Watermarks encrypted in the cascaded Fresnel digital hologram

Deng, Shaogeng; Liu, Liren; Lang, Haitao; Dong, Zhao; Liu, Ximin

doi:10.1016/j.ijleo.2006.03.024

Cited by 11 publications

(7 citation statements)

References 14 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Significant advantages of the proposed cascadedphase-mask-based encoding system and some explanations are further summarized as follows. (1) In the proposed optical cryptosystem, a 3D processing strategy is successfully integrated, and higher security can be achieved compared with conventional optical image encryption based on cascaded phase-only masks [15,[28][29][30][31]. It has also been demonstrated that cryptosystem security can be further enhanced with the fixed phase-only masks placed in the optical path, and arbitrary one sectional decryption cannot render information about the plaintext during the decryption.…”

Section: Cascaded Phase-only Masks In the Frft Domainmentioning

confidence: 98%

“…In this study, we have effectively converted 2D plaintexts into a series of particles distributed in 3D space for optical image encryption, and a modified Gerchberg-Saxton algorithm has been applied to extract the phase-only masks during the encryption. Many fixed phase-only masks (see figure 4) can also be used in the proposed optical cryptosystem to achieve higher security compared with conventional optical image encryption methods [11][12][13][14][15][16][28][29][30][31]. It can be expected that the proposed phase retrieval algorithm in this study might also be applied to generate 3D beam profiles [32][33][34]37] in the near or far field for some applications.…”

Section: Cascaded Phase-only Masks In the Frft Domainmentioning

confidence: 99%

See 1 more Smart Citation

Optical image encryption based on phase retrieval combined with three-dimensional particle-like distribution

Chen

Sheppard

2012

J. Opt.

View full text Add to dashboard Cite

We propose a new phase retrieval algorithm for optical image encryption in three-dimensional (3D) space. The two-dimensional (2D) plaintext is considered as a series of particles distributed in 3D space, and an iterative phase retrieval algorithm is developed to encrypt the series of particles into phase-only masks. The feasibility and effectiveness of the proposed method are demonstrated by a numerical experiment, and the advantages and security of the proposed optical cryptosystems are also analyzed and discussed.

show abstract

Section: Cascaded Phase-only Masks In the Frft Domainmentioning

confidence: 98%

Section: Cascaded Phase-only Masks In the Frft Domainmentioning

confidence: 99%

Optical image encryption based on phase retrieval combined with three-dimensional particle-like distribution

Chen

Sheppard

2012

J. Opt.

View full text Add to dashboard Cite

show abstract

“…Watermarking can be implemented in a cascaded phase only mask architecture [29][30][31][32][33][34][35] with phase retrieval algorithms. This architecture differs from the general framework shown in Fig.…”

Section: Watermarking With Cascaded Phase Only Mask Architecturementioning

confidence: 99%

“…The two phase-only masks are generated by iterative projections onto constraint sets (POCS) algorithm, with the host image placed in the input plane and the hidden image planed at the imaging plane. When the host image and two corresponding computed phase masks are placed in the cascaded Fresnel transform system [29,30], the hidden image (watermark image) can be observed in the imaging result.…”

Section: Watermarking With Cascaded Phase Only Mask Architecturementioning

confidence: 99%

Review on optical image hiding and watermarking techniques

Jiao

Zhou

et al. 2019

Optics & Laser Technology

139

View full text Add to dashboard Cite

Information security is a critical issue in modern society and image watermarking can effectively prevent unauthorized information access. Optical image watermarking techniques generally have advantages of parallel high-speed processing and multi-dimensional capabilities compared with digital approaches. This paper provides a comprehensive review on the research works related to optical image hiding and watermarking techniques conducted in the past decade.The past research works are focused on two major aspects, various optical systems for image hiding and the methods for embedding optical system output into a host image. A summary of the state-of-the-art works is made from these two perspectives.

show abstract

“…Our method belongs to the latter category. Although techniques for hiding images in gray holograms have been developed in the past (such as [20][21][22]), embedding additional information requires modifying the original intensities of certain pixels to different values within a dynamic range. As such, these methods are not applicable to a binary hologram as the intensity of each pixel in the latter can only be either black or white.…”

Section: Introductionmentioning

confidence: 99%

Intensity image-embedded binary holograms

2012

View full text Add to dashboard Cite

Past research has demonstrated that, by downsampling the source object scene in multiple directions, a binary Fresnel hologram can be generated to preserve favorable quality on the reconstructed image. In this paper, we will show that a binary hologram generated with such an approach is also insensitive to noise contamination. On this basis, we propose a method to embed an intensity image into the binary hologram. To prevent the embedded information from being tampered or retrieved with unauthorized means, scrambling is applied to relocate each pixel to a unique position in the binary hologram according to a random assignment that is only known with the availability of a descrambling key. Experimental results demonstrate that our proposed method is capable of embedding an intensity image that is one quarter the size of the binary hologram without causing observable degradation on the reconstructed image. In addition, the embedded image can be retrieved with acceptable quality even if the binary hologram is damaged and contaminated with noise.

show abstract

Watermarks encrypted in the cascaded Fresnel digital hologram

Cited by 11 publications

References 14 publications

Optical image encryption based on phase retrieval combined with three-dimensional particle-like distribution

Optical image encryption based on phase retrieval combined with three-dimensional particle-like distribution

Review on optical image hiding and watermarking techniques

Intensity image-embedded binary holograms

Contact Info

Product

Resources

About