Perceptual Hash Function for Images Based on Hierarchical Ordinal Pattern

Abstract

Distinguishing between the original and manipulated image is now a major issue as digital media can be easily manipulated, due to the advancement of the image processing techniques. A scheme is required to check the integrity of the digital multimedia. Another issue is efficient indexing and retrieval for multimedia data. Traditional indexing methods are time consuming and inefficient. Huge amount of data are generated by the users due to the growth of the Internet, which leads to storing and transmission of large volume of digital data. A perceptual hashing function is an effective solution to provide protection, integrity and authentication. Perceptual hashing function needs to be robust against geometric attacks and distinguish between perceptually different data. A robust perceptual image hash function is being proposed based on ordinal pattern, which were generated hierarchically.