Hi there!

I am trying to estimate the fractal dimension of nanoaggregates, e.g. soot particles, using Fraclac box counting. But before calculating the Db for the actual particles I would like to test the algorithm with some simple test images.

Playing around with test images, such as a circle contour, I get Db = 1.0, as expected. But when I calculate the Db for a filled circle or a square I get Db = [1.7…1.8] and not 2.0, as I would expect.

Db = 1.0

Db = 1.78

Db = 1.71

All images were first binarized and then analyzed as monofractals. Tried many different options, such as *minimum box size*, *number of positions for grids* – no change. When I visualize the grid (“*draw grids*”), it looks fine.

Did someone encounter this problem, any thoughts?

Thanks!