Color image security system using double random-structured phase encoding in gyrator transform domain

Abstract

A novel method for encoding color information based on a double random phase mask and a double structured phase mask in a gyrator transform domain is proposed. The amplitude transmittance of the Fresnel zone plate is used as structured phase-mask encoding. A color image is first segregated into red, green, and blue component images. Each of these component images are then independently encrypted using first a random phase mask placed at the image plane and transmitted through the first structured phase mask. They are then encoded by the first gyrator transform. The resulting information is again encrypted by a second random phase mask placed at the gyrator transform plane and transmitted through the second structured phase mask, and then encoded by the second gyrator transform. The system parameters of the structured phase mask and gyrator transform in each channel serve as additional encryption keys and enlarge the key space. The encryption process can be realized with an electro-optical hybrid system. The proposed system avoids problems arising from misalignment and benefits of a higher space-bandwidth product. Numerical simulations are presented to confirm the security, validity, and possibility of the proposed idea.

Simultaneous compression and encryption of color video images

“…The use of polarized light was also suggested as an efficient encryption method to increase the image quality and edge detection of objects embedded in various media [6,7]. Interestingly, other references have focused on encryption procedures to color images based on Arnold [8], and gyrator [9,10] transforms. However, two major problems impede their widespread use.…”

Generalized Arnold map-based optical multiple color-image encoding in gyrator transform domain

“…The GT can also be computer simulated by using phase-only filtering, Fourier transform and inverse Fourier transform [40]. The GT based color image encryption [11,12,19,20,41,44] and gray image encryption [42,43] have been researched. …”

Color image encryption by using Yang-Gu mixture amplitude-phase retrieval algorithm in gyrator transform domain and two-dimensional Sine logistic modulation map

“…In the past decades, various optical or digital encryption schemes have been investigated for image security, since the well-known double random phase encoding (DRPE) scheme [1] is proposed, in which the image is encrypted into stationary white noise data by multiplying a random phase mask (RPM) in spatial plane and another in the frequency plane. These algorithms make use of Fresnel transform (FrT) [2][3][4], fractional Fourier transform (FrFT) [5][6][7][8][9][10], gyrator transform (GT) [11][12][13], discrete cosine transform (DCT) [14][15][16], fractional angular transform domain [17,18] and others [19][20][21][22]. Alfalou and Brosseau [23] pointed out that these optical techniques can be used for compression operations simultaneously.…”

“…Joshi et al [6] segregated color image into three components which are hidden inside the random masks using base changing rule of logarithms, respectively. Abuturab [11] used the amplitude transmittance of the Fresnel zone plate as structured phase-mask encoding in order to avoid problems arising from misalignment. Zhou et al [18] proposed a nonlinear color image encryption scheme based on the reality preserving fractional Mellin transform.…”