Data Hiding in a Hologram by Modified Digital Halftoning Techniques

Wang, Hsi-Chun; Wang, Wei-Chiang

doi:10.1007/11553939_152

Cited by 3 publications

(3 citation statements)

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“…Wang et al [1] proposed a method for watermarking a dot matrix hologram. For embedding the watermark they used a modified halftoning technique exclusively designed for dot matrix color hologram.…”

Section: Introductionmentioning

confidence: 99%

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Watermark Recovery from a Dual Layer Hologram with a Digital Camera

et al. 2011

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Abstract. In this paper we present a method for reading a watermark from a dual layer hologram image with a digital camera. Here the base of the hologram out of which the hologram was designed is a binary image. The hologram obtained is placed on a planar surface and an image is captured from the hologram by setting up a light source and a digital camera on appropriate distances and angles relative to the hologram. The captured image is corrected from affine distortions and a saliency detector based segmentation is performed for the image. The watermark is read from the resulting reconstructed binary image. The obtained results show that the watermark can be recovered perfectly from a dual layer hologram with a proper setting of the camera and light sources.

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Section: Introductionmentioning

confidence: 99%

“…However, there are many hologram techniques available and here a dual layer hologram as shown in Fig. 1 was manufactured and used instead of a dot matrix hologram as in [1]. The hologram consists of a background image and foreground image layers.…”

Section: Introductionmentioning

confidence: 99%

Watermark Recovery from a Dual Layer Hologram with a Digital Camera

et al. 2011

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“…Dot matrix holography is devised by Frank Davis in 1980s. This dot-matrix hologram, or embossed hologram, has been extensively adopted by secured document, banknote and package in recent years [2,4,5]. Two laser beams focus on a photoresist, and the interference grating is recorded [2,3].…”

Section: Introductionmentioning

confidence: 99%

Hologram-based Interactive Video/Audio System

Wang

Yang

2006

TENCON 2006 - 2006 IEEE Region 10 Conference

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The objective of this study is to develop an interactive system that can synthesize audio in accordance with the variations in brightness of the diffracted light from a dot matrix hologram, which is composed of many gratings with varied orientations and pitches. The diffracted light is converted into audio signals with different pitches and tempos. In order to improve the accuracy of timing of the synthesized audio from the hologram, the fundamental concept of diffraction and signal processing are used.The results show that this interactive system successfully synthesizes audio according to the variations of the diffractive lights from the hologram. This real-time interactive system has great potential to creative art presentation, e-learning, game development and anti-counterfeiting applications.

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