Online Help for Chasys Draw IES: Image Stacking

Image Stacking

What is Image Stacking?

Image-stacking (referred to in some texts as the shift-and-add method) is a form of speckle imaging commonly used for obtaining high quality images from a number of short exposures with varying image shifts. It has been used in astronomy for several decades, and is the basis for the image-stabilization feature on some cameras. It involves the calculation of "motion vectors", which describe how a given scene has moved from one image to another. The images are then shifted back to a common center and added together. This provides an image with higher resolution (higher signal-to-noise at high spatial frequencies) than a conventional long exposure image.


What is it used for?

Image stacking can be used to improve an image in several ways, e.g. reducing noise, increasing resolution or removing unwanted objects. In addition to the built-in stacking features, Chasys Draw IES is bundled with a powerful image stacking plug-in called MegaStack™.



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