试试这个代码
我= imread (“droplet.png”);
im_gray = rgb2gray (im);
im_bin = imbinarize (im_gray);
区域= bwconncomp (im_bin);
PxlList = regions.PixelIdxList {2};%第一个列表是白色的边缘地区
[r、c] = ind2sub(大小(im_bin), PxlList);
[lowest_y, idx] = max (r);
lowest_x = c (idx);
imshow (im_bin)
持有在;
情节(lowest_x lowest_y,' r + ',“线宽”2,“MarkerSize”10);
