Re: [OctDev] Greylevel morphological operations + other ideas

[Etienne G. <et...@cs...>]

  Hi Stefan,

On Fri, Jan 14, 2005 at 01:48:50AM +0200, Stefan van der Walt wrote:
# Hi Etienne
# 
# Adding grey-level morphology is a good idea.  Does MATLAB have any
# similar functions?  What sort of interface do they use?
   ^^^
  Not last time I checked. We're free not to imitate braindead
behavior, and invent our own, like

   gl_erode(im,radii)
   gl_dilate(im,radii)
   gl_morph(im,radius1,operation1,...,radiusS,operationS) 


# We should really also be looking at re-implementing octave-forge's
# image handling.  Now that octave supports uint16 etc., we do not need
# to guess image depths anymore.  Colour images should be stored as
# MxNx3 matrices of the correct value type (not as three different images).

  Since you mentionned the other product, is that how Matlab does it?
 
# Unless someone else feels highly motivated, I will start on this
# sometime closer to February (maybe by first adding some rudimentary
# unit tests to all imaging functions, to track what breaks with the
# changes).
# 
# Another feature I would like to add is the handling of videos.  I was
# thinking of using libavifile -- does anyone here have any experience
# with it?

  Not me :-(.

  Cheers,

  Etienne
 
# Finally, the image histogram equalisation function is still not
# working correctly.  But fixing it will be a lot easier once the image
# types are implemented.
# 
# Regards
# Stefan
# 
# On Thu, Jan 06, 2005 at 01:48:36PM -0500, Etienne Grossmann wrote:
# > 
# > 
# >   Hi All,
# > 
# > I consider adding some greylevel image morphology functionality to
# > octave-forge. I have this function:
# > 
# > 
# > ## im2 = g_all (im,scales)       - Greylevel morphological opertations
# > ##
# > ##      Open, close, erode and dilate greylevel image im at various scales.
# > ##      Dilation at scale s is the greatest greylevel within radius s.
# > ##      Erosion  at scale s is the least greylevel within radius s.
# > ##      Opening  is erosion followed by dilation (all at the same scale).
# > ##      Closing  is dilation followed by erosion (all at the same scale).
# > ## 
# > ## im     : R x C       : Image
# > ## scales : 1 x S       : Scales at which morphological operations are performed
# > ##
# > ## im2     : R x C x 4*S : Opened (4*i+1), closed (4*i+2), eroded (4*i+3) and
# > ##                        dilated (4*i+4) images (i in 0:S-1)
# > ##
# > ## See also: g_open_close.
# > ## Todo    : Make this function more efficient.
# > 
# >   Any suggestions on other possible interfaces? I can also put
# > fucs for individual operation.
# > 
# >    Cheers,
# > 
# >   Etienne
[snip]

-- 
Etienne Grossmann ------ http://www.cs.uky.edu/~etienne