Fast watermark detection scheme for camera-equipped cellular phone

Abstract

Digital watermarking technology would be very useful as part of a related service introduction system (RSIS); this system provides related information to content, and the function of watermark in RSIS is analogous to that of barcode, i.e., watermark binds content ID to analog content such as an image on printed material.In this paper, we focus on a camera-equipped cellular phone used as a terminal for RSIS, and propose a fast watermark detection scheme from a captured image. The proposed scheme consists of two processes, one is to correct geometric distortion of the captured image, and the other is to detect watermark information from the rectified image. We also propose a new watermarking algorithm which is robust against small geometric distortion and suitable for the proposed scheme. Moreover, we introduce a quantitative evaluation method for indicating detection reliability, which is indispensable for RSIS service.Finally, we show that the proposed scheme enables users to detect embedded information in approximately one second, even when implemented as a Java application on a cell phone with limited resources, and report experiments that confirm the proposed scheme's efficiency.

Development of Compression Tolerable and Highly Implementable Watermarking Method for Mobile Devices

“…To protect the ownership of such digital content, recent research has been focused on mobile-dedicated watermarking algorithms. Mobile devices can deal with several types of multimedia data, and lots of research for example has applied watermarking algorithms for digital images [2], [3], analog images [4], movies [5], and audio content [6]. Thus, mobile devices especially need to execute several operations in real-time for end-users.…”

Digital watermarking of color images utilizing mobile platforms

“…In the context of mobility, Nakamura et al [4] used a cell phone camera to detect the watermark in an image. In their scheme, a frame is placed around the image to rectify geometric distortion that occurs when photographing.…”

A two-factor authentication system using Radio Frequency Identification and watermarking technology

“…It is believed that digital watermark technology can protect the tag from being cloned by malicious parties, thereby enhancing the authentication measure. Digital watermarking is the process of embedding information into a digital signal in a way that is difficult to remove [30]. This technology makes imperceptible changes in the luminance of a selected area of an image which is undetectable by humans, but can be read by a machine.…”