stacking
 n.— «The first two images in the sequence show gradual enhancements in the surface detail of Phobos, made possible through a combination technique known as “stacking.” This procedure uses a mathematical process known as “Laplacian sharpening” to reinforce features that appear consistently in repetitive images and minimize features that show up only intermittently.» —“Spirit Rover Captures Animation of Martian Moons” by Leonard David Space.com Sept. 10, 2005. (source: Double-Tongued Dictionary)

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