If there is optical character recognition software, it can do deep analysis of scanned documents, too.

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The changing colours are transmitted through the optical fibres to a camera, and thence fed into a neural net for analysis.

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The 31-year-old was later cleared by the ICC after a University of Western Australia biomechanical analysis, which concluded that the bent-arm action created an "optical illusion" of throwing.

BBC: Muttiah Muralitharan