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Earlier research has shown the efficacy of using geometry discontinuities, encoded using “breakpoints,” in improving the coding efficiency of piecewise smooth media, such as depth maps and motion flows. This work proposes a new structure for encoding these breakpoints that is more suited for piecewise affine media, such as affine motion flows. Here, we choose to employ belief propagation over a graphical...
This paper proposes a set of architectural patterns for the design of interoperable image search&retrieval systems on top of the latest standards in the area, ISO/IEC 15938-12 (MPEG Query Format) and ISO/IEC 24800 (JPSearch). The work introduces the notion of a "composable metadata model" as a means to allow the usage of multiple metadata ontologies together, along with mechanisms to...
In the era of universal multimedia access (UMA), applications like video conferencing, surveillance and streaming are challenged by the multiplicity of devices. Since adaptation is the newly applied practice for digital video content customization, in this demo, we present a simple approach to adapt H.264 videos, in the compressed domain, for heterogeneous devices and mobile environments. Our approach...
This article presents a very simple model based on gamma functions for MPEG1 and MPEG2 VBR digital video. This model is a simplification of Frey's et al model.It captures first grade statistics and the cyclicity of the autocorrelation function. Buffer overflow losses with the proposed model are of the same magnitude that buffer overflow losses of the original video clips. We have found three zones...
Here, we present a new method for benchmarking multi-media related algorithms by providing a Web-based architecture able to continuously update (1) the relevant data set through a common representation based on MPEG-4, and (2) the set of algorithms by an open API. The platform benchmark results are updated in real-time and presented for each media, for each group of media or for the entire database...
We propose a scalable, robust and recovery-driven multimedia content authentication system which exploits content-based robust hashing and watermark embedding to provide effective integrity verification of multimedia content. In addition, we propose providing content recovery by exploiting the collaborative decentralized nature of P2P networks. In this paper, we focus on the issues pertaining to the...
As content serviced for IP set-top boxes is mostly streamed over IP network, the existing hacking tools for IP network can be used to capture the streamed content. Until recently, most of the content serviced on IP set-top boxes have been MPEG-2 TS. But it is being moved to WMV, MPEG-4 or H.264 gradually because of the compression efficiency. In this paper, we propose a DRM scheme other than WMRM...
Due to resource constraints, digital image transmissions are a significant challenge for image sensor based wireless sensor networks (WSN). In this paper, we propose a novel robust and energy-efficient scheme, called image component transmission (ICT) in WSN by providing various levels of reliability during image transmissions. Essential components such as the information for the positions of significant...
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