The MagickWand interface is a new high-level C API interface to ImageMagick core methods. We discourage the use of the core methods and encourage the use of this API instead. Post MagickWand questions, bug reports, and suggestions to this forum.
As of version 6.9.3-7 of ImageMagick, the MeanShiftImage function has not been implemented within MagickWand.
But even if it had, you would still have a problem because it would not have been implemented in FreePascal which appears to use a very old version of IM from 2005.
Pete
Sorry, my ISP shutdown all personal webspace so my MagickWand Examples in C is offline.
See my message in this topic for a link to a zip of all the files.