With the increasing popularity of digital video communications over packet switching networks such as the Internet and wireless networks, error control techniques have become a critical research area. Due to its excellent scalability and performance, embedded 3-D zerotree wavelet video compression has great potential in nonconversational scalable video streaming applications. Although error con...

Is there life after video coding standards? One might think that research has no room to advance with the video coding standards already defined. On the contrary, exciting research opportunities arise after the standards are specified. In this paper, we introduce two standard-related research areas: rate shaping and error concealment, as examples of interesting research that finds its context i...

This paper presents an error concealment technique for image transmission in JPEG2000 for the lowest frequency coefficients. The proposed method uses the layer structure that is a feature of the JPEG2000. The most significant layer is hidden in place of the lowest layer of the bit stream. After transmission this embedded layer is used for error concealment. The bit stream encoded using the prop...

The perceived lateral position of a transmitted beam, upon propagating through a slab made of homogeneous, isotropic, dielectric material at an oblique angle, can be controlled through varying the velocity of the slab. In particular, by judiciously selecting the slab velocity, the transmitted beam can emerge from the slab with no lateral shift in position. Thereby, a degree of concealment can b...

the present study aimed at investigating the possible impact ofzone of proximal development (zpd) on the learners’ performance. forty-sixiranian university students participated in this study by taking two types of readingcomprehension tests (i.e., the main idea and wh-question type). the researchersused the winstep program to analyze the data and estimate the learners’ raschmeasure in pre, pos...

Video transmission over noisy channel leads to errors on video, which degrades the visual quality noticeably and makes error concealment an indispensable job. One approach that is especially suited for applications with real-time constraints, limited bandwidth, or multicast distribution, is to conceal the information loss at the receiver. In this paper we focused on hybrid concealment mechanism...