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Comment by H8crilA

5 years ago

Not the OP, but since repeatability is not a problem you can just use any cheap and insecure random number generator and hardcode a constant for the seed.

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H8crilA

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willis936  5 years ago

The period needs to be sufficiently long such that it won’t show up as visible artifacts. I would think something like PRBS23 would do the trick and be trivial to implement.

That’s the cheapest choice. Better whiteness could come with some added complexity.

  • darusnna  5 years ago

    For less visual artifacts it is recommended to use PRBS with 50% of the taps 0, 50% of the primitive polynomial tap 1. Same period (2^n-1), but less short-term correlations.

    • linuxlizard  5 years ago

      The great thing ("great") was we did the lower end laser printer niche for HP. We were able to make ASICs cheaper than HP could make them for themselves. So we had the (cough) less impressive hardware (scan sensors, laser engines, motors) to work with. So image quality was so-so at even the best of times.

      We were able to bury a lot of bodies under the sensor noise and engine output. But we made a super reliable, super cheap laser printer -- VW Bug of Laser Printers, if I may brag a bit. Twelve years later, the M1005 is still selling like hotcakes I hear.