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Using 'ismember' against multiple sets of parameters

Asked by Kim Yu Jo

Kim Yu Jo (view profile)

on 4 Jan 2013

Hi there,

I'm trying to find two sets of parameters (Keeper_Indexes 1 & 2), and locate them on an image (Labeled_Image):

Keeper_Indexes1=find( 0.7 < para1 & para1 < 0.72);
Keeper_Indexes2=find( 0.9 < para1 & para1 < 0.905);
PossibleCracks1 = ismember(Labeled_Image, Keeper_Indexes1);
PossibleCracks2 = ismember(Labeled_Image, Keeper_Indexes2);
figure, imshow(PossibleCracks1,'DisplayRange', []),title('Possible Cracks1');
figure, imshow(PossibleCracks2,'DisplayRange', []),title('Possible Cracks2');

This is the current code i'm using, however, is there a way to integrate Keeper_Indexes 1 & 2 together, or to integrate two ismember functions into one? Meaning, figuratively,

Keeper_Indexes = find( 0.9 < para1 & para1 < 0.905) & find( 0.7 < para1 & para1 < 0.72);
TotalPossibleCracks = PossibleCracks1 + PossibleCracks2

Thank you for your help!

1 Comment

Sean de Wolski

Sean de Wolski (view profile)

on 4 Jan 2013

My guess is you can bypass both find() and ismember() with simple logical indexing.

Please post small example matrices (or explain how we can create sample matrixes) so that we can reproduce it.

Kim Yu Jo

Kim Yu Jo (view profile)


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1 Answer

Answer by Image Analyst

Image Analyst (view profile)

on 4 Jan 2013
Accepted answer

Yes, you can combine the lines. Just do

Keeper_Indexes = [Keeper_Indexes1, Keeper_Indexes2];
PossibleCracks = ismember(Labeled_Image, Keeper_Indexes);
imshow(PossibleCracks>0); % Binarize and display.

1 Comment

Kim Yu Jo

Kim Yu Jo (view profile)

on 4 Jan 2013

Thank you very much!! =)

Image Analyst

Image Analyst (view profile)

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