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answered 2015-04-07 05:49:10 -0600

Akki gravatar image

hi there,

i want to do detection using usb camera and the problem is that camera frame is not working fine means i can not get continue frame, i tried following code to detect the contour and draw rectangle around it.

#include "opencv/cv.h"

include "opencv/highgui.h"

include "opencv2/opencv.hpp"

include "opencv2/core/core.hpp"

include "opencv2/opencv.hpp"

include "opencv2/highgui/highgui.hpp"

include "opencv2/imgproc/imgproc.hpp"

include "iostream"

include "stdio.h"

include "string"

include <stdlib.h>

using namespace cv; using namespace std;

int lowerH=168; int upperH=256;

int lowerS=175; int upperS=256;

int lowerV=0; int upperV=256;

IplImage* frame = 0 ; IplImage* frame2 = 0 ; IplImage* imgHSV = 0 ; IplImage* imgThresh = 0 ;

vector<vector<point> > contours; vector<vec4i> hierarchy;

void draw_conture(IplImage * temp) {

cv::Mat tempm(temp,true);
findContours( tempm , contours, hierarchy, CV_RETR_TREE, CV_CHAIN_APPROX_SIMPLE, cv::Point(0, 0) );
vector<vector<cv::point> > contours_poly( contours.size() ); vector<rect> boundRect( contours.size() ); vector<float>area( contours.size() );

for( int i = 0; i < contours.size(); i++ ) { approxPolyDP( Mat(contours[i]), contours_poly[i], 3, true ); boundRect[i] = boundingRect( Mat(contours_poly[i]) ) ; area[i]= contourArea(Mat(contours_poly[i]));

}

const CvScalar color=CV_RGB(0x00,0xFF,0x00);
for( int i = 0; i< contours.size(); i++ ) {
if (area[i]>1000) rectangle(tempm, boundRect[i].tl(), boundRect[i].br(), color, 1, 1, 0 );

}

CvSeq* contour; //hold the pointer to a contour CvSeq* result; //hold sequence of points of a contour CvMemStorage *storage = cvCreateMemStorage(0); //storage area for all contours

cvFindContours(temp, storage, &contour, sizeof(CvContour), CV_RETR_LIST, CV_CHAIN_APPROX_SIMPLE, cvPoint(0,0));

for (; contour != 0; contour = contour->h_next) {
result = cvApproxPoly(contour, sizeof(CvContour), storage, CV_POLY_APPROX_DP, cvContourPerimeter(contour)*0.02, 0);
CvRect rect = cvBoundingRect(contour, 0); //extract bounding box for current contour if( cvContourArea(result, CV_WHOLE_SEQ,0) >= 1000 ) { cvDrawContours(frame, contour, CV_RGB(0,0,255), CV_RGB(0,0,255), 2, 1, 8, cvPoint(0, 0)); frame2 = cvCreateImage(cvGetSize(frame), frame->depth, frame->nChannels); cvCopy(frame, frame2); cvRectangle(frame2, cvPoint(rect.x, rect.y), cvPoint(rect.x+rect.width, rect.y+rect.height), CV_RGB(0,0,255),2, 8, 0);
cout<< "height =" << rect.height <<endl; cout&lt;&lt;="" "width=" &lt;&lt; rect.width &lt;&lt;endl; cout&lt;&lt; " x=" &lt;&lt; rect.x &lt;&lt;endl; cout&lt;&lt; " y=" &lt;&lt; rect.y &lt;&lt;endl;&lt;/p&gt; &lt;pre&gt;&lt;code&gt; } &lt;/code&gt;&lt;/pre&gt; &lt;p&gt;} &lt;/p&gt; &lt;p&gt;cvShowImage(" object="" color="" range",="" frame2);="" }<="" p="">

pragma region trackbar

void on_trackbar1(int position) {
lowerH = position;
cvInRangeS(imgHSV, cvScalar(lowerH,lowerS,lowerV), cvScalar(upperH,upperS,upperV),imgThresh); cvShowImage("Object Detected", imgThresh); draw_conture(imgThresh);
}

