An optical image cryptosystem based on Hartley transform in the Fresnel transform domain

2011 ◽  
Vol 284 (13) ◽  
pp. 3243-3247 ◽  
Author(s):  
Hone-Ene Hwang
Keyword(s):  
Optical Image ◽  
Transform Domain ◽  
Hartley Transform ◽  
Fresnel Transform ◽  
Image Cryptosystem

Optical multiple-image encryption based on phase encoding algorithm in the Fresnel transform domain

2012 ◽  
Vol 44 (7) ◽  
pp. 2238-2244 ◽  
Author(s):  
Jian-Ji Huang ◽  
Hone-Ene Hwang ◽  
Chun-Yuan Chen ◽  
Ching-Mu Chen
Keyword(s):  
Image Encryption ◽  
Transform Domain ◽  
Phase Encoding ◽  
Multiple Image ◽  
Fresnel Transform

Genetic-Algorithm-Based Optimization of Fragile Watermarking in Discrete Hartley Transform Domain

2016 ◽  
pp. 103-127
Author(s):  
Sudipta Kr Ghosal ◽  
Jyotsna Kumar Mandal
Keyword(s):  
Genetic Algorithm ◽  
Color Images ◽  
Fragile Watermarking ◽  
Transform Domain ◽  
One Dimensional ◽  
Discrete Hartley Transform ◽  
Hartley Transform ◽  
Message Digest ◽  
Simulation Results ◽  
Watermarking Scheme

In this chapter, a fragile watermarking scheme based on One-Dimensional Discrete Hartley Transform (1D-DHT) has been proposed to verify the authenticity of color images. One-Dimensional Discrete Hartley Transform (1D-DHT) converts each 1 x 2 sub-matrix of pixel components into transform domain. Watermark (along with a message digest MD) bits are embedded into the transformed components in varying proportion. To minimize the quality distortion, genetic algorithm (GA) based optimization is applied which yields the optimized component corresponding to each embedded component. Applying One-Dimensional Inverse Discrete Hartley Transform (1D-IDHT) on 1 x 2 sub-matrices of embedded components re-generates the pixel components in spatial domain. The reverse approach is followed by the recipient to retrieve back the watermark (along with the message digest MD) which in turn is compared against the re-computed Message Digest (MD') for authentication. Simulation results demonstrate that the proposed technique offers variable payload and less distortion as compared to existing schemes.

scholarly journals Angle Multiplexing Optical Image Encryption in the Fresnel Transform Domain Using Phase-Only Computer-Generated Hologram

Photonics ◽  
2019 ◽  
Vol 7 (1) ◽  
pp. 1 ◽  
Author(s):  
Hsuan T. Chang ◽  
Yao-Ting Wang ◽  
Chien-Yu Chen
Keyword(s):  
Computer Simulation ◽  
Image Quality ◽  
Image Encryption ◽  
Correlation Coefficients ◽  
Security Level ◽  
Transform Domain ◽  
Computer Generated Hologram ◽  
Fresnel Transform ◽  
Simulation Results ◽  
Optical Image Encryption

We propose an angle multiplexing method for optics-based image encryption using a phase-only computer-generated hologram (POCGH) in the tilted Fresnel transform (TFrT) domain. Modified Gerchberg-Saxton algorithms, based on the three types of rotation manipulation in both the hologram and reconstruction planes, are used with their corresponding TFrT parameters to extract the phase-only functions (POFs) of the target images. All the extracted POFs are then phase-modulated and summed to obtain the final POCGH, which is capable of multiplexing and avoiding overlap in the reconstructed images. The computer simulation results show that the images corresponding to the various rotation manipulations at the hologram and image reconstruction planes can be successfully restored with high correlation coefficients. Due to the encrypted nature of the multiplexed images, a higher system security level can be achieved, as the images can only be correctly displayed when all the required parameters in the TFrT are available. The angle sensitivity on the image quality for each manipulation is also investigated.

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