How to generate images of binary random speckle patterns

I want to generate a 1280*1024 pixels image, the size of random speckle patterns in the image is 5 pixels. (Similar to the result of the picture below)

https://www.researchgate.net/publication/271489495_Analysis_of_speckle_patterns_for_deformation_measurements_by_DIC

Answer 1

[Jan]

This topic is discussed frequently here:

https://www.mathworks.com/matlabcentral/answers/?term=tag%3A%22circle+packing%22