Difference between MATLAB hough and my implementation -


i trying recreate matlab's hough function mine. code follows

function [h,t,r] = my_hough(x,dr,dtheta)     rows = size(x,1);     cols = size(x,2);     d = sqrt((rows - 1)^2 + (cols - 1)^2);     nr = 2*(ceil(d/dr)) + 1;     diagonal = dr*ceil(d/dr);     r = -diagonal:dr:diagonal;     t = -90:dtheta:90-dtheta;     ntheta = length(t);     h = zeros(nr,ntheta);     = 1:ntheta         n1 = 1:rows             n2 = 1:cols                 if x(n1,n2)==1                     r = n2*cos(t(i)*pi/180) + n1*sin(t(i)*pi/180);                     [~,j] = min(abs(r-ones(1,nr)*r));                     h(j,i) = h(j,i) + 1;                 end             end         end         end end

where dr , dtheta distance , angle resolution. printing difference between hough table , matlab's there many zeros, there non-zero elements. idea why happening?

well, silly mistake...

r = n2*cos(t(i)*pi/180) + n1*sin(t(i)*pi/180);

must be

r = (n2-1)*cos(t(i)*pi/180) + (n1-1)*sin(t(i)*pi/180);

thanks weird matlab indexing.


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