what is the best way for thresholding this image .....please?

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mmm ssss 2012-1-24

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/26985-what-is-the-best-way-for-thresholding-this-image-please

i wrote this code {

       img=imread(..........);
       imshow(img);  
     medimage=medfilt2(img,[5 5]);%median Filtering image
       figure,imshow(medimage);
       z=adapthisteq(medimage);
       figure,imshow(z);
            H = fspecial('unsharp');
            y=imfilter(z,H);
            figure,imshow(y);
            s=roipoly(y);
      nnew=img.*cast(s,class(img));
       figure,imshow(nnew);
}

the result was similar to this

http://www.2shared.com/photo/C1kAyu-f/vc_online.html

how i can do thresholding to make the veins obvious with white color at a black background.

help please , i am really needs this? simple reply will be most suitable to me

i am just a new in the matlab world.

thanks

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David Young 2012-1-25

Thank you, that's helpful and I can see what your code so far does. However, with apologies, I have to tell you that the next step is not obvious - picking out the veins is a mini-project.

mmm ssss 2012-1-25

i thanks you for your cooperation with me so much, but i didnot undestand your last comment.

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回答（1 个）

Image Analyst 2012-1-25

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/26985-what-is-the-best-way-for-thresholding-this-image-please#answer_35156

Did you already ask that and I answer that in http://www.mathworks.com/matlabcentral/answers/26663-adaptive-local-thresholding-for-gray-scale-image?

Did you search http://iris.usc.edu/Vision-Notes/bibliography/contentsmedical.html#Medical%20Applications,%20CAT,%20MRI,%20Ultrasound,%20Heart%20Models,%20Brain%20Models to find papers such at this: Garbey, M., Merla, A., Pavlidis, I., Estimation of blood flow speed and vessel location from thermal video, CVPR04(I: 356-363).

It's not that you're annoying, it's more about aligning expectations. We can't do more than a few minutes of coding for you - we simply don't have the time to do lengthy, free, private consulting for anybody. For example if you need help with the adapthisteq() function, (which is the first step in adaptive local thresholding that you say you want to do - I've already mentioned that, did you try it?) we might be able to provide a demo beyond what the help does, if you provide an image. That would only be a few minutes work, not hours or days of work. So, now, let me see your adapthisteq() code and the results.

mmm ssss 2012-1-29

thanks for all your valuable time for comments

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MATLAB Mathematics Fourier Analysis and Filtering

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