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Technology Stocks : Video Conversion

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To: goldworldnet who wrote (30)	3/27/2011 7:32:57 PM
From: goldworldnet	Read Replies (1) of 48

For this investigation the interpolation was carried out using the SWarp programme written by Emmanuel Bertin. This programme resamples and co-adds images using any WCS defined astrometric projection. For this work, it was only the resampling/interpolation part of the programme that was used. The interpolation methods tested out were: NEAREST Nearest neighbour interpolation simply uses the value from the nearest pixel. In terms of a convolution kernel this is a square top hat function, with width 1 pixel. BILINEAR A pyramidal response function with a FWHM of 1 pixel. This results in a bilinear interpolation. LANCZOS2 Lanczos-2 4-tap filter ie. sinc(px)sinc(px/2) for \|x\| < 2 LANCZOS3 Lanczos-3 6-tap filter ie. sinc(px)sinc(px/3) for \|x\| < 3 LANCZOS4 Lanczos-4 8-tap filter ie. sinc(px)sinc(px/4) for \|x\| < 4 The Lanczos methods belong to the general class of windowed sinc(x) interpolation methods. There are other common interpolation schemes that may be appropriate for certain applications that are not available in SWarp and that need considering eg. Hann/Hamming, hyperbolic tangent, bi-cubic spline. Bertin kindly provided a pre-release version (2.0b8) of the latest software. pictures at link: casu.ast.cam.ac.uk * * *

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