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In this paper, we propose a reversible data hiding method based on pixel difference histogram shifting and ripple strategy. Because the local area has similar pixel value distribution in the natural image, the pixel differences will be narrowed down within a small range. The ripple strategy is used to calculate the pixel difference using the pixels in the outer ripple to subtract the pixels in the...
Due to the rapid increase of information in the World Wide Web, there exists an explosion of information on the Web that may overwhelm the common Web user. The Web user may find it quicker or more efficient to browse the Web by reading summaries of Web sites. This paper proposes WebSum to compress Web site content into a summary. WebSum is an enhancement of the SumBasic algorithm, that was mainly...
Authoring context-aware, interactive video representation is usually a complex process. A user-friendly multimedia authoring environment is thus solicited to explore and express users' design ideas efficiently and naturally. In this paper we present a sketch-based two-layer representation, called scene structure graph (SSG), to facilitate the video authoring process. One layer in SSG uses sketches...
This paper proposes a link layer adaptive hybrid FEC/ARQ based on Hops (HH-FEC/ARQ) for Wireless Multimedia Sensor Networks, in the hope that the media could be played on receiving sensor nodes with high quality. The algorithm, based on cross-layer optimization design, adjusting the FEC parameter N and the ARQ parameter Nmax according to the Hops of the link layer frames, can maximize the performance...
Wireless multimedia sensor networks (WMSNs) are a new and emerging type of wireless sensor networks (WSNs), which enable applications of multimedia captured through special sensors equipped with cameras or microphones etc. However, WMSNs face the challenges of transport reliability and energy consumption. In this paper, we propose an adaptive error control mechanism based on the importance of link-layer...
In this paper, mobile multicast mechanism based on IEEE 802.21 MIH (Media Independent Handover) for efficient network resource usage is proposed. Proposed mechanism supports the efficiency of network resource usage and fast multicast handover. The proposed architecture adopts multicast manager concept to MIH framework in order to efficiently perform mobile multicast handover, and adds the new MIH...
In this paper fast mobile multicast mechanism based on IEEE 802.21 MIH (Media Independent Handover) is proposed. We solve long multicast handover delay time caused by L3 movement detection mechanism of the existing mobile multicast methods. The proposed architecture adopts multicast manager concept to MIH framework in order to efficiently perform mobile multicast handover, and adds the new MIH messages...
We have developed the multimedia player based on the Internet. This player can display an image received from the mobile phone or the Web. Also, it can play a received MP3 file. In top face, we can control a volume, shift key for image presentation, display function, so on. And it includes hardware memory for saving a moving image data of the big size.
This paper proposes an enhanced adaptive forward error correction (EAFEC) algorithm based on cross- layer design for wireless media streaming, in the hope that the media could be played on receivers with high quality. This algorithm, which uses the Poisson process to predict the current network condition, can adjust the sending rate of MPEG video frame adaptively and allocate the network bandwidth...
In this paper, the high gain and broadband antenna operating for SDMB (Satellite Digital Multimedia Broadcasting) system is proposed. The proposed antenna consists of the SAP (Shorted Annular Patch) structure, which inhibits surface-wave and the parasitic SAP element with spacing of 0.25 lambda0 in order to improve gain, bandwidth and directivity. The RHCP (Right Hand Circular Polarization) is generated...
In this paper, the reconfigurable annular ring slot antenna with circular polarization diversity is proposed for SDMB(satellite digital multimedia broadcasting) system. The proposed antenna consists of a ring slot with tuning stubs. Four PIN diodes are attached to achieve circular polarization diversity. By switching the diodes on or off, the proposed antenna can be operated either RHCP(right hand...
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