Calculate length of white pixels in binary image

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Ritwik Dhar
Ritwik Dhar 2019-7-31
编辑： KALYAN ACHARJYA 2019-7-31
bbbb.PNG
I want to calculate the length in pixels of the white pixels at the bottom of the image assuming it is a line without breaks without manually using imdist tool.
Thanks in advance.
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Michael Madelaire
Michael Madelaire 2019-7-31
You should include a data file, such that people willing to help can have a look.
Additionally tou should state some constratints. Is a line only defined if the as being the same row? or can it be diagonally displaced? If so, then how much?

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回答（2 个）

Eva-Maria Weiss
Eva-Maria Weiss 2019-7-31
Hi!
Assuming that approximating the lineshape structure in the bottom area of your oicture as a line you could try the following
  1. Extract the bottom part of your pictur
subFrame = yourPic(rowmiddl:end,:)
2. Now you can find the indices of white pixels by
idx = find(subFrame) %looks for non-zero elements, returns a list
3. Convert linea indexing to subscripts by
[r,c] = ind2sub(size(subFrame),idx)
4. The next step could simply mathematically solved by pythagoras?
qNumbPix = (r(end)-r(1))^2 + (c(end)-c(1))^2
NumbPix = sqrt(qNumbPix
I hope this will help!
Good Luck!
KALYAN ACHARJYA
KALYAN ACHARJYA 2019-7-31
编辑：KALYAN ACHARJYA 2019-7-31
Lets, image_bw is the binary image.(Please not your enclosed image have white boundary, I ignored that)
se=strel('disk',4);
result=imdilate(image_bw,se);
result=bwareafilt(result,1,'Largest');
result=imerode(result,se);
figure,imshow(result);
Next: Find the maximum distance between two white pixels, number of similar question already answered by @ImageAnalyst and @Walter, please do search see here too.
I hope you can do that, please try if not, let me know.

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