# jmlipman/LAID

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 % LINEDETECTORCARTESIANIMP.m - Line detector in Cartesian coordinate system % % This code implements a line detector using Cartesian coordinate system. % This improved version works for all cases. % It iterates over each pixel and determine all its % prospective lines. The final line will be the one found in the % accumulator with the maximum value. % % You can do with this code whatever you want. The main purpose is help % people learning about this. Also, there is no warranty of any kind. % % Juan Miguel Valverde Martinez % http://laid.delanover.com clear;clc; inputimage = double(rgb2gray(imread('edges2.png'))); %image size [rows,columns]=size(inputimage); %accumulator acc1=zeros(rows,181); acc2=zeros(columns,181); % Walk through the image for x=1:columns for y=1:rows if(inputimage(y,x)==0) for m=-45:135 % change the coordinates system yInv = rows-y; b=round(yInv-tan((m*pi)/180)*x); if(b0) acc1(b,m+45+1)= acc1(b,m+45+1)+1; end % intersection in x-axis b=round(x-yInv/tan((m*pi)/180)); if(b0) acc2(b,m+45+1)= acc2(b,m+45+1)+1; end end end end end % Calculate the maxima to draw the line whose characteristics are found in % the coordinates of that maxima j1=max(max(acc1)); j2=max(max(acc2)); if j1>j2 [d,e]=find(acc1==j1); e = e(round(size(e,1)/2)); d = d(round(size(d,1)/2)); e = (e-46); point = round([rows-d 0]); else [d,e]=find(acc2==j2); e = e(round(size(e,1)/2)); d = d(round(size(d,1)/2)); e = (e-46); point = round([rows d]); end figure;imshow(inputimage); hold on; % Drawing the line theta = e; x = [0:.1:1000]; m = tan(theta*pi/180); y = -m*(x-point(2))+point(1); plot(x,y);