How to use threshold in this problem?

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I convert this picture into bw using c=im2bw(b,graythresh(b)); but the problem is the straight line is disconnected as picture below. It supposed to be straight single line. What kind of segmentation technique that I need to use?

Accepted Answer

Alessandro Masullo
Alessandro Masullo on 23 Jan 2015
Supposed your image varies from o to 1, you could use a threshold in this way:
THR = 0.5
above = image>=THR;
image(above) = 1;
image(~above) = 0;
Alessandro Masullo
Alessandro Masullo on 23 Jan 2015
I just used imagesc(c). You can use different colormaps instead of the grey levels, use:
colormap jet
help colormap

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More Answers (1)

Image Analyst
Image Analyst on 23 Jan 2015
Like I said in your duplicate post, you can use imclearborder() and bwareaopen(), though there are better ways like background correction.

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