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Artifacts in digital imagesThree kinds of artifacts unique to digital images are illustrated, namely aliasing caused by undersampling, interference phenomena caused by improper display of images, and harmonic overtones caused by quantization of amplitudes. Special attention is given to undersampling when the sample size and interval are the same. It is noted that this situation is important because it is typical of solid-state cameras. Quantization of image data of necessity introduces energy at harmonic overtones of the image spectrum. This energy is aliased if the frequency of the overtones is greater than 0.5 cycle/pixel. It cannot be selectively removed from the image through filtering, and the best way to suppress it is to maximize the amplification of the sensor before digital encoding.
Document ID
19810041578
Acquisition Source
Legacy CDMS
Document Type
Conference Proceedings
Authors
Lorre, J. J.
(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Gillespie, A. R.
(California Institute of Technology, Jet Propulsion Laboratory, Image Processing Laboratory, Pasadena Calif., United States)
Date Acquired
August 11, 2013
Publication Date
January 1, 1980
Subject Category
Instrumentation And Photography
Meeting Information
Meeting: Conference on Applications of Digital Image Processing to Astronomy
Location: Pasadena, CA
Start Date: August 20, 1980
End Date: August 22, 1980
Accession Number
81A25982
Funding Number(s)
CONTRACT_GRANT: NAS7-100
Distribution Limits
Public
Copyright
Other

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