A technique for stacking digitized photographic plates.

Details A technique for stacking digitized photographic plates. A technique for stacking digitized photographic plates.

Feb 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993wfinw...3...52b&link_type=abstract

IAU Working Group on Wide-Field Imaging, Newsl., No. 3, p. 52 - 56

Computer Science

Photographic Plates: Methods Of Reduction, Photographic Techniques

Scientific paper

With the advent of fast scanning microphotometers and inexpensive digital mass storage, there has been a resurgence of interest in performing deep (B ≤ 25) panoramic surveys by co-adding large numbers (≡102) of digitized photographic plates. While the Kodak IIIa emulsion are highly linear recorders of photographic grain density, the authors demonstrate that the threshold and saturation levels which restrict the dynamic range of the emulsion can distort the higher statistical moments of the grain density fluctuations (variance, skewness, etc.) along the linear part of the characteristic curve. The variance of the grain fluctuations is only additive between digitized plates that preserve the Poissonian grain noise. In order to compensate for the statistical distortion, the authors derive the necessary pixel weighting for five scanning aperture sizes (2 μm, 4 μm, 8 μm, 16 μm, 32 μm) as a function of the grain density.

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