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Abstract: Computer representations of real numbers are necessarily discrete, with somefinite resolution, discreteness, quantization, or minimum representabledifference. We perform astrometric and photometric measurements on stars andco-add multiple observations of faint sources to demonstrate that essentiallyall of the scientific information in an optical astronomical image can bepreserved or transmitted when the minimum representable difference is a factorof two finer than the root-variance of the per-pixel noise. Adopting arepresentation this coarse reduces bandwidth for data acquisition,transmission, or storage, or permits better use of the system dynamic range,without sacrificing any information for down-stream data analysis, includinginformation on sources fainter than the minimum representable differenceitself.



Author: Adrian M. Price-Whelan NYU, David W. Hogg NYU

Source: https://arxiv.org/



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