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Why my plot doesn't seem correct?

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Stelios Fanourakis
Stelios Fanourakis on 10 Oct 2019
Hi
I am using a binary image of white and black pixels (see attached image). I want to plot the white area of pixels so I am using a code to count from top white pixel to the last white pixel of the pic.
heights = zeros(1, columns);
for col = 1 : size(seg,2)
thisColumn = seg(:, col);
topRow = find(thisColumn, 1, 'first');
bottomRow = find(thisColumn, 1, 'last');
heights(col) = bottomRow - topRow; % Add 1 if you want.
end
plot(heights(:))
But plot doesn't seem right (see attached image). it should had the form and shape of the white area of the image, means a rectangle with a steep bottom.
Any reason why plot doesn't seem correct?
Thanks
  3 Comments
Stelios Fanourakis
Stelios Fanourakis on 12 Oct 2019
Yeah sorry for the inconveniece but at the end I think it's correct. The white area of the image begins just underneath the title "Global Region -Based Segmentation". So the plot should like an horizontal line but it looks like a vertical one. However, if you notice the vertical line of the axes in the plot you'll see that this sharp vertical transition is only a pixel from 30-31 and it may belong to those little discrepancies of one pixel that are apparent a bit left of the real image. So I assume the plot is eventually correct. Thanks for your time

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