If this sounds familiar to you, it’s because this method works very similarly to error-diffusion. Instead of letting adjacent pixels compensate for the error, we’re letting each successive candidate compensate for the combined error of all previous candidates.
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The telescope, a partnership of NASA and the European and Canadian space agencies, homed in on PMR 1, a planetary nebula nicknamed the Exposed Cranium for being the spitting image of a brain scan. The nebula lies about 5,000 light-years away from Earth in the Vela constellation.