How to use threshold in this problem?

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muhammad ismail
muhammad ismail 2015-1-23
评论： Alessandro Masullo 2015-1-23
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?

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Alessandro Masullo
Alessandro Masullo 2015-1-23
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;
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muhammad ismail
muhammad ismail 2015-1-23
编辑：muhammad ismail 2015-1-23
Ok now I understood. Thank you very much for your great explanation. By the way I have last question for you. How to display gray level like image above. Sorry I'm newbie in matlab.
Alessandro Masullo
Alessandro Masullo 2015-1-23
I just used imagesc(c). You can use different colormaps instead of the grey levels, use:
colormap jet
help colormap

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Image Analyst
Image Analyst 2015-1-23
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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