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a64b51dd94
Usage of imread(): magic number 0, unchecked result * docs: rewrite 0/1 to IMREAD_GRAYSCALE/IMREAD_COLOR in imread() * samples, apps: rewrite 0/1 to IMREAD_GRAYSCALE/IMREAD_COLOR in imread() * tests: rewrite 0/1 to IMREAD_GRAYSCALE/IMREAD_COLOR in imread() * doc/py_tutorials: check imread() result
40 lines
1.0 KiB
C++
40 lines
1.0 KiB
C++
#include "opencv2/imgproc.hpp"
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#include "opencv2/highgui.hpp"
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using namespace cv;
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using namespace std;
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int main( int argc, char** argv )
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{
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Mat src;
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// the first command-line parameter must be a filename of the binary
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// (black-n-white) image
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if( argc != 2 || !(src=imread(argv[1], IMREAD_GRAYSCALE)).data)
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return -1;
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Mat dst = Mat::zeros(src.rows, src.cols, CV_8UC3);
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src = src > 1;
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namedWindow( "Source", 1 );
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imshow( "Source", src );
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vector<vector<Point> > contours;
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vector<Vec4i> hierarchy;
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findContours( src, contours, hierarchy,
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RETR_CCOMP, CHAIN_APPROX_SIMPLE );
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// iterate through all the top-level contours,
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// draw each connected component with its own random color
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int idx = 0;
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for( ; idx >= 0; idx = hierarchy[idx][0] )
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{
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Scalar color( rand()&255, rand()&255, rand()&255 );
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drawContours( dst, contours, idx, color, FILLED, 8, hierarchy );
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}
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namedWindow( "Components", 1 );
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imshow( "Components", dst );
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waitKey(0);
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}
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