# FbCrop

## PURPOSE

Crop a 2D filterbank (adjusting filter norms).

## SYNOPSIS

function FBC = FbCrop( FB, delta )

## DESCRIPTION

     Crop a 2D filterbank (adjusting filter norms).

     Takes a filter bank and crops it by cropping off delta pixels from each
     side. Ensures that the mean response of each filter is 0 and that the L1
     norm is 1, i.e. sum(sum(abs(F)))==1.

     USAGE
      FBC = FbCrop( FB, delta )

     INPUTS
      FB       - original filterbank
      delta    - amount to crop by

     OUTPUTS
      FBC      - cropped filterbank

     EXAMPLE
      load FbDoG.mat;  FBC=FbCrop(FB,4);
      figure(1); montage2(FB,struct('extraInfo',1));
      figure(2); montage2(FBC,struct('extraInfo',1));

     See also FBAPPLY2D

     Piotr's Image&Video Toolbox      Version 2.0
     Copyright 2012 Piotr Dollar.  [pdollar-at-caltech.edu]
     Please email me if you find bugs, or have suggestions or questions!
     Licensed under the Simplified BSD License [see external/bsd.txt]