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A Signal-Dependent Error Arising in Digitally Processed Images Due to Quantization

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2 Author(s)
Carter, W.H. ; Naval Research Laboratory ; Brown, V.D.

A troublesome error has been found in digital data which represents an image renormalized by a computer. The error, which takes the form of anomalous patterns in the switching sequence of certain bits, contributes unnecessary, signal-dependent noise to the-data. Experimental results illustrating this phenomenon are shown and a theoretical model is derived. The model shows that the phenomenon results from a qtiantization or roundoff error inherent in digital renormalization and describes its detailed behavior. A method for rescaling the data which does not lead to the introduction of noise is described.

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Computers, IEEE Transactions on  (Volume:C-21 ,  Issue: 12 )