spatial equalization

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• Histogram equalization — is a method in image processing of contrast adjustment using the image s histogram.OverviewThis method usually increases the local contrast of many images, especially when the usable data of the image is represented by close contrast values.… …   Wikipedia

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• White noise — is a random signal (or process) with a flat power spectral density. In other words, the signal contains equal power within a fixed bandwidth at any center frequency. White noise draws its name from white light in which the power spectral density… …   Wikipedia

• Hearing aid — Behind the ear aid In the ear aid …   Wikipedia