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- Newsgroups: comp.soft-sys.khoros
- Path: sparky!uunet!zaphod.mps.ohio-state.edu!sol.ctr.columbia.edu!usc!elroy.jpl.nasa.gov!henry!mathew
- From: mathew@elroy.Jpl.Nasa.Gov (Mathew Yeates)
- Subject: New Version of RLAB available
- Message-ID: <mathew.722555453@henry>
- Sender: news@elroy.jpl.nasa.gov (Usenet)
- Nntp-Posting-Host: henry.jpl.nasa.gov
- Organization: Image Analysis Systems Group, JPL
- Date: Mon, 23 Nov 1992 21:50:53 GMT
- Lines: 113
-
-
- Version 0.2 of RLAB, a collection of a few routines I have written
- is now available. There are several restoration routines, two registration
- routines and one recognition routine. The focus of the restoration routines
- is primarily on the technique commonly refered to as regularization.
-
- In going from 0.1 to 0.2 I have corrected a few bugs,
- added two routines, and included
- workspaces that show that usage of each routine. I also have taken out
- a routine or two that I didnt feel was useful.
-
- Here is a listing of the
- routines and some references if you want to learn more. I hope to have
- a JPL external publication coming out soon which explains how each of
- the algorithms work but, until then, you'll have to check the references.
-
- Obtaining RLAB: RLAB can be obtained through anonymous ftp from the site
- elroy.jpl.nasa.gov in /pub/mathew/rlab-0.2.tar.Z. A copy has also been placed
- in the contrib directory at pprg.eece.unm.edu.
-
-
-
-
- RESTORATION
-
- vmanual - manually lets the user step through a series of values which
- determines the degree of regularization (smoothing). The misfit values
- can be saved for plotting with xprism2. The restored image, for each
- regularization value, can be saved and viewed with Animate.
-
- vchi - The regularization parameter is chosen so that the misfit satisfies
- a chi squared constraint.
-
- vbayes - the regularization parameter is selected that is most probable
- given the data.
-
- vpremodel - same as vbayes except the image prior is not assumed to be flat
- but, instead, is the result of convolving a flat prior "pre"- image
- with a blurring kernel. This is Stephen Gulls "Intrinsic Correlation" model.
-
-
- lucy - This is a Cantata workspace which implements the Lucy-Richardson
- restoration algorithm
-
-
- REGISTRATION
-
- vrotmatch - template matching on rotated images. A set of rotationally
- invariant coefficients is taken from the template image and compared
- at different locations on the target image. (This rotuine was called
- vmatch in 0.1)
-
- vtranmatch - fast template matching on nonrotated images. I use an
- iterative schemes that results in an algorithm with speed independent
- of window size and depending only linearly on the size of the search
- region.
-
- RECOGNITION
-
- vtexclass- texture classification using sum and difference histograms
- vcohist - computes sum and difference histograms for use in vtexclass.
-
-
- MISC
-
- cipe2viff - converts a raw file to a viff file by using an auxillary
- header file. The header file contains keyword value pairs specifying
- thje values you normally would give to raw2viff. In fact, except for
- the header reading code, this is just a trivial front end to raw2viff.
-
-
- vmoments - Calculates a set of rotationally invariant coefficients
- about a given pixel in a circular window of desired radius. Optionally,
- take samples from the window.
-
- vmann - generates the Mann-Whitney distribution for a given choice of
- size for each of two sample sets. Both this and vmoments are used in
- vmatch.
-
- vcfft2 - 2d non radix 2 fft's.
-
- vcorr - spatial correlation. mask is centered over pixel so there is no offset
- in the resulting image. Boundaries are handled by extending the image.
-
- vbandmin - in a multiband image, replace pixel value with bandnumber of
- smallest value.
-
- FOR FUN
-
- I have included a hack of the Khoros package Warpimage which I call morphtool.
- The idea is to create animation sequences like the kind you see in a lot
- of commercials these days where one face slowly changes into another.
- This is really a hack and included just for fun.
-
- REFERENCES -
-
- vchi,vbayes - check out Thompson et al , "A Study of Methods of choosing
- the smoothing parameter in image restoration by regularization"
- IEEE PAMI Vol 13, No 4, 1991.
-
- vpremodel - Gull, "Developments in Maximum Entropy and Data Analysis" in
- Maximum Entropy and Bayesian Methods, Cambridge England, 1988.
-
-
-
- vmatch,vmoments,vmann - Goshtasby, "Template Matching in Rotated Images"
- IEEE PAMI Vol 7, No 3 1985.
-
- lucy - Lucy, "An iterative technique for the rectification of observed
- distributions", The Astronomical Journal June 1974.
-
- vtexclass, vcohist - " Sum and Difference Histograms for Texture
- Classification", IEEE PAMI vol 7 No 1 1986.
-