Image processing in ruby

Ruby
1

Hello

I was wondering if I could do image processing in Ruby or would have
to resort to something else for that.

Looking at available bindings I find

  • ImageScience - thumbnailer only, useless
  • RMagick - no useful functions
  • Ruby-Processing - only drawing and very basic math
  • ruby-dcl
  • Camellia - a few basic functions
2

I was wondering if I could do image processing in Ruby or would have
to resort to something else for that.

Looking at available bindings I find

  • ImageScience - thumbnailer only, useless
  • RMagick - no useful functions
  • Ruby-Processing - only drawing and very basic math
  • ruby-dcl
  • Camellia - a few basic functions

RMagick has no useful functions? I beg to differ. What kind of image
processing do you need? RMagick has always done the job for me.

-Jonathan N.

3

RMagick has no useful functions? I beg to differ. What kind of image
processing do you need? RMagick has always done the job for me.

OK, after looking at Camellia, I think I see what you want… you want
to be able to ‘detect’ things in images? I guess I had my definitions
for image processing mixed up if that’s the case… I’ve never had to
do that so I don’t have any useful advice, sorry…

-Jonathan N.

4

Sorry, ignore the previous message.

Looking at available bindings I find

  • ImageScience - thumbnailer only, useless

  • RMagick - no useful functions

  • DevIL - besides supporting some odd image formats just another
    ImageMagick

  • Ruby-Processing - only drawing, 3D and very basic math (and IDE/GUI
    which might be useful) (documentation mentions JRuby)

  • ruby-dcl - documented mostly in Japanese, the English documentation
    suggests only drawing, UI, and basic math although the docs claim use
    in oceanography and atmosphere research

  • VTK-Ruby - only drawing, 3D, UI, and some basic math

  • HornetsEye - seems to have a few basic functions but does not come
    with pre-built docs and I cannot build it

  • Camellia - a few basic functions

  • Ruby/OpenCV - a companion to Camelia (uses same data format) -
    quite a few useful funcions
    - edge detection (multiple methods)
    - FFT
    - other dissection methods that might be useful

  • ITK - companion to VTK, is supposed to be geared towards image
    processing but only Java bindings are available

  • includes edge detection, FFT, MI

  • perhaps could be imported into JRuby - found nice articles on that
    VTK/Using JRuby - KitwarePublic
    Metaprogramming with Ruby: Mapping Java Packages Onto Ruby Modules | Depth-First

Overall ITK seems about on par or perhaps more complete than OpenCV
which are the best tools I could find.

ITK seems best suited so far because it is fairly complete according
to the docs and ability to use JRuby means I could add stuff that runs
at decent speeds in the Sun JVM without resorting to something like C.

If somebody can suggest a better library I have overlooked I would like
to know.

Thanks

Michal

http://seattlerb.rubyforge.org/ImageScience.html
http://rmagick.rubyforge.org/

http://ruby.gfd-dennou.org/products/ruby-dcl/
http://www.gfd-dennou.org/arch/ruby/products/ruby-vtk/
http://camellia.sourceforge.net/index.html
http://rubyforge.org/projects/opencv/
http://www.itk.org/