Where/how to learn about digital image processing

[garagecoder]

I wonder if this old topic has a couple ideas about books then:

Best image processing textbooks

When I got my CS degree I made a big mistake and didn’t take the “Image Processing” class. I don’t mean 3D graphics. I’m mean 2d bit graphics. Discreet math and all. What are the best texts? I’m too old to audit a real class.