count white pixel from the bottom to the top and from the left to the right

i'm fresh learner for matlab, now i doing car plate localization project. My supervisor have give this hits to me "A(i,j)=abs(I(i,j)-I(i,j+1))" for count white pixel from the bottom to the top and from the left to the right, however i have no idea about this statement. below is my code i done.

[code]

clc;clear all;

input = imread('1.jpg')

I = imresize (input, [288 768]);

J = rgb2gray(I);

L = medfilt2 (J, [5 5]);

BW1 = edge(L,'sobel');

[x y]=size(BW1);

for i=1:x

counts = flipud(sum(BW1 == 1,2));

end

[/code]

thanks for your advice.

[Oleg Komarov]

To format properly your code: http://www.mathworks.com/matlabcentral/answers/7885-tutorial-how-to-format-your-question

[Oleg Komarov]

Ans as I said in the previous your post, you don't need the loop.

Answer 1

[Image Analyst]

A(i,j)=abs(I(i,j)-I(i,j+1)) has nothing at all to do with the code you posted. To do that, you'd use conv2(), not medfilt2, edge, etc.