Noise-free recovery of color information using a joint-extended gyrator transform correlator

A novel method for color-information security system based on joint-extended gyrator transform correlator is introduced. In this method, the color image is split into three-color channels: red, green, blue. Each color channel bonded to a random phase mask and a random phase key code are gyrator transformed separately. The two obtained information multiplexed to form a joint gyrator power spectrum, which is again gyrator transformed to get a joint-extended gyrator power spectrum. The same phase key code is used in both the data encryption and decryption. The three-color channels are independently encrypted and decrypted to avoid the interference of crosstalks. The decrypted image is obtained without any noise and distortion. The angle parameters of gyrator transform in each channel are additional encryption keys for enhancing the security. The proposed system has resistant against chosen- and known plaintext attacks. The calculated values of mean square error and peak signal-to-noise ratio support the noise-free recovery of original color image. The implementation of opto-electronic setup has been proposed. The validity and feasibility of the proposed method are demonstrated by numerical simulations.

► An image encryption using joint-extended gyrator transform correlator is proposed. ► JEGTC is used as a new device to produce noise-free retrieved information. ► The angle parameters of gyrator transform in each channel are additional keys. ► The opto-electronic setup of encryption technique has been presented. ► Numerical simulations demonstrate the feasibility of the proposed method.