Detecting touching objects

[imsanjoykb]

include <opencv2/opencv.hpp>

include

using namespace cv; using namespace std;

int main() { cv::Mat src = cv::imread("cards.jpg"); if (!src.data) return -1;

imshow("src", src);

// Create binary image from source image
cv::Mat bw;
cv::cvtColor(src, bw, CV_BGR2GRAY);

cv::threshold(bw, bw, 40, 255, CV_THRESH_BINARY | CV_THRESH_OTSU);
imshow("bin", bw);

// Fill holes
cv::floodFill(bw,cv::Point2i(0,0),cv::Scalar(1));
for(int i=0;i<bw.rows*bw.cols;i++)
{
    if(bw.data[i]==0)
        bw.data[i]=255;
}

cv::threshold(bw, bw, 40, 255, CV_THRESH_BINARY | CV_THRESH_OTSU);

imshow("filled", bw);

cv::Mat dist;
cv::distanceTransform(bw, dist, CV_DIST_L2, 3);
cv::normalize(dist, dist, 0, 1., cv::NORM_MINMAX);
imshow("Distance Transform Image", dist);

cv::threshold(dist, dist, .5, 1., CV_THRESH_BINARY);

// // Dilate a bit the dist image // Mat kernel1 = Mat::ones(7, 7, CV_8UC1); // dilate(dist, dist, kernel1); // erode(dist, dist, kernel1); // imshow("Peaks", dist);

// Create the CV_8U version of the distance image
// It is needed for cv::findContours()
cv::Mat dist_8u;