Information about Whitening
Whitening may refer to:
- hypopigmentation.
- pallor.
- transforming a signal source to make it appear closer to white noise. See decorrelation, randomness extractor, hardware random number generator.
- the process of making something whiter.
MeSH D017496 Hypopigmentation is the loss of skin color. It is caused by melanocyte depletion — a decrease in the amino acid tyrosine, which is used by melanocytes to make melanin.
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Pallor
Classifications and external resources
ICD-10 R 23.1
ICD-9 782.61
Pallor is a reduced amount of oxyhemoglobin in skin or mucous membrane, a pale color which can be caused by illness, emotional shock or stress, avoiding excessive exposure
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Classifications and external resources
ICD-10 R 23.1
ICD-9 782.61
Pallor is a reduced amount of oxyhemoglobin in skin or mucous membrane, a pale color which can be caused by illness, emotional shock or stress, avoiding excessive exposure
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White noise is a random signal (or process) with a flat power spectral density. In other words, the signal's power spectral density has equal power in any band, at any centre frequency, having a given bandwidth.
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Decorrelation is a general term for any process that is used to reduce autocorrelation within a signal, or cross-correlation within a set of signals, while preserving other aspects of the signal.
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A randomness extractor is a function which, when applied to a high-entropy source (such as radioactive decay, or thermal noise), generates a random output that is shorter, yet uniformly distributed. In other words, outputting a completely random sample from a semi-random input.
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In computing, a hardware random number generator is an apparatus that generates random numbers from a physical process. Such devices are often based on microscopic phenomena such as thermal noise or the photoelectric effect or other quantum phenomena.
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