opencv 实现鼠标输入框选ROI区域

1. 前言

本文主要是使用opencv库实现从鼠标输入框选ROI区域，框选后截图并将框选出的区域的像素值保存在txt文本中，同一张图片可以重复框选区域并保存信息，当前图片信息框选完成后，按空格键可进入到下一张图片进行操作。

2. 实践

// label.cpp : 定义控制台应用程序的入口点。
//

#include "stdafx.h"
#include <opencv.hpp>
#include <string>

using namespace cv;
using namespace std;

cv::Mat org,dst,img,tmp;
Point prevPt = Point(-1, -1);
string lpath = "..//..//";
string rpath = "..//..//";

int laneCount = 1;
int roadCount = 1;

bool flag = 1;
int GetImageValue(Mat& img,  int flag)
{

	if (flag == 1)
	{
		char buffer[1];
		itoa(laneCount, buffer, 10);
		string str = buffer;

		string path = "";
		path = lpath + str + "-lane.txt";
		ofstream fp(path);
		if (!fp)
		{
			printf("file open failed!");
			return -1;
		}

		for (int i = 0; i < img.rows; i++)
		{
			uchar* data = img.ptr<uchar>(i);
			for (int j = 0; j < img.cols * 3; j = j + 3)
			{
				fp << (int)data[j] << "," << (int)data[j + 1] << "," << (int)data[j + 2] << "," << flag << endl;;
			}
			
		}
		laneCount++;

	}
	else
	{
		char buffer[1];
		itoa(roadCount, buffer, 10);
		string str = buffer;

		string path = "";
		path = rpath + str + "-road.txt";

		ofstream fp(path);
		if (!fp)
		{
			printf("file open failed!");
			return -1;
		}
		for (int i = 0; i < img.rows; i++)
		{
			uchar* data = img.ptr<uchar>(i);
			for (int j = 0; j < img.cols * 3; j = j + 3)
			{
				fp << (int)data[j] << "," << (int)data[j + 1] << "," << (int)data[j + 2] << "," << flag << endl;
			}
		}
		roadCount++;
	}

	return 1;


}
void OnMouse(int event, int x, int y, int flags, void* ustc)
{
	static Point pre_pt = (-1, -1);
	static Point cur_pt = (-1, -1);
	if (event == CV_EVENT_LBUTTONDOWN)
	{
		org.copyTo(img);
		pre_pt = Point(x, y);
	}
	else if (event == CV_EVENT_MOUSEMOVE && (flags & CV_EVENT_FLAG_LBUTTON))//摁下左键，flags为1 
	{
		img.copyTo(tmp);
		cur_pt = Point(x, y);
		rectangle(tmp, pre_pt, cur_pt, Scalar(0, 255, 0, 0), 1, 8, 0);
		imshow("img", tmp);
	}
	else if (event == CV_EVENT_LBUTTONUP)
	{
		org.copyTo(img);
		cur_pt = Point(x, y);
		rectangle(img, pre_pt, cur_pt, Scalar(0, 255, 0, 0), 1, 8, 0);
		imshow("img", img);
		img.copyTo(tmp);
		int width = abs(pre_pt.x - cur_pt.x);
		int height = abs(pre_pt.y - cur_pt.y);
		if (width == 0 || height == 0)
		{
			return;
		}
		dst = org(Rect(min(cur_pt.x, pre_pt.x), min(cur_pt.y, pre_pt.y), width, height));
		Mat temp = dst.clone();
		GetImageValue(temp, flag);
		namedWindow("dst", 1);
		imshow("dst", dst);
	}
}
int main()
{
	string imgPath = "";

	vector<String> vecFilename;
	glob(imgPath, vecFilename);

	for (int i = 0; i < vecFilename.size(); i++)
	{
		Mat tempImg = imread(vecFilename[i], 1);

		tempImg.copyTo(org);
		org.copyTo(img);
		namedWindow("img");
		setMouseCallback("img", OnMouse, 0);
		imshow("img", img);
		waitKey(0);

	}
	return 0;
}

// ReductionDimension.cpp : 定义控制台应用程序的入口点。
//

#include "stdafx.h"
#include <opencv.hpp>

using namespace cv;
using namespace std;


int GetLineNumber(string path)
{
	ifstream fp(path);
	string line;
	int lineNum = 0;
	while (getline(fp, line))
	{ 
		lineNum++;
	}

	return lineNum;
}

void GetMatAndLabel(string path, Mat& dataMat, vector<int>& label)
{
	ifstream fp(path);
	
	int rsize = GetLineNumber(path);

	Mat temp = Mat::zeros(Size(3, rsize), CV_8UC1);
	temp.copyTo(dataMat);

	if (!fp)
	{
		printf("open failed");
	}
	string line;
	vector<int> value;
	while (getline(fp, line))
	{
		int pos = 0;
		vector<int> index;

		//index.push_back(0);
		while ((pos = line.find(",", pos)) != string::npos)
		{
			index.push_back(pos);
			pos++;
		}
		index.push_back(line.size());
		
		string subStr;
		for (int i = 0; i < index.size(); i++)
		{
			if (i == 0)
			{
				subStr = line.substr(0, index[i]);

				int val = stoi(subStr);
				value.push_back(val);
			}
			else if (i < 3 && i != 0)
			{
				subStr = line.substr(index[i - 1] + 1, index[i] - index[i - 1] - 1);

				int val = stoi(subStr);
				value.push_back(val);
			}
			else
			{
				subStr = line.substr(index[i - 1] + 1, index[i] - index[i - 1] - 1);

				int val = stoi(subStr);
				label.push_back(val);
			}
		}
	}
	int count = 0;
	for (int i = 0; i < dataMat.rows; i++)
	{
		uchar* data = dataMat.ptr<uchar>(i);

		for (int j = 0; j < dataMat.cols; j++)
		{
			data[j] = value[count];
			count++;
		}
	}
}
int main()
{
	char* lanepath = "D:\temp\label\lane.txt";
	char* roadpath = "D:\temp\label\road.txt";

	Mat laneMat, roadMat, dataMat;
	vector<int> laneLabel, roadLabel, label;
	GetMatAndLabel(roadpath, roadMat, roadLabel);
	GetMatAndLabel(lanepath, laneMat, laneLabel);
	
	vconcat(roadMat, laneMat, dataMat);
	label.insert(label.end(), roadLabel.begin(), roadLabel.end());
	label.insert(label.end(), laneLabel.begin(), laneLabel.end());


	LDA lda = LDA(dataMat, label, 1);

	Mat eigvector = lda.eigenvectors().clone();

    return 0;
}

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