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

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Anjan Goswami 2020-5-1

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https://ww2.mathworks.cn/matlabcentral/answers/522287-how-to-get-the-cooridinate-of-the-lowest-point-on-the-circumference-of-an-area-in-image-processing

评论： Ameer Hamza 2020-5-1

droplet.png

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?

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Ameer Hamza 2020-5-1

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https://ww2.mathworks.cn/matlabcentral/answers/522287-how-to-get-the-cooridinate-of-the-lowest-point-on-the-circumference-of-an-area-in-image-processing#answer_429670

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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);