In The Olden Pre-Digital Days porn was either in print or on a television screen. Back then (we are talking two whole decades ago) experienced broadcast enginee

In The Olden Pre-Digital Days porn was either in print or on a television screen. Back then (we are talking two whole decades ago) experienced broadcast engineers could instantly spot porn just by catching a look at an oscilloscope (of which there were usually many in a machine room). Notionally the oscilloscope would be there to show that the luminance and chroma was okay in the signal (i.e. it could be broadcast over the airwaves to look as intended at the other end - PAL/NTSC), however, porn and anything likely to be porn had a distinctive pattern on the oscilloscope screen. Should porn be suspected then the source material would obviously be patched through to a monitor 'just in case'. Note that the oscilloscope was analog and that the image would be changing 25/30 times a second. Also, back then there were not so many false positives on broadcast TV, e.g. pop videos etc. where today's audience deems them artful rather than porn. If I had to solve the problem programatically I would find a retired broadcast engineer and start from there, with what can be learned from a 'scope.