void on_trackbar2(int position) { upperH = position; cvInRangeS(imgHSV, cvScalar(lowerH,lowerS,lowerV), cvScalar(upperH,upperS,upperV),imgThresh); cvShowImage("Object Detected", imgThresh); draw_conture(imgThresh);
}

void on_trackbar3(int position) { lowerS = position;
cvInRangeS(imgHSV, cvScalar(lowerH,lowerS,lowerV), cvScalar(upperH,upperS,upperV),imgThresh); cvShowImage("Object Detected", imgThresh); draw_conture(imgThresh); }

void on_trackbar4(int position) { upperS = position;
cvInRangeS(imgHSV, cvScalar(lowerH,lowerS,lowerV), cvScalar(upperH,upperS,upperV),imgThresh); cvShowImage("Object Detected", imgThresh); draw_conture(imgThresh); }

void on_trackbar5(int position) { lowerV = position; cvInRangeS(imgHSV, cvScalar(lowerH,lowerS,lowerV), cvScalar(upperH,upperS,upperV),imgThresh); cvShowImage("Object Detected", imgThresh); draw_conture(imgThresh); }

void on_trackbar6(int position) { upperV = position; cvInRangeS(imgHSV, cvScalar(lowerH,lowerS,lowerV), cvScalar(upperH,upperS,upperV),imgThresh); cvShowImage("Object Detected", imgThresh); draw_conture(imgThresh); }

pragma endregion trackbar

int main() {

CvCapture *capture = 0;

CvSeq* contours; CvMemStorage *storage = cvCreateMemStorage(0);

capture = cvCaptureFromCAM(0); if (!cvGrabFrame(capture)) { printf("ERROR"); }

IplImage *frame = cvQueryFrame(capture); // to store the retrieved frames from the camera or any video IplImage *resultImage = cvCreateImage(cvGetSize(frame), 8, 1); // to store the resulted image IplImage *thresholdedImage = cvCreateImage(cvGetSize(frame), 8, 1); // to store the thresholded image

cvNamedWindow("Object Color Range", CV_WINDOW_AUTOSIZE); cvNamedWindow("Object Detected", CV_WINDOW_AUTOSIZE); while(1){ frame = cvQueryFrame(capture); if (!frame) { break; } cvCreateTrackbar("LowerH", "Object Detected", &lowerH, 256, on_trackbar1); cvCreateTrackbar("UpperH", "Object Detected", &upperH, 256, on_trackbar2); cvCreateTrackbar("LowerS", "Object Detected", &lowerS, 256, on_trackbar3); cvCreateTrackbar("UpperS", "Object Detected", &upperS, 256, on_trackbar4); cvCreateTrackbar("LowerV", "Object Detected", &lowerV, 256, on_trackbar5); cvCreateTrackbar("UpperV", "Object Detected", &upperV, 256, on_trackbar6); imgHSV = cvCreateImage(cvGetSize(frame), IPL_DEPTH_8U, 3 ) ;
imgThresh = cvCreateImage(cvGetSize(imgHSV),IPL_DEPTH_8U, 1);
cvCvtColor(frame, imgHSV, CV_BGR2HSV);
cvInRangeS(imgHSV, cvScalar(lowerH,lowerS,lowerV), cvScalar(upperH,upperS,upperV),imgThresh);

cvShowImage("Object Detected", imgThresh); cvShowImage("Object Color Range", frame);

draw_conture(imgThresh); cvWaitKey(0);

cvReleaseImage(&imgHSV); cvReleaseImage(&imgThresh); cvReleaseImage(&frame);

cvDestroyAllWindows(); } return 0;

}

i am getting error like access violation reading location c++.

how could i solve this problem.

thank you very much in advance.

click to hide/show revision 2
No.2 Revision

updated 2015-04-07 05:56:47 -0600

theodore gravatar image

hi there,

i want to do detection using usb camera and the problem is that camera frame is not working fine means i can not get continue frame, i tried following code to detect the contour and draw rectangle around it.

