count each row white pixels from the bottom to the top

i'm doing car plate localization project. now i wanna count each row white pixels from the bottom to the top. below is my code. thanks for advice.

[code] clc;clear all; % resize 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); imtool(BW1);

for i=1:x sumAlongRow = sum (sum (BW1==1));% Gives horizontal "profile." end [/code]

[Oleg Komarov]

To format the code, select it and click the {} button, thanks.

[ong]

[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 sumAlongRow = sum (sum (BW1==1));

end

[/code]

Answer 1

[Oleg Komarov]

The loop is unnecessary.

% First element of counts is the last row count:

counts(size(BW,1):-1:1,:) = sum(BW == 1,2);

or you can simply use:

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

[ong]

you mean apply like this

for i=1:x

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

disp('total white color for each row:');disp(i);disp(counts);

end

sorry, i'm fresh learner so i may ask more question

[Oleg Komarov]

You don't need any loop. Just execute it on BW.

Also, look at the documentation on sum(...,2);

Answer 2

[Image Analyst]

BW1 is already binary. You don't need to do BW1==1. Just use BW1 directly.