Affine transform resilient image fingerprinting

Affine transformations are a well-known robustness issue in many multimedia fingerprinting systems. Since it is quite easy with modem computers to apply affine transformations to audio, image and video content, there is an obvious necessity for affine transformation resilient fingerprinting. We present a new method for affine transformation resilient fingerprints that is based upon the autocorrelation of the Radon transform, the log mapping and the Fourier transform. Besides robustness, we also address issues such as security, database search efficiency and independence with perceptually different inputs. Experimental results show that the proposed fingerprints are highly robust to affine transformations.