#include "opencv/cv.h"

include "opencv/highgui.h"

include "opencv2/opencv.hpp"

include "opencv2/core/core.hpp"

include "opencv2/opencv.hpp"

include "opencv2/highgui/highgui.hpp"

include "opencv2/imgproc/imgproc.hpp"

include "iostream"

include "stdio.h"

include "string"

include <stdlib.h>

#include "opencv/highgui.h" #include "opencv2/opencv.hpp" #include "opencv2/core/core.hpp" #include "opencv2/opencv.hpp" #include "opencv2/highgui/highgui.hpp" #include "opencv2/imgproc/imgproc.hpp" #include "iostream" #include "stdio.h" #include "string" #include <stdlib.h> using namespace cv; using namespace std;

std; int lowerH=168; int upperH=256;

upperH=256; int lowerS=175; int upperS=256;

upperS=256; int lowerV=0; int upperV=256;

IplImage* frame = 0 ; IplImage* frame2 = 0 ; IplImage* imgHSV = 0 ; IplImage* imgThresh = 0 ;

vector<vector<point> ; vector<vector<Point> > contours; vector<vec4i> hierarchy;

vector<Vec4i> hierarchy; void draw_conture(IplImage * temp) {

{ cv::Mat tempm(temp,true);
findContours( tempm , contours, hierarchy, CV_RETR_TREE, CV_CHAIN_APPROX_SIMPLE, cv::Point(0, 0) );
vector<vector<cv::point> vector<vector<cv::Point> > contours_poly( contours.size() ); vector<rect> vector<Rect> boundRect( contours.size() ); vector<float>area( contours.size() );

); for( int i = 0; i < contours.size(); i++ ) { approxPolyDP( Mat(contours[i]), contours_poly[i], 3, true ); boundRect[i] = boundingRect( Mat(contours_poly[i]) ) ; area[i]= contourArea(Mat(contours_poly[i]));

}

contourArea(Mat(contours_poly[i])); } const CvScalar color=CV_RGB(0x00,0xFF,0x00);
for( int i = 0; i< contours.size(); i++ ) {
if (area[i]>1000) rectangle(tempm, boundRect[i].tl(), boundRect[i].br(), color, 1, 1, 0 );

}

} CvSeq* contour; //hold the pointer to a contour CvSeq* result; //hold sequence of points of a contour CvMemStorage *storage = cvCreateMemStorage(0); //storage area for all contours

contours cvFindContours(temp, storage, &contour, sizeof(CvContour), CV_RETR_LIST, CV_CHAIN_APPROX_SIMPLE, cvPoint(0,0));

cvPoint(0,0)); for (; contour != 0; contour = contour->h_next) {
result = cvApproxPoly(contour, sizeof(CvContour), storage, CV_POLY_APPROX_DP, cvContourPerimeter(contour)*0.02, 0);
CvRect rect = cvBoundingRect(contour, 0); //extract bounding box for current contour if( cvContourArea(result, CV_WHOLE_SEQ,0) >= 1000 ) { cvDrawContours(frame, contour, CV_RGB(0,0,255), CV_RGB(0,0,255), 2, 1, 8, cvPoint(0, 0)); frame2 = cvCreateImage(cvGetSize(frame), frame->depth, frame->nChannels); cvCopy(frame, frame2); cvRectangle(frame2, cvPoint(rect.x, rect.y), cvPoint(rect.x+rect.width, rect.y+rect.height), CV_RGB(0,0,255),2, 8, 0);
cout<< "height =" << rect.height <<endl; cout&lt;&lt;="" "width=" &lt;&lt; <<endl; cout<< "width =" << rect.width &lt;&lt;endl; cout&lt;&lt; " x=" &lt;&lt; <<endl; cout<< "x =" << rect.x &lt;&lt;endl; cout&lt;&lt; " y=" &lt;&lt; <<endl; cout<< "y =" << rect.y &lt;&lt;endl;&lt;/p&gt; &lt;pre&gt;&lt;code&gt; <<endl; } } cvShowImage("Object Color Range", frame2); } &lt;/code&gt;&lt;/pre&gt; &lt;p&gt;} &lt;/p&gt; &lt;p&gt;cvShowImage(" object="" color="" range",="" frame2);="" }<="" p="">

pragma #pragma region trackbar

trackbar void on_trackbar1(int position) {
lowerH = position;
cvInRangeS(imgHSV, cvScalar(lowerH,lowerS,lowerV), cvScalar(upperH,upperS,upperV),imgThresh); cvShowImage("Object Detected", imgThresh); draw_conture(imgThresh);
}

