highgui模块中常用函数源码

highgui模块中常用函数源码

其头文件：highgui.hpp

其中源文件

1、imread()函数

原型：CV_EXPORTS_W Mat imread( const string& filename, intflags=1 );

源代码：

Mat imread( const string& filename, int flags ){    Mat img;    imread_( filename, flags, LOAD_MAT, &img );    return img;}

其中imread_定义如下：

static void*imread_( const string& filename, int flags, int hdrtype, Mat* mat=0 ){    IplImage* image = 0;    CvMat *matrix = 0;    Mat temp, *data = &temp;    ImageDecoder decoder = findDecoder(filename);    if( decoder.empty() )        return 0;    decoder->setSource(filename);    if( !decoder->readHeader() )        return 0;    CvSize size;    size.width = decoder->width();    size.height = decoder->height();    int type = decoder->type();    if( flags != -1 )    {        if( (flags & CV_LOAD_IMAGE_ANYDEPTH) == 0 )            type = CV_MAKETYPE(CV_8U, CV_MAT_CN(type));        if( (flags & CV_LOAD_IMAGE_COLOR) != 0 ||           ((flags & CV_LOAD_IMAGE_ANYCOLOR) != 0 && CV_MAT_CN(type) > 1) )            type = CV_MAKETYPE(CV_MAT_DEPTH(type), 3);        else            type = CV_MAKETYPE(CV_MAT_DEPTH(type), 1);    }    if( hdrtype == LOAD_CVMAT || hdrtype == LOAD_MAT )    {        if( hdrtype == LOAD_CVMAT )        {            matrix = cvCreateMat( size.height, size.width, type );            temp = cvarrToMat(matrix);        }        else        {            mat->create( size.height, size.width, type );            data = mat;        }    }    else    {        image = cvCreateImage( size, cvIplDepth(type), CV_MAT_CN(type) );        temp = cvarrToMat(image);    }    if( !decoder->readData( *data ))    {        cvReleaseImage( &image );        cvReleaseMat( &matrix );        if( mat )            mat->release();        return 0;    }    return hdrtype == LOAD_CVMAT ? (void*)matrix :        hdrtype == LOAD_IMAGE ? (void*)image : (void*)mat;}

2、imwrite()函数

原型：CV_EXPORTS_W boolimwrite(const string&filename, InputArrayimg,const vector<int>&params=vector<int>());

源代码：

bool imwrite( const string& filename, InputArray _img,const vector<int>& params ){    Mat img = _img.getMat();    return imwrite_(filename, img, params, false);}static bool imwrite_( const string& filename, const Mat& image,                      const vector<int>& params, bool flipv ){    Mat temp;    const Mat* pimage = &image;    CV_Assert( image.channels() == 1 || image.channels() == 3 || image.channels() == 4 );    ImageEncoder encoder = findEncoder( filename );    if( encoder.empty() )        CV_Error( CV_StsError, "could not find a writer for the specified extension" );    if( !encoder->isFormatSupported(image.depth()) )    {        CV_Assert( encoder->isFormatSupported(CV_8U) );        image.convertTo( temp, CV_8U );        pimage = &temp;    }    if( flipv )    {        flip(*pimage, temp, 0);        pimage = &temp;    }    encoder->setDestination( filename );    bool code = encoder->write( *pimage, params );    //CV_Assert( code );    return code;}

3、imshow()函数

原型：CV_EXPORTS_W void imshow(const string&winname, InputArraymat);

