how to get the cooridinate of the lowest point on the circumference of an area in image processing?

I have to find the lowest point on the circumference of the droplet in the attached image. The droplet shape can be circular/oblate/prolate. So how can I find the coordinate of the lowest point on the drop circumference?

Answer 1

[Ameer Hamza]

Try this code

im = imread('droplet.png');
im_gray = rgb2gray(im);
im_bin = imbinarize(im_gray);

regions = bwconncomp(im_bin);
PxlList = regions.PixelIdxList{2}; % first list is for white region on edges
[r,c] = ind2sub(size(im_bin), PxlList);
[lowest_y, idx] = max(r);
lowest_x = c(idx);

imshow(im_bin)
hold on;
plot(lowest_x, lowest_y, 'r+', 'LineWidth', 2, 'MarkerSize', 10);

[Anjan Goswami]

Thanks a lot, Hamza.

[Ameer Hamza]

I am glad to be of help.