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[英]Exception Unhandled Error Scanning an Image with OpenCV Using .at() in c++
[英]Unhandled exception in C++ using OpenCV libraries
我是OpenCV的新手並嘗試了一些東西。 我想用網絡攝像頭檢測一只手,這是一個簡單的代碼。 但它給了我類似的東西: HaarCascade.exe中0x000000013f5b140b處的未處理異常:0xC0000005:訪問沖突讀取位置0x0000000000000004。
#include <opencv2/opencv.hpp>
using namespace cv;
using namespace std;
IplImage* img = 0;
CvHaarClassifierCascade *cascade;
CvMemStorage *cstorage;
CvMemStorage *hstorage;
void detectObjects( IplImage *img );
int key;
int main( int argc, char** argv )
{
CvCapture *capture;
IplImage *frame;
// loads classifier for hand haar cascade
char *filename = "haarcascade_hand.xml";
cascade = ( CvHaarClassifierCascade* )cvLoad( "haarcascade_hand.xml", 0, 0, 0 );
// setup memory buffer
hstorage = cvCreateMemStorage( 0 );
cstorage = cvCreateMemStorage( 0 );
// initialize camera
capture = cvCaptureFromCAM( 0 );
// always check
//assert( cascade && storage && capture );
// create a window
cvNamedWindow( "Camera", 1 );
while(key!='q') {
// captures frame and check every frame
frame = cvQueryFrame( capture );
if( !frame ) break;
// detect objects and display video
detectObjects (frame );
// quit if user press 'q'
key = cvWaitKey( 10 );
}
// free memory
cvReleaseCapture( &capture );
cvDestroyAllWindows();
cvReleaseHaarClassifierCascade( &cascade );
cvReleaseMemStorage( &cstorage );
cvReleaseMemStorage( &hstorage );
return 0;
}
void detectObjects( IplImage *img )
{
int px;
int py;
int edge_thresh = 1;
IplImage *gray = cvCreateImage( cvSize(640,480), 8, 1 );
IplImage *edge = cvCreateImage( cvSize(640,480), 8, 1 );
// convert video image color
cvCvtColor(img,gray,CV_BGR2GRAY);
// set the converted image's origin
gray->origin=1;
// color threshold
cvThreshold(gray,gray,100,255,CV_THRESH_BINARY);
// smooths out image
cvSmooth(gray, gray, CV_GAUSSIAN, 11, 11);
// get edges
cvCanny(gray, edge, (float)edge_thresh, (float)edge_thresh*3, 5);
// detects circle
CvSeq* circle = cvHoughCircles(gray, cstorage, CV_HOUGH_GRADIENT, 1, gray->height/50, 5, 35);
// draws circle and its centerpoint
float* p = (float*)cvGetSeqElem( circle, 0 );
cvCircle( img, cvPoint(cvRound(p[0]),cvRound(p[1])), 3, CV_RGB(255,0,0), -1, 8, 0 );
cvCircle( img, cvPoint(cvRound(p[0]),cvRound(p[1])), cvRound(p[2]), CV_RGB(200,0,0), 1, 8, 0 );
px=cvRound(p[0]);
py=cvRound(p[1]);
// displays coordinates of circle's center
cout <<"(x,y) -> ("<<px<<","<<py<<")"<<endl;
// detects hand
CvSeq *hand = cvHaarDetectObjects(img, cascade, hstorage, 1.2, 2, CV_HAAR_DO_CANNY_PRUNING, cvSize(100, 100));
// draws red box around hand when detected
CvRect *r = ( CvRect* )cvGetSeqElem( hand, 0 );
cvRectangle( img,
cvPoint( r->x, r->y ),
cvPoint( r->x + r->width, r->y + r->height ),
CV_RGB( 255, 0, 0 ), 1, 8, 0 );
cvShowImage("Camera",img);
}
圖片: http : //i.imgur.com/Dneiw.png
感謝您的所有回復。
cvLoad()
有可能失敗,因為它沒有找到該文件。 這是一個問題,因為您稍后使用它,如果它是一個NULL指針,它可能會崩潰您的應用程序:
但除非你測試函數的返回,否則你永遠不會知道這個:
cascade = ( CvHaarClassifierCascade* )cvLoad( "haarcascade_hand.xml", 0, 0, 0 );
if (!cascade)
// Print something to say it failed!
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