A captcha doesn't have to involve text - it can be any automated test that sorts humans from software. Vicarious in Union City, California, has a system that can read distorted text, but the firm has greater ambitions for artificial intelligence. Next up will be coping with optical illusions. Dileep George, one of the firm's co-founders, thinks more training could help the algorithm with tasks such as recognising three-dimensional symbols in a two-dimensional image.
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