c++ - getting the object's skeleton

Question

I am using the code to get the skeleton of an object from this article: http://felix.abecassis.me/2011/09/opencv-morphological-skeleton/

here is the code:

Mat img;
img = imread("C:\mel.bmp");

cv::threshold(img, img, 127, 255, cv::THRESH_BINARY);
cv::Mat skel(img.size(), CV_8UC1, cv::Scalar(0));
cv::Mat temp;
cv::Mat eroded;

cv::Mat element = cv::getStructuringElement(cv::MORPH_CROSS, cv::Size(3, 3));

bool done;
do
{
    cv::erode(img, eroded, element);
    cv::dilate(eroded, temp, element); // temp = open(img)
    cv::subtract(img, temp, temp);
    cv::bitwise_or(skel, temp, skel);
    eroded.copyTo(img);
    done = (cv::countNonZero(img) == 0);
} while (!done);

cv::imshow("result", skel);

cvWaitKey(0);

but i have error:

Error: Sizes of input arguments do not match (The operation is neither 'array op array' (where arrays have the same size and type), nor 'array op scalar', nor 'scalar op array') in cv::binary_op

Can you please tell me why this error appears and how to solve it?

Answer 1

等待大神答复