Learn More
Different communication media create different shopping experiences, e.g., the phone vs. the web. In this study, we examined the early formation of trust and the likelihood that a shopper will return to a website for subsequent purchases. Consumers were asked to select a blender as a gift for someone they knew using one of four types of user interfaces: (1)(More)
—Traditional scalable video encoders sacrifice coding efficiency to reduce error propagation because they have avoided using enhancement-layer (EL) information to predict the base layer (BL) to prevent the error propagation termed " drift ". Drift can produce very poor video quality if left unchecked. In this paper, we propose a video coder with(More)
The increasing popularity of multimedia streaming applications introduces new challenges in content distribution. Web-initiated multimedia streams typically experience high start-up delay, due to large protocol overheads and the poor delay, throughput, and loss properties of the Internet. Internet service providers can improve performance by caching the(More)
In this paper we review and discuss some of the current efforts and proposals in the standardization bodies IETF and MPEG for the delivery of MPEG-4 over IP. We address the issues of payload format and media control by describing two architec-tures that allow for MPEG-4 streaming. Finally, we describe some MPEG-4 over IP streaming experiments in which the(More)
In large-scale IPTV systems, it is essential to maintain high service quality while providing a wider variety of service features than typical traditional TV. Thus service quality assessment systems are of paramount importance as they monitor the user-perceived service quality and alert when issues occurs. For IPTV systems, however, there is no simple(More)
Communication and commerce by web or phone creates benefits and challenges for both buyer and seller. Websites provide convenience and visualization; telephones provide voice and real-time interaction. To combine key elements of these experiences, we developed PhoneChannel. Using PhoneChannel, a PC user while talking on the telephone can display visuals on(More)
—In this paper, a configurable coding scheme is proposed and analyzed with respect to computational complexity and distortion (C-D). The major coding modules are analyzed in terms of computational C-D in the H.263 video coding framework. Based on the analyzed data, operational C-D curves are obtained through an exhaustive search, and the Lagrangian(More)
In this paper we propose a novel bit allocation scheme for MPEG-2 CBR video coding using a model of the early stages of human vision. On the basis of this model we derive a measure of the macroblock activity diierent from the one proposed in the MPEG-2 test model 5 (TM5). Experiments, obtained by substituting the proposed perceptual activity measure to the(More)