Implement Algorithm 15.1 from Forsyth and Ponce as the following Matlab function:

function [line_img,lines] = CV_incremental_line(im)
%
%CV_incremental_line - segment straight lines in an image
%On input:
%     im (mxn array): input image
%On output:
%  line_img (mxn array): line image (pixels in line n are labeled n)
%  lines (kx3): line parameters (a,b,c)
%Call:
%  [line_img,lines] = CV_incremental_line(im1);
%Author:
%  Your name
%  UU
%  Fall 2012
%