  We propose the general construction formula of shape-color primitives by
using partial differentials of each color channel in this paper. By using all
kinds of shape-color primitives, shape-color differential moment invariants can
be constructed very easily, which are invariant to the shape affine and color
affine transforms. 50 instances of SCDMIs are obtained finally. In experiments,
several commonly used color descriptors and SCDMIs are used in image
classification and retrieval of color images, respectively. By comparing the
experimental results, we find that SCDMIs get better results.
