ZClass (Zernike Class) is a Python object that takes input from a Protein Databank (PDB) file and converts it to a voxelised image. The voxelised image can then expressed in terms of an expansion in a basis set of Zernike polynomials which can be used to make rapid comparisons between different protein shapes.
The UEA Computational Biology Laboratory at the University of East Anglia (UEA)
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J Comput Biol. 2009 Mar;16(3):487-500. doi: 10.1089/cmb.2008.0083.
The application of 3D Zernike moments for the description of “model-free” molecular structure, functional motion, and structural reliability.
Grandison S, Roberts C, Morris RJ.