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Institut für Astronomie und Astrophysik

Abteilung Astronomie

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Table of Contents



Introduction

This directory includes a few procedures for image processing or or analysis. The procedures MAX_ENTROPY and MAX_LIKELIHOOD were written by Frank Varosi to provide simple deconvolution methods. Additional procedures are available in pub/contrib/varosi/vlibm/deconv for monitoring the deconvolution iterations. Also see the LaTeX file in pub/contrib/varosi/deconv.tex

Index of Subroutines

BOXAVE Box-average a 1 or 2 dimensional array.
CONVOLVE Convolution of an image with a Point Spread Function (PSF)
CORREL_IMAGES Compute the 2-D cross-correlation function of two images
CORREL_OPTIMIZE Find the optimal (x,y) pixel offset of image_B relative to image_A
CORRMAT_ANALYZE Find the optimal (x,y) offset to maximize correlation of 2 images
CR_REJECT General, iterative cosmic ray rejection using two or more input images.
DIST_CIRCLE Form a square array where each value is its distance to a given center.
DIST_ELLIPSE Create a mask array useful for elliptical aperture photemetry
FILTER_IMAGE Identical to MEDIAN or SMOOTH but handle edges and allow iterations.
FREBIN Shrink or expand the size of an array an arbitary amount using interpolation
IMLIST Display pixel values on an image surrounding a specified X,Y center.
MAX_ENTROPY Deconvolution of data by Maximum Entropy analysis, given the PSF
MAX_LIKELIHOOD Maximum likelihood deconvolution of an image or a spectrum.
MEDARR Compute the median at each pixel across a set of 2-d images
POSITIVITY Map an image uniquely and smoothly into all positive values.
PSF_GAUSSIAN Create a 1-d, 2-d, or 3-d Gaussian with specified FWHM, center
RINTER Cubic interpolation of an image at a set of reference points.
SIGMA_FILTER Replace pixels more than a specified pixels deviant from its neighbors
EXTRAP This procedure fills in the ends of a one-dimensional array from interior portions using polynomial extrapolation.
XMEDSKY Subtract sky from an image as a 1-D function of X
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Jörn Wilms (wilms@astro.uni-tuebingen.de)
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