[Octave-patch-tracker] [patch #8713] image package: new color conversion functions: rgb2lab etc.

[H. G.]

URL:
  <http://savannah.gnu.org/patch/?8713>

                 Summary: image package: new color conversion functions:
rgb2lab etc.
                 Project: GNU Octave
            Submitted by: hardy
            Submitted on: Mo 10 Aug 2015 18:18:46 GMT
                Category: None
                Priority: 5 - Normal
                  Status: None
                 Privacy: Public
             Assigned to: None
        Originator Email: 
             Open/Closed: Open
         Discussion Lock: Any

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Details:

Here is a patch with several new color conversion functions: 

rgb2xyz, xyz2rgb
xyz2lab, lab2xyz
rgb2lab, lab2rgb

Those functions are all new to Octave. I am the author and the algorithms are
taken from the (cited) book of Burger and Burge "Digitale Bildverarbeitung"
(2015). (There is an english version of the book as well.)

The functions are reasonably Matlab compatible. At some points in the code I
intentionally took a slightly less Matlab compatible approach, in order to
better fulfill the CIE standards with those functions. But for practical
purposes those functions are Matlab compatible.

All those functions use (a slightly adapted version of) the private funtions 

colorspace_conversion_input_check.m and colorspace_conversion_revert.m 

that Carne introduced recently to the color conversion functions in Octave
core. I have duplicated those two helper functions into the image package. You
have a more clever approach to this, just let me know.

I tried to follow the Octave coding styles, but I'm not sure I succeded with
it everywhere. Ther are also help texts, source references and a bunch of
tests included.

I would appreciate any feedback and would be happy to see those new functions
in the image package at some time :)

Hartmut




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File Attachments:


-------------------------------------------------------
Date: Mo 10 Aug 2015 18:18:46 GMT  Name:
new_colorconversion_functions_rgb2lab_etc.patch  Size: 37kB   By: hardy
patch with new color conversion functions
<http://savannah.gnu.org/patch/download.php?file_id=34620>

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