Hello,
I'm trying to use the contourArea fonction in ordre to remove the "too small" shapes but when I'm running the above code I'm obtaining this king of results : "contour 1 color 125 area 1" or more generally "countour n color x area n". So si there someone having an idea about why I obtain the number of the contour instead of the real area delimitate by the contour ?
Thank you all by advance
#include
#include
#include
#include
#include
#include
using namespace cv;
using namespace std;
void drawStuff(int, void*);
void showInputWindow();
void showCannyWindow();
void showContourWindow();
int lowThreshold;
int const max_lowThreshold = 100;
const char* window_name = "Edge Map";
int thresh = 40;
int max_thresh = 120;
Mat img_rgb,img_gray,img_bw,canny_output,drawing;
int main(int argc, char *argv[]){
img_rgb = imread(argv[1]);
blur( img_rgb, img_rgb, Size(3,3) );
namedWindow( window_name, WINDOW_AUTOSIZE );
cv::createTrackbar( "Min Threshold:", window_name, &lowThreshold, max_lowThreshold, drawStuff );
drawStuff(0,0);
cv::waitKey(0);
}
void drawStuff(int, void*){
vector> contours;
vector hierarchy;
Canny( img_rgb, canny_output, lowThreshold, lowThreshold*2, 3 );
cv::dilate(canny_output, canny_output, cv::Mat(), cv::Point(-1,-1));
showCannyWindow();
findContours( canny_output, contours, hierarchy, CV_RETR_TREE, CV_CHAIN_APPROX_SIMPLE, Point(0, 0) );
drawing = Mat::zeros( canny_output.size(), CV_8UC3 );
vector approxShape;
vector areas;
for(size_t i = 0; i < contours.size(); i++){
approxPolyDP(contours[i], approxShape, arcLength(Mat(contours[i]), true)*0.04, true);
areas.push_back(contourArea(contours[i],false));
drawContours(drawing, contours, i, Scalar((i+1)*10%255, (i+1)*10%255, (i+1)*10%255), CV_FILLED); // fill one gray per contour
printf("contour %d color %d area%d\n",i,(i+i)*10%255,areas[i]);
}
//cv::fastNlMeansDenoising(img_rgb,contours,3,7,21);
showContourWindow();
}
void showInputWindow(){
cv::namedWindow("InputImage");
cv::imshow("InputImage",img_rgb);
}
void showCannyWindow(){
cv::namedWindow("Canny");
cv::imshow("Canny",canny_output);
}
void showContourWindow(){
cv::namedWindow("Fill");
cv::imshow("Fill",drawing);
}
↧
