eatcosmos's profile - activity

Learned it!

Thank you, I am also meet this problem. Does UMat can do it?

My solution for this requirement is firstly do findContours() for these points and than do drawContours() again, maybe

My solution for this requirement is firstly do findContours() for these points and than do drawContours() again, maybe

I have found some rule about this problem, this wrong line connects two point and do not cross any others contour points.

It seams that drawContours prefer convex shape, but I am not very sure about it.

std::vector<std::vector<Point>> collision_for_mask2_contours;

test for this variable, I have put it in bmp image in accessory file , you can get points from it for drawContours. Thank you very much!

G:\test.bmp

int  main(int argc, char* argv[]){

// test code for drawContours

std::vector<std::vector<Point>> collision_for_mask2_contours;
std::vector<Point> constours;
Mat_<uchar> testbmp = imread("G:/test.bmp", WINDOW_AUTOSIZE);
namedWindow("testbmp");
imshow("testbmp", testbmp);
waitKey(0); // need to press any key to continue
for (int y = 0; y < testbmp.rows; ++y) {
    for (int x = 0; x < testbmp.cols; ++x) {
        if (testbmp(y, x)) {
            constours.push_back(Point(x, y));
        }
    }
}
collision_for_mask2_contours.push_back(constours);
Mat_<uchar> testForDrawContours = Mat_<uchar>::zeros(testbmp.size());
// one case, can not get concave shape
drawContours(testForDrawContours, collision_for_mask2_contours, -1, Scalar(255));
namedWindow("testForDrawContours", WINDOW_AUTOSIZE);
imshow("testForDrawContours", testForDrawContours);
waitKey(0);
// one another case, also can not get concave shape
drawContours(testForDrawContours, collision_for_mask2_contours, -1, Scalar(255), -1, 8);
namedWindow("testForDrawContours2", WINDOW_AUTOSIZE);
imshow("testForDrawContours2", testForDrawContours);
waitKey(0);}

There is no magic, No more than doc and tutorial.

yes, you are right, I find Image file reading and writing

I understand, Thank you. Can I konw How do you know opencv contours's data structure, I find many things I do not unders

imread("G:/test.bmp", 1); yes, 1 is right to get gray image. I find drawContours must be used along with findContours,

imread("G:/test.bmp", 1); yes, 1 is right to get gray image. I find must use drawContours with findContours, maybe I hav

HI @LBerger, I have add test code for test.bmp, and showed the problem, you can test it, thank you. drawContours(tes

How to Prevent drawContours() to draw strange wrong line? I have found some rule about this problem, this wrong line c

HI @LBerger, I have add test code for test.bmp, and showed the problem, you can test it, thank you.

How to Prevent drawContours() to draw strange wrong line? I have found some rule about this problem, this wrong line c

How can I Prevent drawContours to draw extra wrong line I have found some rule about this problem, this wrong line con

How can I Prevent drawContours to draw extra wrong line I have found some rule about this problem, this wrong line con