How to find quantize, flooring and mod 2 of an image

I have decomposed/ generated the coefficient matrices of the level-one approximation (LL) and horizontal (LH), vertical (HL) and diagonal features (HH) of an image with the following code line:

    figure
    subplot (2,2,1);
    imshow(LL,[]); 
    title('LL subband-Approximation');

and similarly for LH, HL, HH band.

Now my problem is:

(i) separate LL out and quantify it to [0,255]. (ii) Then implement following term:

LL'(subscript i,j)= floor[LL (subscript i,j)/2^k] mod 2

where 0<=K<=7 and subscript i,j are 128*128.

How can this be implemented in MatLab. Please provide me the code.

Answer 1

[Walter Roberson]

Quantize:

minLL = min(LL(:));
maxLL = max(LL(:));
halfLL = minLL + (maxLL - minLL)/2;

qLL = 255*(LL > halfLL);