How to shrink a binary image of an irregular object?

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Yun Inn
Yun Inn 2014-3-27
评论： Yun Inn 2014-3-27
I have a binary image of an irregular object. Any clue on how to shrink this object, for example, by 20pixel from all directions?
I tried tracing the boundary and edit the coordinates but it was not practical.

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Sean de Wolski
Sean de Wolski 2014-3-27
A few ways:
doc imerode
Or if you need to maintain objects:
doc bwmorph
Look at the skel and thin options.
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Yun Inn
Yun Inn 2014-3-27
I hope it works! Anyway, thank you very much for pointing me to the right function :)

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