Hi all, can anyone help me generate a checkerboard where i can control each square color-wise in gray scale?

For example i should be able to control the first square from 0 to 255 in gray scale while keeping other squares all black. Then do the same for the second square and the third and so on...

I can generate the matrix to do just that but then the scaling becomes an issue. I need my checkerboard to almost fit in the screen. For practical reasons, i would really appreciate if it was easy to manipulate the size of each pixel and the total number of squares in my pattern.

Any help is appreciated.

Answer 1

[Image Analyst]

To control every single square, you can't use checkerboard(). You must create an array with the desired values, then use repelem() to replicate it. Not hard - I'm sure you can do it because you're a smart engineer so give it a try.

[ceren duygu]

Thank you! I wasn't aware of the repelem command. I think i figured it out!

Also thanks for the pep talk! :)

Answer 2

[Mark Sherstan]

Use the checkboard function save it as an image and then adjust the greyscale as desired. Here is a basic example to get you going:

k = (checkerboard(10) > 0.5);
I = uint8(255 * k);
imshow(I)

[Mark Sherstan]

Image Analyst is correct, I overthought this one. Refer to his solution!

[ceren duygu]

Thank you though!

Answer 3

[Walter Roberson]

basic_cell = kron(eye(2), ones(pixel_height, pixel_width));
full_board = repmat(basic_cell, number_of_squares/2, number_of_squares/2);

For example,

basic_cell = kron(eye(2), ones(8,8));
full_board = rempat(basic_cell, 4, 4);

That would give you 8 squares on a side, each of which was 8 pixels by 8 pixels. The pixels would be alternating 1's and 0's.

For your purpose perhaps you would find it easier to use

full_board_cell = repmat( {0 * ones(pixel_height, pixel_width, 'uint8')}, number_of_squares, number_of_squares );
full_board = cell2mat(full_board_cell);
h = image(full_board);
colormap(gray(255));
for K = uint8(1) : uint8(255)
    drawnow();
    full_board_cell{1} = K * ones(pixel_height, pixel_width, 'uint8');
    full_board = cell2mat(full_board_cell);
    set(h, 'CData', full_board);
end

[ceren duygu]

Thanks for your time!