Changeset 3373
- Timestamp:
- Mar 3, 2005, 4:48:52 PM (21 years ago)
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trunk/doc/misc/imageSubtraction.tex (modified) (3 diffs)
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trunk/doc/misc/imageSubtraction.tex
r3368 r3373 1 %%% $Id: imageSubtraction.tex,v 1. 1 2005-03-03 00:38:39price Exp $1 %%% $Id: imageSubtraction.tex,v 1.2 2005-03-04 02:48:52 price Exp $ 2 2 \documentclass[panstarrs]{panstarrs} 3 3 … … 210 210 We are not using any spatial variation of the kernel. The quantities 211 211 are being measured within a 5 pixel radius aperture, centered on stars 212 detected in the image. We use clipping 213 (2 iterations at 3.5$\sigma$) to obtain statistics on the population 214 unaffected by small issues (such as very bright stars which haven't 215 been properly masked). 212 detected in the image. We use clipping (2 iterations at 3.5$\sigma$) 213 to obtain statistics on the population unaffected by small issues 214 (such as very bright stars which haven't been properly masked). 216 215 217 216 \begin{table}[h] … … 257 256 Our head-to-head comparison indicates that POIS performs a subtraction 258 257 of comparable quality to ISIS, but is faster by a factor of a few. We 259 are yet to compare the quality of subtractions where the density of260 high signal-to-noise stars is low; in this regime, ISIS might provide 261 a better subtraction than POIS, simply because the POIS kernel pixels 262 are not correlated.258 are yet to compare the quality of subtractions where there is a low 259 density of stars with good signal-to-noise; in this regime, ISIS might 260 provide a better subtraction than POIS, simply because the POIS kernel 261 pixels are not correlated. 263 262 264 263 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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