Displacement in pixels

[darksoft]

Good night, I would like to know if someone knows how to be more responsive in the displacements of x and y, since I have a higher resolution camera but the values ​​of these axes remain the same and I do not obtain greater precision. I would like to capture displacements at the pixel level, but I do not know how to do it.

I'm waiting for any useful information.

Of course, thank you very much to everyone.