Incorrect. The magnetic detectors haven't been manufactured or sold since the early 80s.
The simplest machines do use 2 narrow optical detectors, but as their algorithms are considered good enough that you have to basically destroy a bill to use them, what's the point.
The simplest machines do use 2 narrow optical detectors, but as their algorithms are considered good enough that you have to basically destroy a bill to use them, what's the point.
See my other post about SVM/PCA in this thread.