源代码：

void cv::imshow( const string& winname, InputArray _img ){    const Size size = _img.size();#ifndef HAVE_OPENGL    CV_Assert(size.width>0 && size.height>0);    {        Mat img = _img.getMat();        CvMat c_img = img;        cvShowImage(winname.c_str(), &c_img);    }#else    const double useGl = getWindowProperty(winname, WND_PROP_OPENGL);    CV_Assert(size.width>0 && size.height>0);    if (useGl <= 0)    {        Mat img = _img.getMat();        CvMat c_img = img;        cvShowImage(winname.c_str(), &c_img);    }    else    {        const double autoSize = getWindowProperty(winname, WND_PROP_AUTOSIZE);        if (autoSize > 0)        {            resizeWindow(winname, size.width, size.height);        }        setOpenGlContext(winname);        if (_img.kind() == _InputArray::OPENGL_TEXTURE)        {            cv::ogl::Texture2D& tex = wndTexs[winname];            tex = _img.getOGlTexture2D();            tex.setAutoRelease(false);            setOpenGlDrawCallback(winname, glDrawTextureCallback, &tex);        }        else        {            cv::ogl::Texture2D& tex = ownWndTexs[winname];            if (_img.kind() == _InputArray::GPU_MAT)            {                cv::ogl::Buffer& buf = ownWndBufs[winname];                buf.copyFrom(_img);                buf.setAutoRelease(false);                tex.copyFrom(buf);                tex.setAutoRelease(false);            }            else            {                tex.copyFrom(_img);            }            tex.setAutoRelease(false);            setOpenGlDrawCallback(winname, glDrawTextureCallback, &tex);        }        updateWindow(winname);    }#endif}

4、waitKey()函数

原型：CV_EXPORTS_W int waitKey(int delay = 0);

源代码：

int cv::waitKey(int delay){    return cvWaitKey(delay);}CV_IMPL int cvWaitKey( int ){    CV_NO_GUI_ERROR( "cvWaitKey" );    return -1;}#define CV_NO_GUI_ERROR(funcname) \    cvError( CV_StsError, funcname, \    "The function is not implemented. " \    "Rebuild the library with Windows, GTK+ 2.x or Carbon support. "\    "If you are on Ubuntu or Debian, install libgtk2.0-dev and pkg-config, then re-run cmake or configure script", \    __FILE__, __LINE__ )

5、namedWindow()函数

原型：CV_EXPORTS_W void namedWindow(const string&winname, intflags= WINDOW_AUTOSIZE);

源代码：

void cv::namedWindow( const string& winname, int flags ){    cvNamedWindow( winname.c_str(), flags );}CV_IMPL int cvNamedWindow( const char*, int ){    CV_NO_GUI_ERROR("cvNamedWindow");    return -1;}

6、创建滚动条

原型：

（1）typedef void (*MouseCallback)(int event, int x, int y, int flags, void* userdata);//! assigns callback for mouse events

（2）typedef void (CV_CDECL *TrackbarCallback)(int pos, void* userdata);（3）CV_EXPORTS int createTrackbar(const string& trackbarname, const string& winname,                              int* value, int count,                              TrackbarCallback onChange = 0,                              void* userdata = 0);

（4）CV_EXPORTS_W int getTrackbarPos(const string& trackbarname, const string& winname);

（5）CV_EXPORTS_W void setTrackbarPos(const string& trackbarname, const string& winname, int pos);

源代码：

int cv::createTrackbar(const string& trackbarName, const string& winName,                   int* value, int count, TrackbarCallback callback,                   void* userdata){    return cvCreateTrackbar2(trackbarName.c_str(), winName.c_str(),                             value, count, callback, userdata);}void cv::setTrackbarPos( const string& trackbarName, const string& winName, int value ){    cvSetTrackbarPos(trackbarName.c_str(), winName.c_str(), value );}int cv::getTrackbarPos( const string& trackbarName, const string& winName ){    return cvGetTrackbarPos(trackbarName.c_str(), winName.c_str());}

7、鼠标操作

CV_EXPORTS void setMouseCallback(const string& winname, MouseCallback onMouse, void* userdata = 0);
void cv::setMouseCallback( const string& windowName, MouseCallback onMouse, void* param){    cvSetMouseCallback(windowName.c_str(), onMouse, param);}