How to implement Stroke Width Transform Algorithm

I am doing a project on Text Detection in Natural Scene Images. Does any one give me suggestions or any ideas for implementing Stroke Width Transform Algorithm. I aware of some steps 1.canny edge detection 2.gradient for canny image 3.stroke width detection 4.connected component grouping. I got struck while implementing 3rd step. Can any one give me clear steps with MATLAB code.

Thank You

[Kodaganur]

I aware of some steps

    canny edge detection
    gradient for canny image
    stroke width detection
    connected component grouping.

I got struck while implementing 3rd step. Please any one give me clear steps with MATLAB code for 3rd step.

clc;

clear all;

close all;

I=imread('12.jpg');

I1=rgb2gray(I);

ed=edge(I1,'canny',0.4);

[gx gy]=gradient(double(ed),0.5);

figure;

imshow(I);

gm=sqrt(gx.^2+gy.^2);

gdp=atan2(gy,gx);

figure;

imshow(gm);

[r c]=size(gdp);

%if pixel p lies on the stroke boundary,then gdp(gradient direction) must% %be perpendicular to the orientation of the stroke% for i=1:r

for j=1:c

    if gdp(i,j)==ed(i,j) 

       ray(i,j)=gm(i,j)+1*gdp(i,j);

    end 

end

end

In above code after finding gradient magnitude and direction, after that i need to consider gradient direction gdp of edge pixel p.then i need to follow the ray, ray=p+n.gdp, for n>0 until another edge pixel q is found. Please help me how to implement these steps.

[Kodaganur]

Please find the below link for images.

https://www.filesanywhere.com/fs/v.aspx?v=8a726689596171aa71a1

[Abdullah]

this link does not work.... can you update it please

[Celine Preeti]

Has anybody found a solution to this problem. I m completely new to image processing and would like to know how to perform stroke width transform

[Claire Reinhardt]

Please see http://uk.mathworks.com/help/vision/examples/automatically-detect-and-recognize-text-in-natural-images.html