opencv 查詢連通區域 最大面積
阿新 • • 發佈：2018-12-14
#include <opencv2/imgproc.hpp> #include <opencv2/highgui.hpp> using namespace cv; using namespace std; int main( int argc, char** argv ) { Mat src = imread( argv[1] ); int largest_area=0; int largest_contour_index=0; Rect bounding_rect; Mat thr; cvtColor( src, thr, COLOR_BGR2GRAY ); //Convert to gray threshold( thr, thr, 125, 255, THRESH_BINARY ); //Threshold the gray vector<vector<Point> > contours; // Vector for storing contours findContours( thr, contours, RETR_CCOMP, CHAIN_APPROX_SIMPLE ); // Find the contours in the image for( size_t i = 0; i< contours.size(); i++ ) // iterate through each contour. { double area = contourArea( contours[i] ); // Find the area of contour if( area > largest_area ) { largest_area = area; largest_contour_index = i; //Store the index of largest contour bounding_rect = boundingRect( contours[i] ); // Find the bounding rectangle for biggest contour } } drawContours( src, contours,largest_contour_index, Scalar( 0, 255, 0 ), 2 ); // Draw the largest contour using previously stored index. imshow( "result", src ); waitKey(); return 0; }