Adding points in imagesc matrix

Good day,

I have a 2D matrix and I am using imagesc to produce the following diagram:

I need to add extra values to the individual pixels like below:

so that I produce something like below:

I have tried googling on pixel addition but i have reached a dead end... ho can I proceede?

Answer 1

[Image Analyst]

Use imerode() to enlarge those black regions by 7 pixels around each black pixel.

kernel = true(3, 3);
kernel(1, 2) = false; % Don't use upper middle one so lower middle pixel doesn't go to black.
output = imerode(binaryImage, kernel);

[Allan Miller]

This is the result I am getting by using the code you suggested..., did I miss something?

[Image Analyst]

Attach your image and code in a .mat file. Until then, try

imshow(yourMatrix, []);
colormap(gray(256));