ContCode - Palmprint Feature Representation

% USAGE:
% 1. C = ContCode(I,k)
% 2. C = ContCode(I,k,D_f,P_f)
% INPUTS:
%
% I--------------> Input Image
% k--------------> Order of Directional Filters (k>=2)
% D_f(Optional)--> Name of the Directional Filter (Refer to NSCT Toolbox, Default: 'sinc')
% P_f(Optional)--> Name of the Pyramidal Filter (Refer to NSCT Toolbox, Default: 'pyrexc')
%
% OUTPUTS:
%
% C----> Contour Code Representation of 'I'
%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% Please cite the following paper in all works using this code.
% Zohaib Khan, Ajmal Mian and Yiqun Hu, "Contour Code: Robust and efficient multispectral palmprint encoding for human recognition," Computer Vision (ICCV), 2011 IEEE International Conference on , vol., no., pp.1935-1942, 6-13 Nov. 2011%
% IMPORTANT NOTE:
%
% This function requires 'NSCT Toolbox', installed before use.
% Downloadable from:
% http://www.mathworks.com/matlabcentral/fileexchange/10049
% (Please refer to the Readme.txt of the NSCT toolbox to make it working)
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%