finding the centre line of the binary image

Hi,

I have been trying to find the mid points of the white pixel in binary image so that I can draw a horizontal centre line.

As shown in the below image.So I'm thinking that I can find the right and left side points and then from there I can find the middle point for each row and this will create a multiple points which will alow me to dwar a centre line.

please if any one would be happy to help me that would be great. Thanks in advance

This is the image that I have.

Answer 1

[Image Analyst]

Try

[rows, columns] = size(binaryImage);
leftEdges = nan(rows, 1);
rightEdges = nan(rows, 1);
for row = 1 : rows
    t = find(binaryImage(row, :), 1, 'first');
    if ~isempty(t)
        leftEdges(row) = t;
        rightEdges(row) = find(binaryImage(row, :), 1, 'last')
    end
end
midPoints = (leftEdges + rightEdges) / 2;;

[Lord Thabet]

binaryImage = imread('')
[rows, columns] = size(binaryImage);
leftEdges = nan(rows, 1);
rightEdges = nan(rows, 1);
for row = 1 : rows
    t = find(binaryImage(row, :), 1, 'first');
    if ~isempty(t)
        leftEdges(row) = t;
        rightEdges(row) = find(binaryImage(row, :), 1, 'last')
    end
end
midPoints = (leftEdges + rightEdges) / 2;
imshow(binaryImage);
hold on 
plot(midPoints, '*')

This is the code that I ran,

I got this output.

To analyze that the behaviour of the line looks right, the plotting position is not.

[Lord Thabet]

The plotting position of these points are not correct. Could you please advice me with an alternative code that makes it correct.

Thanks again.

[Lord Thabet]

If you could please help me shift the points so that I can plot it acurately into the white pixel.

Thanks.

[Image Analyst]

Looks like x and y are flipped. Try

x = 1:rows
plot(x, midPoints, '*')

[Lord Thabet]

Thank you so much that did help.