Angle between Pixels of an image

zaheer ahmad — Sat, 03 May 2008 16:07:03 -0400

I am working on Cursive ( Urdu/Arabic )Optical character
Recognition (OCR )System. i need to find out the flow of
pixels or angle between pixels (i.e. angle between pixel1
and pixel5)
is it possible using any existing filters in matlab. if yes
which filter and where to find help regarding the filter.
the image is of binary type.
Presently i am scanning the image for black pixels, storing
the pixels location then using ' atan2 ' find the angle.
the complete code is as below:

clear
clc
Img=im2bw(imread('SingleWord.bmp'));
imshow(Img);hold on; axis manual;
[Ymax, Xmax] = size(Img);

points=[22,22];
xx=0;yy=0;
for y=Ymax:-1:1
for x=Xmax:-1:1

    if Img(y,x)==0
         plot(x,y,'Color','r','LineWidth', 0.5,'Marker','.');
         xx=xx+1;
         yy=yy+1;

         points(xx,yy)=x;
         points(xx+1,yy)=y;

         break;
    end
end
end

for i=1:25
    for j=1:25

PA=atan2((points(i,j+1)-points(i+1,j+1)),((points(i,j+1)-points(i,j))))
    end
end

It gives me a list of angles as expected but with errors.
the code is given here for explaining my aim and to make it
sure you follow me.
thanks in advance.

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Angle between Pixels of an image