# How to select 100 highest coefficient from Curvelet subband image

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Prema on 8 May 2015
Commented: ikram loued on 16 Sep 2020
Input image size is 256x256 How to calculate number of levels required for this image size. How to select 100 highest coefficient from Curvelet subband image.

Thomas Koelen on 8 May 2015
There are a couple ways you can do this depending on how you want to deal with repeated values. Here's a solution that finds indices for the 5 largest values (which could include repeated values):
[sortedValues,sortIndex] = sort(A(:),'descend');
maxIndex = sortIndex(1:5);
Here's a solution that finds the 5 largest unique values, then finds all elements equal to those values:
sortedValues = unique(A(:));
maxValues = sortedValues(end-4:end);
maxIndex = ismember(A,maxValues);
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ikram loued on 16 Sep 2020
hi , please who knows how can i get the coefficients of curvelet transform from an image ?

Durgesh Naik on 15 Jul 2015
actually im applied 3 level curvelet decomposition but its not working pls reply..(See paper)