学步园

此篇跟上篇画矩形框类似。画框改为画点。用floodfill和带有掩码的copyTo得到抠图。右击确定floodFill中的种子点。

参考自http://blog.csdn.net/cv_yuippe/article/details/13035063

// substr.cpp : 定义控制台应用程序的入口点。
//

#include "stdafx.h"
#include <string>
#include <iostream>
#include <vector>
#include <OpenCV245.h>

using namespace std;
using namespace cv;

Point p0 = Point(-1,-1);
bool select_flag = false;
Mat img,showImg;
Mat imgmask;

void onMouse(int event,int x,int y,int flags,void*param)
{
	if(event==CV_EVENT_LBUTTONDOWN)
	{		
		p0.x = x;
		p0.y = y;
		select_flag = true;
	}
	else if(select_flag &&event == CV_EVENT_MOUSEMOVE)
	{
		Point pt = Point(x,y);
		line(showImg,p0,pt,Scalar(0,255,0),2,8,0);
		line(imgmask,p0,pt,Scalar::all(0),2,8,0);
		p0 = pt;
		imshow("showImg",showImg);
	}
	else if(select_flag && event == CV_EVENT_LBUTTONUP)
	{
		select_flag = false;
		p0 = Point(-1,-1);
		//img.copyTo(showImg);
	}	
	else if(event == CV_EVENT_RBUTTONUP)//右击显示抠出的图
	{
		Mat dst;//若希望将圈选的结果相加，定义在外头
		floodFill(imgmask,Point(x,y),Scalar(0));//point种子点所在的连通域被填充
		//imshow("floodFill",imgmask);
		img.copyTo(dst,imgmask);//mask中所有不为零的点被dst对应的值填充
		imshow("dst",dst);	
		img.copyTo(showImg);
		imgmask.setTo(Scalar(255));//重新取值
	}

}
//框图超过画面时会报错
int _tmain(int argc, _TCHAR* argv[])
{
    img = imread("C:\\Users\\Ma Ruihuan\\Desktop\\Lena.jpg",1);
	img.copyTo(showImg);

	imgmask.create(img.size(),CV_8UC1);
	imgmask.setTo(Scalar(255));

	namedWindow("showImg");
	imshow("showImg",showImg);
	setMouseCallback("showImg",onMouse,0);

	waitKey(0);
	//system("pause");
	return 0;
}