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- W184310720 abstract "Continuing experiments restoring images obtained by telescope looking a near horizontal direction close to the ground are discussed. The input data are from a time-sequence of short exposure image frames of a scene that are registered to a prototype to determine the warping as a function of the image coordinates. The prototype is initially an average of the whole sequence, being a motion-blurred but geometrically correct result. Each frame is then dewarped according to its derived warping function to remove apparent internal motion, and the new sequence is averaged to produce a new prototype having reduced motion blur. Registration is carried out by cross correlation within a hierarchy of reducing windows or apertures the prototype and the image frame to be registered. The effect is to zoom in on the relative motion at every pixel position within the image, obtaining x-shift and y-shift maps. The shift maps are used to dewarp the corresponding image frame. The resulting time-sequence of x-shift and y-shift maps also provides useful visualisations of the local directional tip and tilt behavior of the causal turbulence. This paper discusses development of the algorithms MATLAB, and commissioning of new telescopes and imaging equipment." @default.
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- W184310720 date "2002-01-01" @default.
- W184310720 modified "2023-09-27" @default.
- W184310720 title "Image Restoration of Images Obtained by Near-Horizontal Imaging through the Atmosphere" @default.
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