Hi Gaurav, If it's just for annotating rectangular spatial fragments of images, then the W3C Media Fragments spec may come in handy: http://www.w3.org/TR/media-frags/.
Best, Tom -- Dr. Thomas Steiner, Employee, Google Inc. http://blog.tomayac.com, http://twitter.com/tomayac -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.12 (GNU/Linux) iFy0uwAntT0bE3xtRa5AfeCheCkthAtTh3reSabiGbl0ck0fjumBl3DCharaCTersAttH3b0ttom.hTtP5://xKcd.c0m/1181/ -----END PGP SIGNATURE-----
