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Reference.org
Speckle imaging
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<p>Speckle imaging comprises a range of high-resolution <a href="/facts/Astrophotography/NeWNUJEn">astronomical imaging</a> techniques based on the analysis of large numbers of short <a href="/facts/Exposure_(photography)/Rzr0aGMd">exposures</a> that freeze the variation of <a href="/facts/Astronomical_seeing/TdVzedKJ">atmospheric turbulence</a>. They can be divided into the <a href="/facts/Shift-and-add/wr4y6aX8">shift-and-add</a> ("<i>image stacking</i>") method and the speckle interferometry methods. These techniques can dramatically increase the <a href="/facts/Optical_resolution/TcLkPYFw">resolution</a> of ground-based <a href="/facts/Telescope/BDwYahhR">telescopes</a>, but are limited to bright targets. </p>