How do I know the length from the center of the object to the vertical axis edge and the horizontal axis edge?

Here's a picture of the pill, you can see that it's not a circle. I want to know the length from the center to the vertical axis edge and the horizontal axis edge

Answer 1

[Bora Eryilmaz]

You can do something along these lines, where the location of the centroids seems like what you want:

I = imread('image.jpeg');
Ibw = im2bw(I);
Ilabel = bwlabel(Ibw);

stat = regionprops(Ilabel,'centroid');

imshow(I);
hold on;
for i = 1:numel(stat)
    plot(stat(i).Centroid(1), stat(i).Centroid(2), 'ro');
    stat(i)
end

ans = struct with fields:
    Centroid: [961.5471 479.7054]

ans = struct with fields:
    Centroid: [956.8800 409.4163]

ans = struct with fields:
    Centroid: [951 63]

ans = struct with fields:
    Centroid: [997 448]

[Image Analyst]

Or

xyCentroids = vertcat(stats); % N by 2 array. x in column 1, y in column 2
% Or if you want them in separate vectors:
xCentroids = xyCentroids(:, 1);
yCentroids = xyCentroids(:, 2);