Moire pattern
Moire pattern image caused by a combination of two effects, sampling rate and reconstruction filter shape, they occur in image signals when two conditions are met. First, when the sampling frequency is close to the nyquist frequency for the signal (i.E., Two times the highest frequency in the image signal). Second, the cutoff frequency of the reconstruction filter is located beyond one half the sampling frequency (e.G., A first order filter). These two problems result in mirror images of frequency components around the sampling frequency causing banding in the image signal. The moire effect is seen in practical applications due to real world problems of finite filter lengths and errors in sampling rates.
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Author of the text: Ed. P.A. Laplante Boca Raton: CRC Press LLC, 2000
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