How to use houghlines to detect the barcode lines

How can I detect the lines using houghline or other hough function in Matlab??

Answer 1

[Chandra Kurniawan]

Hi,

First, sorry for changing your tif image into jpg format.

Here, I have the code to perform line detection.

I = imread('15d27ap.jpg');
Igray = rgb2gray(I);          
Ibw = ~im2bw(Igray,graythresh(Igray));
Iskel = bwmorph(Ibw,'thin',inf);                     

%%%%radon tranform
[R xp] = radon(Iskel,0:1:360);                                       
[II JJ] = find(R >= (max(max(R)) * 0.75));      

imshow(Ibw); hold on;
for k = 1 : size(II,1)    
    R_i = (JJ(k) - 1) * 1;
    xp_i = xp(II(k));       
    x_origin = size(Iskel,2) / 2 + (xp_i) * cos(R_i * pi / 180);
    y_origin = size(Iskel,1) / 2 - (xp_i) * sin(R_i * pi / 180);       
    y1 = (y_origin - (1 - x_origin) * tan(((R_i) - 90) * pi / 180));
    ye = (y_origin - (size(Iskel,2) - x_origin) * tan(((R_i) - 90) * pi / 180));       
    line([1 size(Iskel,2)], [y1 ye],'color','g');     
end

The result :

I think my code just detect the lines.

In other word, we only know the starting and end point of each lines.

I hope this helps you.