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Re: Selecting elements in an image based on area

From: Jordi Gutiérrez Hermoso
Subject: Re: Selecting elements in an image based on area
Date: Wed, 13 Jul 2011 13:12:30 -0500

2011/7/13 Jordi Gutiérrez Hermoso <address@hidden>:
> 2011/7/13 Samuel Setchell <address@hidden>:
>> I think I have grabbed one designed for MATLAB....which had been
>> ported for mac.
> That's odd. I wonder why would someone write one of those. Both Octave
> and Matlab ship their own, and an m-file implementatino of bwlabel is
> bound to be very slow.
>> seems to work fine. I tried running regionprops.m on my output and
>> got:
>> ans =
>> {
>>  1x381 struct array containing the fields:
>>    Area
>>    Centroid
>>    BoundingBox
>> }
>> Is this correct?
> Looks like it. Now assign ans to some variable, say regions = ans;
> and do
>    idx = find([regions.Area] > lo & [regions.Area] < hi)
> to give you the indices of the regions that have area higher than your
> lower bound lo and lower than your upper bound hi. Now if imlabel is
> the outout of bwlabel, you can do
>    mask = any(bsxfun(@eq, x, reshape(idx, 1,1, length(idx))),3);

Sorry for obscuring this so much (and for using x instead of imlabel).
This is much better:

     mask = ismember(imlabel,idx);

- Jordi G. H.

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