} void on_trackbar2(int position) { upperH = position; cvInRangeS(imgHSV, cvScalar(lowerH,lowerS,lowerV), cvScalar(upperH,upperS,upperV),imgThresh); cvShowImage("Object Detected", imgThresh); draw_conture(imgThresh);
}

} void on_trackbar3(int position) { lowerS = position;
cvInRangeS(imgHSV, cvScalar(lowerH,lowerS,lowerV), cvScalar(upperH,upperS,upperV),imgThresh); cvShowImage("Object Detected", imgThresh); draw_conture(imgThresh); }

} void on_trackbar4(int position) { upperS = position;
cvInRangeS(imgHSV, cvScalar(lowerH,lowerS,lowerV), cvScalar(upperH,upperS,upperV),imgThresh); cvShowImage("Object Detected", imgThresh); draw_conture(imgThresh); }

} void on_trackbar5(int position) { lowerV = position; cvInRangeS(imgHSV, cvScalar(lowerH,lowerS,lowerV), cvScalar(upperH,upperS,upperV),imgThresh); cvShowImage("Object Detected", imgThresh); draw_conture(imgThresh); }

} void on_trackbar6(int position) { upperV = position; cvInRangeS(imgHSV, cvScalar(lowerH,lowerS,lowerV), cvScalar(upperH,upperS,upperV),imgThresh); cvShowImage("Object Detected", imgThresh); draw_conture(imgThresh); }

pragma } #pragma endregion trackbar

trackbar int main() {

{ CvCapture *capture = 0;

0; CvSeq* contours; CvMemStorage *storage = cvCreateMemStorage(0);

cvCreateMemStorage(0); capture = cvCaptureFromCAM(0); if (!cvGrabFrame(capture)) { printf("ERROR"); }

} IplImage *frame = cvQueryFrame(capture); // to store the retrieved frames from the camera or any video IplImage *resultImage = cvCreateImage(cvGetSize(frame), 8, 1); // to store the resulted image IplImage *thresholdedImage = cvCreateImage(cvGetSize(frame), 8, 1); // to store the thresholded image

image cvNamedWindow("Object Color Range", CV_WINDOW_AUTOSIZE); cvNamedWindow("Object Detected", CV_WINDOW_AUTOSIZE); while(1){ frame = cvQueryFrame(capture); if (!frame) { break; } cvCreateTrackbar("LowerH", "Object Detected", &lowerH, 256, on_trackbar1); cvCreateTrackbar("UpperH", "Object Detected", &upperH, 256, on_trackbar2); cvCreateTrackbar("LowerS", "Object Detected", &lowerS, 256, on_trackbar3); cvCreateTrackbar("UpperS", "Object Detected", &upperS, 256, on_trackbar4); cvCreateTrackbar("LowerV", "Object Detected", &lowerV, 256, on_trackbar5); cvCreateTrackbar("UpperV", "Object Detected", &upperV, 256, on_trackbar6); imgHSV = cvCreateImage(cvGetSize(frame), IPL_DEPTH_8U, 3 ) ;
imgThresh = cvCreateImage(cvGetSize(imgHSV),IPL_DEPTH_8U, 1);
cvCvtColor(frame, imgHSV, CV_BGR2HSV);
cvInRangeS(imgHSV, cvScalar(lowerH,lowerS,lowerV), cvScalar(upperH,upperS,upperV),imgThresh);

cvShowImage("Object Detected", imgThresh); cvShowImage("Object Color Range", frame);

frame); draw_conture(imgThresh); cvWaitKey(0);

cvWaitKey(0); cvReleaseImage(&imgHSV); cvReleaseImage(&imgThresh); cvReleaseImage(&frame);

cvReleaseImage(&frame); cvDestroyAllWindows(); } return 0;

}

0; }

i am getting error like access violation reading location c++.

how could i solve this problem.

thank you very much in advance.

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