Hi Priya, this implements bandpass filtering on an image.
If you have the Image Processing Toolbox, do:
h = [-1 1; 1 1];
freqz2(h);
You'll see that this is a bandpass filter (and as David Young correctly points out in his comment -- I incorrectly labeled it as highpass initially).
Contrast it with a lowpass filter:
Lo =[ -0.0106 0.0329 0.0308 -0.1870 -0.0280 0.6309 0.7148 0.2304];
Lo = Lo'*Lo;
freqz2(Lo);
Or a highpass filter
hi = [-0.2304 0.7148 -0.6309 -0.0280 0.1870 0.0308 -0.0329 -0.0106];
hi = hi'*hi;
freqz2(hi);
Thanks to David for his correction.
