A framework for soft hashing and its application to robust image hashing

An increasing interest in the soft, hashing problem has been witnessed in recent, times. Techniques implementing soft hashing intend to mirror the behaviour of cryptographic hashing when the information to be hashed can be subject to different kinds of distortions. Many heuristic techniques for undertaking soft hashing of images and other multimedia. data. have been devised. Except for some attempts, a framework giving solid guidelines to solve the problem is largely lacking. In this paper we provide one possible approach to undertake the modelling of robust soft hashing, detailing the basic problems involved. We show how some prior schemes partly fit inside our model.