rods and disk image

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Hasan alomari 2013-12-30

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编辑： Image Analyst 2013-12-31

I have an image of rods and disk and i need to suppurate the rods only using morphological processing i need the mean steps only

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Answer 1

Image Analyst 2013-12-30

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You forgot to post your image. I don't know how you define "mean steps". Please explain.

If the image looks like what I'm imagining, something like pencils and coins, or this:

Then I'd threshold and call regionprops and look at the ratio of the major to minor axis. If the ratio is high, it's a rod. If the ratio is less than about 2, it's a disc.

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Image Analyst 2013-12-30

I'd look for objects with a solidity close to 1 and a major to minor axis ratio close to 1. That will be the circles. Everything else will be rods or rod/disc overlap.

Hasan alomari 2013-12-31

编辑：Image Analyst 2013-12-31

在 MATLAB Online 中打开

make opening with disk the subtract it from the original image, like this

I=imread('Untitled.jpg');
I=I(:,:,1);
str= strel('disk',4);
Im=imopen(I,str);
rotI = imrotate(Im,33,'crop');
BW = edge(rotI,'canny');
[H,T,R] = hough(BW);
P  = houghpeaks(H,5,'threshold',ceil(0.3*max(H(:))));
lines = houghlines(BW,T,R,P,'FillGap',5,'MinLength',7);
str2=strel('line',3, 10);
im=I-Im;
im2=imclose(im,str2);
imshow(im2)