c++ - Circle and hand detection in OpenCV -

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beginner here. i'm trying detect circle , hand, , draw circle around circle , rectangle around hand, , display both in same image. when run program memory error, can please help?

below code:

#include "opencv/cv.h" #include "opencv2\highgui\highgui.hpp" #include <iostream> #include <stdio.h> #include <math.h> #include <string.h> #include <conio.h>  using namespace std;  //declarations 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 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 );  // check //assert( cascade && storage && capture );  // create window cvnamedwindow( "camera", 1 );  while(key!='q') {     // captures frame , check every frame     frame = cvqueryframe( capture );     if( !frame ) break;      // detect objects , 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 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);  // 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 , 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); }

the issue size of gray scale image created should same of image obtained camera.

instead of:

iplimage *gray = cvcreateimage( cvsize(640,480), 8, 1 );

write as:

iplimage *gray = cvcreateimage( cvsize(img->width,img->height), 8, 1);

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