How to count the number of pixels in each grid ?

I have burned the lines into the image and now I want I want to count the number of pixels in each grid. It is a binary image.

Answer 1

[Image Analyst]

Try this:

[rows, columns] = size(binaryImage);
x = round(linspace(1, columns+1, 11)); % Divide into 10 zones.
y = round(linspace(1, rows+1, 3)); % Divide into 2 zones.
for r = 1 : length(y) - 1
    for c = 1 : length(x) - 1
        row1 = y(r);
        row2 = y(r+1) - 1;
        col1 = x(c);
        col2 = x(c+1) - 1;
        pixelCount(r, c) = nnz(binaryImage(row1:row2, col1:col2))
    end
end

Or you could use blockproc(). Demos attached.

[Suyog Pathare]

Thank you, it did work!

[Suyog Pathare]

How can I show the division on the image?

[Image Analyst]

You can call xline() and yline():

grayImage = imread('CameraMan.tif');
imshow(grayImage, []);
binaryImage = imbinarize(grayImage);
imshow(binaryImage);
[rows, columns] = size(binaryImage);
x = round(linspace(1, columns+1, 11)); % Divide into 10 zones.
y = round(linspace(1, rows+1, 3)); % Divide into 2 zones.
for r = 1 : length(y) - 1
	row1 = y(r);
	row2 = y(r+1) - 1;
	yline(row1, 'Color', 'r');
	for c = 1 : length(x) - 1
		col1 = x(c);
		col2 = x(c+1) - 1;
		pixelCount(r, c) = nnz(binaryImage(row1:row2, col1:col2));
		xline(col1, 'Color', 'r');
	end
end

[Suyog Pathare]

Thank you!

Answer 2

[KALYAN ACHARJYA]

"I want I want to count the number of pixels in each grid"

As I answered your previous question, assuming you could use the grid number based on how to split the image.

Read the respective grid,then add the all ones in the grid

pixel_counts=sum(grid(:))

This way:

for i=1:..
data=image(graid_i_indices); % Just an Example
pixel_num(i)=sum(data(:));
end 

Hope it helps!