[R] Image analysis in R?

[Peter Holzer]

Hello Bjorn

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'.

Cheers, Peter


=?iso-8859-1?Q?Bj=F8rn-Helge=5FMevik?= writes:
 > 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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