// This is a program to find SQUARE shape and Circle shape
#include "cv.h"
#include "cxcore.h"
#include "highgui.h"
#include < math.h >
int main(int argc, char* argv[])
{
IplImage* img=0;
IplImage* gray=0;
CvMemStorage* storage = cvCreateMemStorage(0);
CvSeq* contours;
img=cvLoadImage("shape.jpg");
if(img==NULL)
{
printf("Error in opening image\n");
return -1;
}
cvNamedWindow("win1",1);
cvNamedWindow("win2",1);
gray = cvCreateImage( cvSize(img->width, img->height), IPL_DEPTH_8U, 1 );
cvCvtColor(img,gray,CV_BGR2GRAY );
uchar *data;
data=(uchar* )img->imageData;
uchar *data_gray;
data_gray=(uchar* )gray->imageData;
int step_g=gray->widthStep;
int step=img->widthStep;
int channels=img->nChannels;
for(int i=0;iheight;i=i++)
{
for(int j=0;jwidth;j++)
{
/////////////exracting white
if( (data[i*step+j*channels+0]>200) && (data[i*step+j*channels+1]>200) && (data[i*step+j*channels+2]>220) )
data_gray[i*step_g+j] = 255;
else
data_gray[i*step_g+j] = 0;
}
}
// find counters in the gray image - object detection
cvFindContours( gray, storage, &contours, sizeof(CvContour),
CV_RETR_EXTERNAL, CV_CHAIN_APPROX_SIMPLE , cvPoint(0,0) );
double area;
double p;
double metric_s,metric_c;
// loop through all counturs
for( ; contours != 0; contours = contours->h_next )
{
area=fabs( cvContourArea(contours,CV_WHOLE_SEQ ) );
p=fabs( cvArcLength( contours, CV_WHOLE_SEQ, -1) );
// determine metric for circle
metric_c=area*4*3.14/(p*p);
metric_s=area*16/(p*p);
if(metric_c > 0.75f && metric_s > 1.0f)
printf(" circle \n");
else if(metric_s > 0.9f && metric_c < 0.8f )
printf(" square \n");
else
printf(" nothing ");
printf("area = %lf perimeter=%lf metric_c=%lf metric_s=%lf\n",p,area,metric_c,metric_s);
}
cvShowImage("win1",img);
cvShowImage("win2",gray);
cvWaitKey(0);
cvDestroyWindow("win1");
cvDestroyWindow("win2");
cvReleaseImage(&img);
cvReleaseImage(&gray);
//printf("Hello World!\n");
return 0;
}
#include "cv.h"
#include "cxcore.h"
#include "highgui.h"
#include < math.h >
int main(int argc, char* argv[])
{
IplImage* img=0;
IplImage* gray=0;
CvMemStorage* storage = cvCreateMemStorage(0);
CvSeq* contours;
img=cvLoadImage("shape.jpg");
if(img==NULL)
{
printf("Error in opening image\n");
return -1;
}
cvNamedWindow("win1",1);
cvNamedWindow("win2",1);
gray = cvCreateImage( cvSize(img->width, img->height), IPL_DEPTH_8U, 1 );
cvCvtColor(img,gray,CV_BGR2GRAY );
uchar *data;
data=(uchar* )img->imageData;
uchar *data_gray;
data_gray=(uchar* )gray->imageData;
int step_g=gray->widthStep;
int step=img->widthStep;
int channels=img->nChannels;
for(int i=0;i
{
for(int j=0;j
{
/////////////exracting white
if( (data[i*step+j*channels+0]>200) && (data[i*step+j*channels+1]>200) && (data[i*step+j*channels+2]>220) )
data_gray[i*step_g+j] = 255;
else
data_gray[i*step_g+j] = 0;
}
}
// find counters in the gray image - object detection
cvFindContours( gray, storage, &contours, sizeof(CvContour),
CV_RETR_EXTERNAL, CV_CHAIN_APPROX_SIMPLE , cvPoint(0,0) );
double area;
double p;
double metric_s,metric_c;
// loop through all counturs
for( ; contours != 0; contours = contours->h_next )
{
area=fabs( cvContourArea(contours,CV_WHOLE_SEQ ) );
p=fabs( cvArcLength( contours, CV_WHOLE_SEQ, -1) );
// determine metric for circle
metric_c=area*4*3.14/(p*p);
metric_s=area*16/(p*p);
if(metric_c > 0.75f && metric_s > 1.0f)
printf(" circle \n");
else if(metric_s > 0.9f && metric_c < 0.8f )
printf(" square \n");
else
printf(" nothing ");
printf("area = %lf perimeter=%lf metric_c=%lf metric_s=%lf\n",p,area,metric_c,metric_s);
}
cvShowImage("win1",img);
cvShowImage("win2",gray);
cvWaitKey(0);
cvDestroyWindow("win1");
cvDestroyWindow("win2");
cvReleaseImage(&img);
cvReleaseImage(&gray);
//printf("Hello World!\n");
return 0;
}
for(int i=0;iheight;i=i++)
ReplyDelete{
for(int j=0;jwidth;j++)
{.........
error --> undeclared indentifier variabel iheigtht and jwidth
tigerdota, i guess u have to declare it yourself in the begining depending on the size of the image u'r using. or u can use img->width and img->height.
ReplyDeleteCan you please give some example to extract width of rectangle that identified using opencv?
ReplyDeleteHello Ritesh thanks for posting this as I am new to image processing and using openCV on VS 2008, can u tell me about the error that I am getting at
ReplyDeletefor(int i=0;iheight;i=i++)
{
for(int j=0;jwidth;j++)
{.........
error --> undeclared indentifier variabel iheigtht and jwidth
unable to solve that problem. Kindly help