我有视频,当程序运行时,视频的第一帧被作为图像,用户可以在图像上绘制一个矩形,绘制矩形后,用户必须右键单击图像以确认矩形。当鼠标右键单击图像消失时,视频开始播放,上面绘制的矩形。
我能够完美地绘制矩形,但我不能将该矩形设置为 ROI。
我想要做的是将该矩形设置为感兴趣区域 (ROI) 以对该 ROI 进行一些图像处理。我无法将绘制的矩形设置为 ROI。
我在 Visual Studio 2010 中使用 OpenCV。稍后我将尝试将此程序集成到 QT creator 中。
任何帮助,将不胜感激。
提前致谢。
我的完整代码如下:
#include <stdlib.h>
#include <stdio.h>
#include <math.h>
#include <string.h>
#include<opencv2\opencv.hpp>
#include <opencv2\highgui\highgui.hpp>
#include <opencv/highgui.h>
#include <opencv/cxcore.h>
#include <opencv\cvaux.h>
using namespace cv;
using namespace std;
void my_mouse_callback( int event, int x, int y, int flags, void* param );
bool destroy=false;
CvRect box;
IplImage* image;
IplImage* frame2;
bool drawing_box = false;
void draw_box( IplImage* img, CvRect rect)
{
cvRectangle( img, cvPoint(box.x, box.y), cvPoint(box.x+box.width,box.y+box.height),
cvScalar(0,0,255) ,2);
CvRect rect2=cvRect(box.x,box.y,box.width,box.height);
//cvSetImageROI(image, rect2); //here I wanted to set the drawn rect as ROI
}
// Implement mouse callback
void my_mouse_callback( int event, int x, int y, int flags, void* param ){
IplImage* image = (IplImage*) param;
switch( event ){
case CV_EVENT_MOUSEMOVE:
if( drawing_box )
{
box.width = x-box.x;
box.height = y-box.y;
}
break;
case CV_EVENT_LBUTTONDOWN:
drawing_box = true;
box = cvRect( x, y, 0, 0 );
break;
case CV_EVENT_LBUTTONUP:
drawing_box = false;
if( box.width < 0 )
{
box.x += box.width;
box.width *= -1;
}
if( box.height < 0 )
{
box.y += box.height;
box.height *= -1;
}
draw_box( image, box);
break;
case CV_EVENT_RBUTTONUP:
destroy=true;
}
}
int main()
{
const char* name = "Box Example";
cvNamedWindow( name );
box = cvRect(0,0,1,1);
CvCapture* capture = cvCreateFileCapture( "C:\\video.mp4" );
image = cvQueryFrame( capture );
IplImage* temp = cvCloneImage( image );
// Set up the callback
cvSetMouseCallback( name, my_mouse_callback, (void*) image);
//IplImage *img2 = cvCreateImage(cvGetSize(temp),temp->depth,temp->nChannels);
//cvNot(temp,temp);
/* copy subimage */
//cvCopy(temp, temp, NULL);
// Main loop
while( 1 )
{
if(destroy) {cvDestroyWindow(name); break;}
cvCopyImage( image, temp );
if( drawing_box )
draw_box( temp, box );
cvMoveWindow(name, 200, 100);
cvShowImage( name, temp );
if( cvWaitKey( 15 )==27 )
break;
}
//cvReleaseImage( &image );
cvReleaseImage( &temp );
cvDestroyWindow( name );
cvNamedWindow( "Example2", CV_WINDOW_AUTOSIZE );
cvMoveWindow("Example2", 150, 150);
while(1)
{
frame2 = cvQueryFrame( capture );
draw_box(frame2,box);
if( !frame2 ) break;
cvShowImage( "Example2", frame2 );
char c = cvWaitKey(33);
if( c == 27 ) break;
}
cvReleaseCapture( &capture );
cvDestroyWindow( "Example2" );
return 0;
}