Very Computer

1. Gray Scale Quantization (Tapered Quantization ??)

Dear All,

  I am working on medical image processing. The images I am working on
  are digitized to gray levels ranging from 0 to 255. The analysis programs
  I am working on can handle gray levels ranging from 0 to 31

  What I am looking for is a method similar to one mentioned by
  R.C. Gonzalez et al in their book Digital Image Processing Pg 40
  (Addison Wesley 1992)

  "An alternative technique that is particularly attractive for
   distributing gray levels consistes of computing the frequency of
   occurrence of all allowed levels. If gray levels in a certain range
   occur frequently, while others occur rarely the quantization levels
   are finely spaced in this range and coarsely spaced outside of it.
   This method is sometimes called tapered quantization"

   Can anyone suggest any other reference where I can get a more detailed
   discussion of the above mentioned technique.

   Thanking you all in advance.

With Regards,

p.s.

The classic paper "Textural Features for Image Classification"
By Robert M. Haralick (IEEE Trans. Sy. Man & Cyber. 1973) discusses a
technique (in the Appendix III) refered as Equal-Probability
Quantizing. I read it and has some what grasped the technique but
still I want an alternative reference which will give a more elaborate
discussion on the technique.

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