Xerox devices randomly altering numbers

  1. nsaspook

    nsaspook 1,203
    Science Advisor

  2. jcsd
  3. DavidSnider

    DavidSnider 507
    Gold Member

    Holy crap. I would have never imagined a xerox machine could make that sort of error. Their scanning algorithms must be pretty darn clever to even have that sort of bug.
     
  4. jtbell

    Staff: Mentor

    Those eunuch programmers have gotten too clever. :biggrin:
     
  5. nsaspook

    nsaspook 1,203
    Science Advisor

    They were very clever, to the point that saving document space became more important than document image integrity. Lossy compression should never be used when you expect the fidelity of the result to be a limited only by the resolution of the scanning process and the ability of the compression process to eliminate 'redundant' information. It's much better to see a blurry blob than a clear image that's completely wrong in any document scanning operation. Lossy compression usually goes beyond the 'redundant' and starts 'guessing' about different but similar patterns. In this case some numbers are deemed visually similar at some lossy compression ratio so it (the software classifier/comparator) selected a previously stored (seemly random) version to save space.
     
  6. robphy

    robphy 4,435
    Science Advisor
    Homework Helper
    Gold Member

  7. nsaspook

    nsaspook 1,203
    Science Advisor

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