The Internet creates an environment suitable to spatial data share, allowing the users to transmit, visualize, manipulate and interact with them. This environment not only allows new opportunities for geospatial data use, but also introduces new problems that must be managed to permit these data to be used in an effective and useful way. One of such problems is related to the use of these data ...

In this work, feedback and error-protection strategies for wireless progressive video transmission are presented and evaluated. Simple but meaningful models for a mobile radio channel are introduced, and a channel-coding system based on high-memory rate-compatible punctured convolutional codes with an appropriate sequential decoding algorithm, the far-end error decoder (FEED), are presented. Fu...

Abstract This is a digest of the work and research completed thus far in developing a progressive image transmission scheme. Efficient and quick communication of perceptually important image information is desired resulting in this research with wavelet and fractal techniques for the identification and extraction of perceptually important features. This is done with the final goal of interactiv...

Due to its applications in marine research, oceanographic, and undersea exploration, underwater communication has been recently under intense investigation. Although underwater communication has been improving its performance (in terms of bandwith, QoS, etc.), image transmission in autonomous underwater vehicles (AUVs) networks is still considered a frontier work. Here, we address the progressi...

Equation Section 1 Robust progressive image transmission over unreliable channels with variable bandwidth requires Multiple Description Coding (MDC) systems that produce highly error-resilient embedded bitstreams. The proposed Embedded Multiple Description Scalar Quantizers (EMDSQ) meet the desired features consisting of a high redundancy level, fine grain rate adaptation and progressive transm...

In this paper, a watermarking for multi-resolution image authentication is proposed. The most important image content with progressive characteristic is taken as the authentication code. The authentication code is then embedded/extracted according to multi-resolution image coding. The experimental results show the validity of the proposed scheme. The significant tampering can be detected firstl...

Video streaming services using Transmission Control Protocol (TCP) as a transport layer protocol— represented by YouTube—are becoming increasingly popular and, accordingly, have come to account for a significant portion of Internet traffic. TCP is greedy; that is, it tries to exhaust the entire bandwidth. Thus, video streaming over TCP tends to unnecessarily take bandwidth from competing traffi...

Progressive transmission represents an effective means for the transmission of spatial data over the web. We classify current implementations of this paradigm as either viewor scale-based, which transmit data in a manner which is a function of the required map region or scale respectively. Although many such approaches exist, the concept of one which is both viewand scale-based has received lit...

A novel channel coding scheme for progressive transmission of large images is proposed. The transmission time, low distortion reconstructed image and low complexity are most concerned in this paper. In the case of medical data transmission, it is vital to keep the distortion level under control as in most of the cases certain clinically important regions have to be transmitted without any visib...

Image watermarking refers to the process of embedding an authentication message, called watermark, into the host image to uniquely identify the ownership. In this paper a novel, intelligent, scalable, robust wavelet-based watermarking approach is proposed. The proposed approach employs a genetic algorithm to find nearly optimal positions to insert watermark. The embedding positions coded as chr...