Embedding intensity image in grid-cross down-sampling (GCD) binary holograms based on block truncation coding

Tsang, P. W. M.; Poon, Ting‐Chung; Jiao, Shuming

doi:10.1016/j.optcom.2013.04.019

Cited by 15 publications

(3 citation statements)

References 18 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…However, the results of the down-sampling method have a prominent texture of regularly that is spaced voids in the shaded regions. To solve this problem, an enhanced method based on grid-cross downsampling (GCD) has been proposed (Cheung et al, 2011;Tsang et al, 2013). The reconstructed images of these methods have proved that the speckle noise can be suppressed effectively.…”

Section: Non-iterative Methodsmentioning

confidence: 99%

Speckle Noise Suppression Algorithm of Holographic Display Based on Spatial Light Modulator

Chen

Lee

et al. 2022

Front. Photon.

View full text Add to dashboard Cite

Holography has emerged as one of the most attractive three-dimensional display technologies. With the technological development of computer science and coherent light source, the computer-generated holography has been applied in many fields. However, the speckle noise of the holographic reconstructed image seriously affects the viewing experience. In this paper, the cause of speckle noise generation in holographic display is introduced. Then, discussions about the speckle noise suppression methods are provided. The discussions are categorized into iterative and non-iterative approaches. Besides, we also introduce other speckle noise suppression techniques which are proposed from the perspective of light coherence, human visual system and optical system. Finally, the prospects of different types of approaches are summarized.

show abstract

Section: Non-iterative Methodsmentioning

confidence: 99%

Speckle Noise Suppression Algorithm of Holographic Display Based on Spatial Light Modulator

Chen

Lee

et al. 2022

Front. Photon.

View full text Add to dashboard Cite

show abstract

“…The embedding of a grayscale intensity image into a binary host hologram in a robust manner is investigated [69][70][71]. The grayscale image is encoded as binary bits by error diffusion based binarization [69], block truncation coding [70] or JPEG-BCH coding [71] and then embedded into a binary hologram by random scrambling. The preservation of host hologram quality after watermarking is one crucial issue in watermarking processing.…”

Section: Digital Watermarking For Hologramsmentioning

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

“…So, the error occurs when the phase-only hologram is used for reconstruction, and this error will be reflected by the speckle noise in the reconstructed image. In order to suppress the speckle noise in the holographic display, many optimization algorithms have been proposed, such as the time average method [19][20], down-sampling method [21][22], complex amplitude modulation method [23][24], pixel separation method [25], error diffusion method [26][27] and the numerical Multi-Look method [28][29]. The pixel separation method reduces the overlap between the Airy disks by increasing the distance between the adjacent pixels.…”

Section: Introductionmentioning

confidence: 99%

Method of Speckle Noise Suppression for Holographic Zoom Display Based on Layered-Pixel-Scanning Algorithm

Wang

Chang

et al. 2020

IEEE Access

View full text Add to dashboard Cite

In this paper, a method of speckle noise suppression for holographic zoom display based on layered-pixel-scanning (LPS) algorithm is proposed. Different from the traditional algorithm, the proposed method suppresses the speckle noise based on a new algorithm design and light source optimization. The LPS algorithm is designed to calculate the phase-only hologram of the 3D object. By extracting the initial complex hologram of the 3D object and scanning the hologram by pixel, the errors of the complex amplitude can be reduced as much as possible. Then a hologram subsampling method based on the LPS algorithm generated is proposed, so the scaling of the reproduced image can be achieved easily. At the same time, the pattern with different random phase is generated and loaded on the spatial light modulator so that the reconstructed light can be optimized. When the optimized light irradiates on the phase hologram of the object, the reconstructed image with suppressed speckle noise can be displayed. The experimental results show that the proposed method has an excellent reproduction effect. Moreover, the feasibility and unique advantages of the proposed method in the holographic augmented-reality display, zoom display and multiplane display have been proved. We believe that this method can promote the application of the holographic display.

show abstract

Embedding intensity image in grid-cross down-sampling (GCD) binary holograms based on block truncation coding

Cited by 15 publications

References 18 publications

Speckle Noise Suppression Algorithm of Holographic Display Based on Spatial Light Modulator

Speckle Noise Suppression Algorithm of Holographic Display Based on Spatial Light Modulator

Review on optical image hiding and watermarking techniques

Method of Speckle Noise Suppression for Holographic Zoom Display Based on Layered-Pixel-Scanning Algorithm

Contact Info

Product

Resources

About