Opencv corners detection for High resolution images

Question

I've just implemented corner detection using OpenCV and i got the corner value as zero.i use 3488*2616 resolution camera images.it is there any proper way to find the corner detection for high resolution images.i d'not know where i did my mistake.Here with i've attached my code and images also.please help me.i'm very new to opencv.sorry for my English.

int board_w = 6;
int board_h = 6;
const int MAX_CORNERS = 500;

int main()
{

    int board_n = (board_w-1) * (board_h-1);
    CvSize board_sz = cvSize( board_w-1, board_h-1 );


    CvPoint2D32f* corners = new CvPoint2D32f[board_n];
    int cornerCount = 0;

    IplImage *image = cvLoadImage("myimage.jpg");
    IplImage *gray_image = cvCreateImage(cvGetSize(image),8,1);
    cvCvtColor(image, gray_image, CV_BGR2GRAY );
const int N = cvFindChessboardCorners(gray_image,board_sz,&corners[0],&cornerCount,10);


    cvFindCornerSubPix(gray_image,&corners[0],cornerCount,cvSize(3,3),cvSize(-1,-1),cvTermCriteria(CV_TERMCRIT_EPS,0,.01)); 

    printf("\ the count was:%d \n",cornerCount);
    for (int i = 0; i < cornerCount; i++)
    {
cvCircle (image, cvPointFrom32f (corners[i]), 3, CV_RGB (0, 0, 255), 2);

    }

        cvNamedWindow("firstframe");            
        cvShowImage("firstframe",image);
        cvWaitKey(0);
    cvReleaseImage(&image);
    cvReleaseImage(&gray_image);



}

The code will work for normal chessboard images.but while using real time camera images with that resolution it ll not works.please help me.thanks in advance. enter image description here

Ya...Sure...Sorry for that tat one...i'll correct it.. – aranga Jun 02 '12 at 06:48 — aranga, Jun 02 '12 at 06:48

score 0 · Answer 1 · answered Jun 01 '12 at 12:29

0

If you suspect that detection is really failing simply because you are using high resolution images, you can always cvResize() your IplImage to a smaller size and verify your observation.

answered Jun 01 '12 at 12:29

karlphillip

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Thanks for your reply...When i Resize the image i got the corners but i need to use that corner point for calibration...is it affect my calibration results.?? – aranga Jun 02 '12 at 06:52

Opencv corners detection for High resolution images

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