv2/opencv.hpp"#ifdef _DEBUG#pragma comment(lib,"opencv_core249d.lib") #pragma comment(lib,"opencv_highgui249d.lib")#else#pragma comment(lib,"opencv_core249.lib") #pragma comment(lib,"opencv_highgui249.lib")#endifusing namespace cv;class COpencvCameraCtrl :public CCameraBase { public:VideoCapture vc; public:COpencvCameraCtrl(void);~COpencvCameraCtrl(void);public:BOOL OpenCamera( HWND win, CString strVid, CString strPid ); //打開攝像頭BOOL PhotoPic( CString strSaveFile );void CloseCamera(); };

2、打開攝像頭

//打開攝像頭 BOOL COpencvCameraCtrl::OpenCamera(HWND win, CString strVid, CString strPid) {InitCameraWin( win );vid = strVid;pid = strPid;nIndex = GetCameraIndexInOs( vid, pid );if( nIndex < 0 ){return FALSE;}if( !vc.open( nIndex ) ){return FALSE;}vc.set( CV_CAP_PROP_FRAME_WIDTH, nWidth );vc.set( CV_CAP_PROP_FRAME_HEIGHT, nHight ); if( !vc.isOpened() ){bOpen = false;return FALSE;}bOpen = true; return TRUE; }

3、關(guān)閉攝像頭

//關(guān)閉攝像頭 void COpencvCameraCtrl::CloseCamera() {if( vc.isOpened() ){vc.release();} }

4、拍照而且保存到本地

//拍攝攝像頭 BOOL COpencvCameraCtrl::PhotoPic( CString strSaveFile ) {Mat frame;vc >> frame;vc >> frame;if( !frame.data ){return FALSE;}//設(shè)置圖像質(zhì)量vector<int> compression_params;compression_params.push_back( IMWRITE_JPEG_QUALITY );compression_params.push_back( 75 );imwrite( strSaveFile.GetBuffer(0), frame, compression_params );strSaveFile.ReleaseBuffer(); return TRUE; }

須要說明的是：每次從攝像頭獲取數(shù)據(jù)到Mat，須要運行兩次

Mat frame;vc >> frame;vc >> frame;if( !frame.data ){return FALSE;}
假設(shè)只運行一次，會出現(xiàn)兩個問題：

A、假設(shè)打開攝像頭馬上調(diào)用拍照保存，第一次會失敗，獲取不到數(shù)據(jù)

B、每次拍攝保存的圖片是上一次的圖片

總結(jié)

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