SDFILTER  Create convolution filter bank

     F=SDFILTER(NAME,options)

 INPUTS
   NAME   String name of a filter
    'LM'   Leung-Malik bank (multi-scale/multi-orientation), 48 filters,block:49
    'RFS' Root Filter Set bank (38 multi-scale/multi-orient.filters),block:49
    'S'   Schmid filter bank (13 rotationally-invariant filters)

 OUTPUTS
   F      3D filter matrix (block size x block size x number of filters)

 OPTIONS
   'figure'   Open a figure and visualize individual filters
     'rows',M  Specify number of rows for the figure
     'cols',N  Specify number of columns for the figure

 REFERENCES
 T. Leung and J. Malik. Representing and recognizing the visual appearance
 of materials using three-dimensional textons. Int. Journal of Computer
 Vision, 43(1):29-44, 2001

 C. Schmid. Constructing models for content-based image retrieval. In
 Proc.of the IEEE Conf. on Computer Vision and Pattern Recognition, vol.2,
 pp.39-45, 2001

 J.M. Geusebroek, A.W.M. Smeulders and J. van de Weijer. Fast Anisotropic
 Gauss Filtering. IEEE Trans.on Image Processing, 12(8):938-943, 2003

 DESCRIPTION
 SDFILTER creates a filter bank