[R] Image analysis in R?
holzer at stat.math.ethz.ch
Thu Sep 21 08:41:28 CEST 2000
I have written some functions for personal use. They allow to read and
write ppm, pgm and pbm images. But I haven't put them in a package, it's
just C and R code.
I think that generally you will need to use C or Fortran or something else
but not R for most manipulations of images (e.g. filtering), so you might
just want to write an R interface to existing code. My experience
is that using R code directly will make things prohibitively slow if images
get large. On the other hand I appreciate writing the code first in R, where
the results are easy to check, and then transform it to C.
For resizing, cropping etc. I recommend `xv'.
> As far as I can tell, there are no facilities in the "base" R for image
> analysis. Is there any extension or package for R that implements
> image analysis? I'm thinking of features such as
> o Reading and writing image files,
> o displaying indexed or "true color" images,
> o resizing, cropping, etc, of images,
> o filters for manipulating images (smoothing, edge detection, etc)
> o feature extraction
> Bjørn-Helge Mevik <bhm at math.uio.no>
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