Watermark recovery from a dual layer hologram with a digital camera
Anu Pramila,Anja Keskinarkaus,Esa Rahtu,Tapio Seppänen +3 more
- pp 146-155
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TLDR
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.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.read more
Citations
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Efficient Verification of Holograms Using Mobile Augmented Reality
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AR-based Hologram Detection on Security Documents using a Mobile Phone
TL;DR: A real time method to automatically detect holograms in images acquired with a standard smartphone and demonstrates the plausibility of the method using a variety of security documents, which are common in everyday use.
Reading watermarks with a camera phone from printed images
TL;DR: The aim of this thesis is to research the process in which the watermarked image is printed and then read with a digital camera or a camera phone from the printed image, especially for the situations when the capturing angle is large.
Proceedings ArticleDOI
Mobile user interfaces for efficient verification of holograms
TL;DR: Several user interfaces for hologram verification are presented, aiming to noticeably reduce verification time, and it is indicated that there is a significant difference in capture time between interfaces but that users do not prefer the fastest interface.
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Towards Mobile Recognition and Verification of Holograms Using Orthogonal Sampling
TL;DR: A series of designs for holograms suitable for mobile verification support the orthogonal sampling of elements within a constrained space along with an assessment of the capture conditions and evaluated these designs regarding their verification performance and task completion time.
References
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Ching-Yung Lin,Shih-Fu Chang +1 more
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Proceedings ArticleDOI
Secure and invisible data hiding in 2-color images
Yu-Chee Tseng,Hsiang-Kuang Pan +1 more
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