MATLAB: How to identify a particular shape at all degrees, while ignoring the rest

digital image processingimage acquisitionimage analysisimage processingimage segmentationMATLABshape recognition

Hello, I have an image of various lines and blobs, and I want my image to only show the lines. To accomplish this, I have utilized watershed, regionprops, ismember, and a few other methods in order to get to the image I am now. At this point, I can't reduce the area boundries, as I'll start losing lines before I lose the blobs, and solidity wouldn't accomplish anything as all of the shapes appear to have the same solidity (probably due to how the shapes were generated.) What options do I have left? Thanks in advance!

Best Answer

Try the ratio of the majoraxislength to minoraxisLength.

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First I'd get a first shot at the mask by thresholding. Luckily much of the surround is white so thresholding will get the bottom and sides. Then I might try a texture filter, like stdfilt(), because you know your object of interest is rough while the curved bars/rods behind it are smooth. Then threshold that texture mask and AND it with your intensity thresholding mask. If that doesn't work, post the code for it and we can start tweaking it.

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MaskIm = imread('text.png');
Sat1=regionprops(MaskIm, {'Area', 'Eccentricity', 'EulerNumber', 'MajorAxisLength', 'MinorAxisLength', 'Orientation', 'Perimeter'});
AR = [Sat1.MajorAxisLength]./[Sat1.MinorAxisLength] ;
[Sat1.AspectRatio] = deal(AR) ;

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