Securing color image by using hyperchaotic system in gyrator transform domains

A color image encryption scheme is proposed by using a hyperchaotic system in gyrator transform domains. The red, green and blue (RGB) components of the original color image are encoded into one dimensional stream, respectively. Four chaotic sequences generated by a hyperchaotic system are blended into the streams to synthesize complex sequences. Subsequently the one dimensional complex streams are scrambled by employing discrete cosine transform and then encoded back to image format. Finally, the scrambled complex functions are encoded and transformed in gyrator domains. The parameters in the hyperchaotic system and the gyrator optical system are regarded as the extra keys for improving the security of the proposed scheme. Some numerical simulations are made to test the validity and capability of the proposed color encryption algorithm.

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