Create Exercises_13_9.cpp

Author: jsxyhelu

Exercises_13_9.cpp

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+
+//Exercises_13_9.cpp Exercise 9 at end of Chapter 13
+/************************************************************************/
+	/* 9. Write  an  image-processing  function  to  interactively  remove  people  from  an
+	image. Use cv::grabCut() to segment the person, and then use cv::inpaint()
+	to  fill  in  the  resulting  hole  (recall  that  we  learned  about  cv::inpaint()  in  the
+	previous chapter).                                                                     */
+/************************************************************************/
+
+
+#include "opencv2/imgcodecs.hpp"
+#include "opencv2/highgui.hpp"
+#include "opencv2/imgproc.hpp"
+#include "opencv2/photo.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 GC_FGD pixels\n"
+		"\n"
+		"\tCTRL+right mouse button - set GC_PR_BGD pixels\n"
+		"\tSHIFT+right mouse button - set GC_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 = EVENT_FLAG_CTRLKEY;
+const int FGD_KEY = EVENT_FLAG_SHIFTKEY;
+
+static void getBinMask( const Mat& comMask, Mat& binMask )
+{
+	if( comMask.empty() || comMask.type()!=CV_8UC1 )
+		CV_Error( Error::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;
+}
+
+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;
+};
+
+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;
+	lblsState = NOT_SET;
+	prLblsState = NOT_SET;
+	iterCount = 0;
+}
+
+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();
+}
+
+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 );
+		// mask and source code
+		Mat src = *image;
+		Mat mask = binMask;
+		//inpaint
+		Mat inpainted;
+		inpaint(src, mask, inpainted, 3, CV_INPAINT_TELEA);
+	    imshow("inpainted result",inpainted);
+	}
+
+	vector<Point>::const_iterator it;
+	for( it = bgdPxls.begin(); it != bgdPxls.end(); ++it )
+		circle( res, *it, radius, BLUE, thickness );
+	for( it = fgdPxls.begin(); it != fgdPxls.end(); ++it )
+		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 );
+
+	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 );
+}
+
+void GCApplication::setRectInMask()
+{
+	CV_Assert( !mask.empty() );
+	mask.setTo( GC_BGD );
+	rect.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) );
+}
+
+void GCApplication::setLblsInMask( int flags, Point p, bool isPr )
+{
+	vector<Point> *bpxls, *fpxls;
+	uchar bvalue, fvalue;
+	if( !isPr )
+	{
+		bpxls = &bgdPxls;
+		fpxls = &fgdPxls;
+		bvalue = GC_BGD;
+		fvalue = GC_FGD;
+	}
+	else
+	{
+		bpxls = &prBgdPxls;
+		fpxls = &prFgdPxls;
+		bvalue = GC_PR_BGD;
+		fvalue = GC_PR_FGD;
+	}
+	if( flags & BGD_KEY )
+	{
+		bpxls->push_back(p);
+		circle( mask, p, radius, bvalue, thickness );
+	}
+	if( flags & FGD_KEY )
+	{
+		fpxls->push_back(p);
+		circle( mask, p, radius, fvalue, thickness );
+	}
+}
+
+void GCApplication::mouseClick( int event, int x, int y, int flags, void* )
+{
+	// TODO add bad args check
+	switch( event )
+	{
+	case 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 )
+			{
+				rectState = IN_PROCESS;
+				rect = Rect( x, y, 1, 1 );
+			}
+			if ( (isb || isf) && rectState == SET )
+				lblsState = IN_PROCESS;
+		}
+		break;
+	case 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 )
+				prLblsState = IN_PROCESS;
+		}
+		break;
+	case EVENT_LBUTTONUP:
+		if( rectState == IN_PROCESS )
+		{
+			rect = Rect( Point(rect.x, rect.y), Point(x,y) );
+			rectState = SET;
+			setRectInMask();
+			CV_Assert( bgdPxls.empty() && fgdPxls.empty() && prBgdPxls.empty() && prFgdPxls.empty() );
+			showImage();
+		}
+		if( lblsState == IN_PROCESS )
+		{
+			setLblsInMask(flags, Point(x,y), false);
+			lblsState = SET;
+			showImage();
+		}
+		break;
+	case EVENT_RBUTTONUP:
+		if( prLblsState == IN_PROCESS )
+		{
+			setLblsInMask(flags, Point(x,y), true);
+			prLblsState = SET;
+			showImage();
+		}
+		break;
+	case EVENT_MOUSEMOVE:
+		if( rectState == IN_PROCESS )
+		{
+			rect = Rect( Point(rect.x, rect.y), Point(x,y) );
+			CV_Assert( bgdPxls.empty() && fgdPxls.empty() && prBgdPxls.empty() && prFgdPxls.empty() );
+			showImage();
+		}
+		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;
+	}
+}
+
+int GCApplication::nextIter()
+{
+	if( isInitialized )
+		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 );
+		else
+			grabCut( *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 )
+{
+	cv::CommandLineParser parser(argc, argv, "{help h||}{@input||}");
+	if (parser.has("help"))
+	{
+		help();
+		return 0;
+	}
+	string filename = parser.get<string>("@input");
+	if( filename.empty() )
+	{
+		cout << "\nDurn, empty filename" << endl;
+		return 1;
+	}
+	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";
+	namedWindow( winName, WINDOW_AUTOSIZE );
+	setMouseCallback( winName, on_mouse, 0 );
+
+	gcapp.setImageAndWinName( image, winName );
+	gcapp.showImage();
+
+	for(;;)
+	{
+		char c = (char)waitKey(0);
+		switch( 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;
+			}
+			else
+				cout << "rect must be determined>" << endl;
+			break;
+		}
+	}
+
+exit_main:
+	destroyWindow( winName );
+	return 0;
+}