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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, or with an aperture mask, or both.
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.