How to select 100 highest coefficient from Curvelet subband image

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.

Answer 1

[Thomas Koelen]

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);

[Prema]

Thank u. It works fine.

[ikram loued]

hi , please who knows how can i get the coefficients of curvelet transform from an image ?

Answer 2

[Durgesh Naik]

actually im applied 3 level curvelet decomposition but its not working pls reply..(See paper)