Caliph & Emir are MPEG-7 based Java prototypes for digital photo and image annotation and retrieval supporting graph like annotation for semantic metadata and content based image retrieval using MPEG-7 descriptors.
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B. Henne, M. Koch, and M. Smith. 18th International Conference on Financial Cryptography and Data Security (FC 2014), volume 8437 of LNCS, Springer, (2014)