矩形框裁图

用C++、opencv2.4之前版本写的一个矩形框裁图的代码,现在很多截图软件,应该用不上了,但是可以学习一下处理思路。

代码如下:

#include "stdafx.h"
#include "cv.h"  
#include "highgui.h"  
#include   
#include   
#include   
#include    

CvPoint pt1 = cvPoint(0, 0);
CvPoint pt2 = cvPoint(0, 0);
bool is_selecting = false;

//鼠标回调函数   
void cvMouseCallback(int mouseEvent, int x, int y, int flags, void* param)
{
	switch (mouseEvent)
	{
	case CV_EVENT_LBUTTONDOWN://鼠标左键按下
		pt1 = cvPoint(x, y);
		pt2 = cvPoint(x, y);
		is_selecting = true;
		break;
	case CV_EVENT_MOUSEMOVE://鼠标移动
		if (is_selecting)
			pt2 = cvPoint(x, y);
		break;
	case CV_EVENT_LBUTTONUP://鼠标左键松开
		pt2 = cvPoint(x, y);
		is_selecting = false;
		break;
	}
	return;
}

int main(int argc, char* argv[])
{
	printf("用鼠标左键在图像窗口中画框,以得到目标区域的大致位置.\n然后用a, s, d, w移动所选区域,用1,2, 3, 5放大或缩小之\n由于opencv中键盘响应函数不能响应键盘中的方向键、shift键和ctrl键\n所以用tab来切换状态(放大和缩小)。\n选择结束后用enter键保存。Esc键退出。");  

	char img_path[80] = "D:\\哀.jpg";
	char save_path[80] = "D:\\save.jpg";
	char* window = "img";

	IplImage* img = cvLoadImage(img_path);
	IplImage* img_show = cvCloneImage(img);

	cvNamedWindow(window, CV_WINDOW_AUTOSIZE);
	cvSetMouseCallback(window, cvMouseCallback);

	bool shift_on = false;

	char text[80];
	CvFont font;
	cvInitFont(&font, CV_FONT_HERSHEY_PLAIN, 1.0, 1.0);
	while (true)
	{
		cvCopy(img, img_show);
		cvRectangle(img_show, pt1, pt2, cvScalar(255, 255, 255));
		sprintf_s(text, "roi = cvRect(%d,%d,%d,%d)", pt1.x, pt1.y, std::abs(pt2.x - pt1.x), std::abs(pt2.y - pt1.y));
		cvPutText(img_show, text, cvPoint(10, 20), &font, cvScalar(0, 0, 255));

		cvShowImage(window, img_show);
		char key = cvWaitKey(10);
		switch (key)
		{
		case '\t':
			shift_on = !shift_on; break;

		case 'a':
			pt1.x--; pt2.x--; break;
		case 's':
			pt1.y++; pt2.y++; break;
		case 'd':
			pt1.x++; pt2.x++; break;
		case 'w':
			pt1.y--; pt2.y--; break;

		case '1':
			if (shift_on) pt1.x--;
			else pt2.x--;
			break;
		case '2':
			if (shift_on) pt2.y++;
			else pt1.y++;
			break;
		case '3':
			if (shift_on) pt2.x++;
			else pt1.x++;
			break;
		case '5':
			if (shift_on) pt1.y--;
			else pt2.y--;
			break;

		case '\r':
			cvSetImageROI(img, cvRect(pt1.x, pt1.y, std::abs(pt2.x - pt1.x), std::abs(pt2.y - pt1.y)));
			cvSaveImage(save_path, img);
			cvResetImageROI(img);
			break;
		};

		if (key == 27) break;
	}

	cvReleaseImage(&img);
	cvReleaseImage(&img_show);
	return 0;
} 

 源图像:

矩形框裁图_第1张图片

裁剪后图像:

矩形框裁图_第2张图片

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