How to use threshold in this problem?

1 view (last 30 days)
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;
  6 Comments
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

Sign in to comment.

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.

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!