Coherent superposition based single-channel color image encryption using gamma distribution and biometric phase keys

Abstract

A new coherent superposition based single-channel color image encryption using gamma distribution and biometric phase keys, is proposed. In this method, first the original color image is split into R, G, and B channels and corresponding iris print image is also split into R, G, and B channels. Second, each channel of iris print image is phase encoded to use as biometric phase key. Third, the biometric phase key of each channel is independently multiplied with gamma distribution phase mask. Finally the original color channel can be directly separated into two phase masks: one is a combination of gamma distribution and biometric phase keys and the other is a modulation of the combination by the original color channel. The remarkable benefit of the proposed scheme is introduction of gamma distribution and biometric phase keys. The proposed system can be implemented by using a simple hybrid optoelectronic system. Numerical simulation results validate the feasibility and effectiveness of the proposed method.