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Speckle masking (aka bispectrum analysis or speckle interferometry) is a type of image construction and processing that serves as a speckle suppression technique, a technique of achieving high angular resolution and working around distortions from seeing issues. The technique can be used with optical telescopes, utilizing multiple images of the same object, and/or with an aperture mask (changing the size and/or shape of the aperture).
A version is used in radio interferometry such as very-long-baseline interferometry. To carry it out, the bispectrum of the signal is calculated and averaged and used as an approximation of the closure phase, which is a combination of the signals from which a more detailed image can be formed.