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Original drawing
6*9
6*6
6*5
Why can't we detect any shape ???
as 5*X Can't detect it
At least 6*5 and 6 Not change , Otherwise, it will not be detected
#include <opencv.hpp> using namespace cv; using namespace std; int main() {
// Blob Operator parameters SimpleBlobDetector::Params params; /*params.minThreshold = 10;
params.maxThreshold = 200;*/ params.maxArea = 10e4; params.minArea = 10e1;
params.filterByArea = true; /*params.minDistBetweenBlobs = 5;
params.filterByInertia = false; params.minInertiaRatio = 0.5;*/
Ptr<FeatureDetector> blobDetector = SimpleBlobDetector::create(params); Mat img
= imread("circels.jpg",0); vector<Point2f> centers; Size patternSize(6, 9); Mat
dst, img_size; //resize(img, img_size, Size(round(img.cols * 4), round(img.rows
* 4)), 0, 0); //resize(img, img_size, Size(img.cols * 4,img.rows * 4));
threshold(img, img, 120, 255, THRESH_BINARY); // Extracting the center of a circle //bool found =
findCirclesGrid(img, patternSize, centers, CALIB_CB_SYMMETRIC_GRID,
blobDetector); bool found = findCirclesGrid(img, patternSize, centers,
CALIB_CB_SYMMETRIC_GRID | CALIB_CB_CLUSTERING, blobDetector); Mat cimg;
cvtColor(img, cimg, COLOR_GRAY2BGR); drawChessboardCorners(cimg, patternSize,
centers, found); double sf = 960. / MAX(img.rows, img.cols); resize(img, img,
Size(), sf, sf, INTER_LINEAR_EXACT); resize(cimg, cimg, Size(), sf, sf,
INTER_LINEAR_EXACT); imshow(" original image ", img); imshow("corners", cimg); waitKey();
return 0; }
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