OpenCV 的 GrabCut 可运行代码 及实例
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OpenCV中 GrabCut 的可运行代码
参考:http://www.cnblogs.com/tornadomeet/archive/2012/11/09/2763271.html
#include "opencv2/highgui/highgui.hpp"#include "opencv2/imgproc/imgproc.hpp"#include <iostream>using namespace std;using namespace cv;static void help(){cout << "\nThis program demonstrates GrabCut segmentation -- select an object in a region\n""and then grabcut will attempt to segment it out.\n""Call:\n""./grabcut <image_name>\n""\nSelect a rectangular area around the object you want to segment\n" <<"\nHot keys: \n""\tESC - quit the program\n""\tr - restore the original image\n""\tn - next iteration\n""\n""\tleft mouse button - set rectangle\n""\n""\tCTRL+left mouse button - set GC_BGD pixels\n""\tSHIFT+left mouse button - set CG_FGD pixels\n""\n""\tCTRL+right mouse button - set GC_PR_BGD pixels\n""\tSHIFT+right mouse button - set CG_PR_FGD pixels\n" << endl;}const Scalar RED = Scalar(0,0,255);const Scalar PINK = Scalar(230,130,255);const Scalar BLUE = Scalar(255,0,0);const Scalar LIGHTBLUE = Scalar(255,255,160);const Scalar GREEN = Scalar(0,255,0);const int BGD_KEY = CV_EVENT_FLAG_CTRLKEY; //Ctrl键const int FGD_KEY = CV_EVENT_FLAG_SHIFTKEY; //Shift键static void getBinMask( const Mat& comMask, Mat& binMask ){if( comMask.empty() || comMask.type()!=CV_8UC1 )CV_Error( CV_StsBadArg, "comMask is empty or has incorrect type (not CV_8UC1)" );if( binMask.empty() || binMask.rows!=comMask.rows || binMask.cols!=comMask.cols )binMask.create( comMask.size(), CV_8UC1 );binMask = comMask & 1; //得到mask的最低位,实际上是只保留确定的或者有可能的前景点当做mask}class GCApplication{public:enum{ NOT_SET = 0, IN_PROCESS = 1, SET = 2 };static const int radius = 2;static const int thickness = -1;void reset();void setImageAndWinName( const Mat& _image, const string& _winName );void showImage() const;void mouseClick( int event, int x, int y, int flags, void* param );int nextIter();int getIterCount() const { return iterCount; }private:void setRectInMask();void setLblsInMask( int flags, Point p, bool isPr );const string* winName;const Mat* image;Mat mask;Mat bgdModel, fgdModel;uchar rectState, lblsState, prLblsState;bool isInitialized;Rect rect;vector<Point> fgdPxls, bgdPxls, prFgdPxls, prBgdPxls;int iterCount;};/*给类的变量赋值*/void GCApplication::reset(){if( !mask.empty() )mask.setTo(Scalar::all(GC_BGD));bgdPxls.clear(); fgdPxls.clear();prBgdPxls.clear(); prFgdPxls.clear();isInitialized = false;rectState = NOT_SET; //NOT_SET == 0lblsState = NOT_SET;prLblsState = NOT_SET;iterCount = 0;}/*给类的成员变量赋值而已*/void GCApplication::setImageAndWinName( const Mat& _image, const string& _winName ){if( _image.empty() || _winName.empty() )return;image = &_image;winName = &_winName;mask.create( image->size(), CV_8UC1);reset();}/*显示4个点,一个矩形和图像内容,因为后面的步骤很多地方都要用到这个函数,所以单独拿出来*/void GCApplication::showImage() const{if( image->empty() || winName->empty() )return;Mat res;Mat binMask;if( !isInitialized )image->copyTo( res );else{getBinMask( mask, binMask );image->copyTo( res, binMask ); //按照最低位是0还是1来复制,只保留跟前景有关的图像,比如说可能的前景,可能的背景}vector<Point>::const_iterator it;/*下面4句代码是将选中的4个点用不同的颜色显示出来*/for( it = bgdPxls.begin(); it != bgdPxls.end(); ++it ) //迭代器可以看成是一个指针circle( res, *it, radius, BLUE, thickness );for( it = fgdPxls.begin(); it != fgdPxls.end(); ++it ) //确定的前景用红色表示circle( res, *it, radius, RED, thickness );for( it = prBgdPxls.begin(); it != prBgdPxls.end(); ++it )circle( res, *it, radius, LIGHTBLUE, thickness );for( it = prFgdPxls.begin(); it != prFgdPxls.end(); ++it )circle( res, *it, radius, PINK, thickness );/*画矩形*/if( rectState == IN_PROCESS || rectState == SET )rectangle( res, Point( rect.x, rect.y ), Point(rect.x + rect.width, rect.y + rect.height ), GREEN, 2);imshow( *winName, res );}/*该步骤完成后,mask图像中rect内部是3,外面全是0*/void GCApplication::setRectInMask(){assert( !mask.empty() );mask.setTo( GC_BGD ); //GC_BGD == 0rect.x = max(0, rect.x);rect.y = max(0, rect.y);rect.width = min(rect.width, image->cols-rect.x);rect.height = min(rect.height, image->rows-rect.y);(mask(rect)).setTo( Scalar(GC_PR_FGD) ); //GC_PR_FGD == 3,矩形内部,为可能的前景点}void GCApplication::setLblsInMask( int flags, Point p, bool isPr ){vector<Point> *bpxls, *fpxls;uchar bvalue, fvalue;if( !isPr ) //确定的点{bpxls = &bgdPxls;fpxls = &fgdPxls;bvalue = GC_BGD; //0fvalue = GC_FGD; //1}else //概率点{bpxls = &prBgdPxls;fpxls = &prFgdPxls;bvalue = GC_PR_BGD; //2fvalue = GC_PR_FGD; //3}if( flags & BGD_KEY ){bpxls->push_back(p);circle( mask, p, radius, bvalue, thickness ); //该点处为2}if( flags & FGD_KEY ){fpxls->push_back(p);circle( mask, p, radius, fvalue, thickness ); //该点处为3}}/*鼠标响应函数,参数flags为CV_EVENT_FLAG的组合*/void GCApplication::mouseClick( int event, int x, int y, int flags, void* ){// TODO add bad args checkswitch( event ){case CV_EVENT_LBUTTONDOWN: // set rect or GC_BGD(GC_FGD) labels{bool isb = (flags & BGD_KEY) != 0,isf = (flags & FGD_KEY) != 0;if( rectState == NOT_SET && !isb && !isf )//只有左键按下时{rectState = IN_PROCESS; //表示正在画矩形rect = Rect( x, y, 1, 1 );}if ( (isb || isf) && rectState == SET ) //按下了alt键或者shift键,且画好了矩形,表示正在画前景背景点lblsState = IN_PROCESS;}break;case CV_EVENT_RBUTTONDOWN: // set GC_PR_BGD(GC_PR_FGD) labels{bool isb = (flags & BGD_KEY) != 0,isf = (flags & FGD_KEY) != 0;if ( (isb || isf) && rectState == SET ) //正在画可能的前景背景点prLblsState = IN_PROCESS;}break;case CV_EVENT_LBUTTONUP:if( rectState == IN_PROCESS ){rect = Rect( Point(rect.x, rect.y), Point(x,y) ); //矩形结束rectState = SET;setRectInMask();assert( bgdPxls.empty() && fgdPxls.empty() && prBgdPxls.empty() && prFgdPxls.empty() );showImage();}if( lblsState == IN_PROCESS ) //已画了前后景点{setLblsInMask(flags, Point(x,y), false); //画出前景点lblsState = SET;showImage();}break;case CV_EVENT_RBUTTONUP:if( prLblsState == IN_PROCESS ){setLblsInMask(flags, Point(x,y), true); //画出背景点prLblsState = SET;showImage();}break;case CV_EVENT_MOUSEMOVE:if( rectState == IN_PROCESS ){rect = Rect( Point(rect.x, rect.y), Point(x,y) );assert( bgdPxls.empty() && fgdPxls.empty() && prBgdPxls.empty() && prFgdPxls.empty() );showImage(); //不断的显示图片}else if( lblsState == IN_PROCESS ){setLblsInMask(flags, Point(x,y), false);showImage();}else if( prLblsState == IN_PROCESS ){setLblsInMask(flags, Point(x,y), true);showImage();}break;}}/*该函数进行grabcut算法,并且返回算法运行迭代的次数*/int GCApplication::nextIter(){if( isInitialized )//使用grab算法进行一次迭代,参数2为mask,里面存的mask位是:矩形内部除掉那些可能是背景或者已经确定是背景后的所有的点,且mask同时也为输出//保存的是分割后的前景图像grabCut( *image, mask, rect, bgdModel, fgdModel, 1 );else{if( rectState != SET )return iterCount;if( lblsState == SET || prLblsState == SET )grabCut( *image, mask, rect, bgdModel, fgdModel, 1, GC_INIT_WITH_MASK );elsegrabCut( *image, mask, rect, bgdModel, fgdModel, 1, GC_INIT_WITH_RECT );isInitialized = true;}iterCount++;bgdPxls.clear(); fgdPxls.clear();prBgdPxls.clear(); prFgdPxls.clear();return iterCount;}GCApplication gcapp;static void on_mouse( int event, int x, int y, int flags, void* param ){gcapp.mouseClick( event, x, y, flags, param );}int main( int argc, char** argv ){string filename = "C:\\Users\\ycadai\\Desktop\\9.jpg";Mat image = imread( filename, 1 );if( image.empty() ){cout << "\n Durn, couldn't read image filename " << filename << endl;return 1;}help();const string winName = "image";cvNamedWindow( winName.c_str(), CV_WINDOW_AUTOSIZE );cvSetMouseCallback( winName.c_str(), on_mouse, 0 );gcapp.setImageAndWinName( image, winName );gcapp.showImage();for(;;){int c = cvWaitKey(0);switch( (char) c ){case '\x1b':cout << "Exiting ..." << endl;goto exit_main;case 'r':cout << endl;gcapp.reset();gcapp.showImage();break;case 'n':int iterCount = gcapp.getIterCount();cout << "<" << iterCount << "... ";int newIterCount = gcapp.nextIter();if( newIterCount > iterCount ){gcapp.showImage();cout << iterCount << ">" << endl;}elsecout << "rect must be determined>" << endl;break;}}exit_main:cvDestroyWindow( winName.c_str() );return 0;}
真的很佩服这个算法!
运行结果:
A.
B.
C.
C例中的分割效果之好、迭代次数之少很让我惊讶。
D.
0 0
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