Detection of lines from an Image

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Image.Processor
Image.Processor 2017-10-6
评论： Walter Roberson 2017-10-9
Hello I have an image from which many lines are being dropping down from top to bottom.. some are straight and some are random. I have a code that works well but the problem is it detects only 10 to 15% of the lines from top to bottom and rest of them are just blank pixels nothing is detected. Can you suggest me what should I do to detect all the lines. PS: Image is very clear and lines are very clear on the image.
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Image.Processor
Image.Processor 2017-10-8
@Walter Roberson.. Yes you are right, I will make an assumption that the lines are continues and there are no sharp breaks or else I will try to fit some points where there are breaks. But as I said in my above comment for now I am concerned with the lengths of lines until they are pretty straight.
Walter Roberson
Walter Roberson 2017-10-9
Unfortunately the sample image appears to have disappeared.

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Image Analyst
Image Analyst 2017-10-8
I'd first correct for the background by dividing by a blank one. If you can't do that then I'd try a bottom hat filter, imbothat(), or adapthisteq(), so that you can get to an image that you can threshold to get a binary image.
binaryImage = filteredImage < threshold;
Then I'd erode the binary image to get rid of the little lines and have just the big black thing at the top.
bigBlob = imerode(binaryImage, ones(5));
Then I'd use that to subtract from the original binary image so that now you're just left with a binary image of the fibers.
binaryImage = binaryImage & ~bigBlob;
Then I'd skeletonize them with bwmorph()
binaryImage = bwmorph(binaryImage, 'skel', inf);
and then call regionprops to get the area, which for skeletons is the length of the skeletonized line.
props = regionprops(binaryImage, 'Area');
allLengths = [props.Area];
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Image.Processor
Image.Processor 2017-10-8
Thanks I would check that and surely will come back to you with further question and to accept your answer :)
Image.Processor
Image.Processor 2017-10-9
Hi Image Analyst. I have tried a lot but I can not find the way to get that. Is it possible for you to give me a sample code for what you explained. I am new may be I am making a lots of mistakes. Thank you so much.

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