How can I get the outer most contour of the syntax (contour)?

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Shahin Safazadeh 2018-2-26

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https://ww2.mathworks.cn/matlabcentral/answers/384908-how-can-i-get-the-outer-most-contour-of-the-syntax-contour

评论： Shahin Safazadeh 2018-2-26

Using the syntax (contour), I will have 10 contours for a binary image!! and when I assign 1 in the syntax, I will get the inner most contour. How can I get the outer most contour only?

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Image Analyst 2018-2-26

编辑：Image Analyst 2018-2-26

Please attach your binary image and tell us what you want. I think you can get what you want without using contour, such as by hole filling with imfill(), or by using bwperim(), bwconvhull(), or bwboundaries() or something. It really doesn't make much sense to use contour on a binary image if you think about it.

Shahin Safazadeh 2018-2-26

mask.zip

Basically, my mask is in gray scale (256). However, I converted it to binary in order to get the contour. However, I think bwperim() might works here. (I didn't know this syntax) Anyway, I attached the mask file. Please let me know how to get the largest contour instead of the perimeter pixels (if it is possible)

Thank you very much

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