Akamai o ers the largest Content Delivery Network (CDN) service in the world. Building upon its CDN, it recently started to offer High De nition (HD) video distribution using HTTP-based adaptive video streaming. In this paper we experimentally investigate the performance of this new Akamai service aiming at measuring how fast the video quality tracks the Internet available bandwidth and to what...

A special case of multiple frame prediction is the dual frame buffer, where an encoder uses both an immediate past frame and a long term past frame for motion compensation. Using a dual frame buffer together with intra/inter mode switching improves the compression performance of the coder. In this work, we investigate the effect of feedback in making better mode-switching decisions in the conte...

When a student has a high sense of self-efficacy, foreseeing success and providing positive guides and supports for performing the skill will usually occur. A low self-efficacy tends to predict failure and anticipation of what could go wrong. Videotape feedback provided to students has reported favorable outcomes. Self-efficacy could alter performance in learning a psychomotor competency skill ...

For different reasons, many viewers like to watch a summary of films without having to waste their time. Traditionally, video film was analyzed manually to provide a summary of it, but this costs an important amount of work time. Therefore, it has become urgent to propose a tool for the automatic video summarization job. The automatic video summarization aims at extracting all of the important ...

BACKGROUND Providing augmented visual feedback is one way to enhance robot-assisted surgery (RAS) training. However, it is unclear whether task specificity should be considered when applying augmented visual feedback. METHODS Twenty-two novice users of the da Vinci Surgical System underwent testing and training in 3 tasks: simple task, bimanual carrying (BC); intermediate task, needle passing...

This study surveys current trends/methods in video retrieval. The major themes covered by the study include shot segmentation, key frame extraction, feature extraction, clustering, indexing and video retrieval-by similarity, probabilistic, transformational, refinement and relevance feedback. This work has done in an aim to assist the upcoming researchers in the field of video retrieval, to know...

there is a wide range of applications in video retrieval and indexing grabbing researcher’s attention. The following paper includes tutorial as well as a description of the background to common approaches in visual content-based video retrieval and indexing. The focal point is on the mechanisms of video shot boundary detection, key frame extraction, structure analysis, and scene segmentation, a...

In this paper, we discuss a design of a real-time DV (Digital Video) streaming system, which dynamically adjusts packet transmission rate from the source host according to feedback information from the network. In our DV streaming system, the destination host continuously notifies the source host of network status (e.g., the end-to-end packet transmission delay and the packet loss probability i...

0020-0255/$ see front matter 2011 Elsevier Inc doi:10.1016/j.ins.2011.05.018 ⇑ Corresponding author. Tel.: +65 65164654. E-mail addresses: [email protected] (H. Lu This paper introduces an effective interactive video retrieval system named VisionGo. It jointly explores human and computer to accomplish video retrieval with high effectiveness and efficiency. It assists the interactive video re...

In this work we present a video transmission system for packet lossy channels based on the Progressive Texture Video Coding (PTVC) algorithm. A posteriori video rate control on the progressively coded messages is simplified significantly as for rate adaptation only the later part of this message can be truncated. This property is used by an appropriate unequal erasure protection (UXP) scheme wh...