Digital video capturing is getting popular with the decreasing price of camcorders and the increasing availability of devices with embedded video cameras such as digital-still cameras, mobile phones and PDAs. While a raw home video is considered as visually non-appealing, having multiple recordings of the same event provides the opportunity to combine audio and video segments from different cameras for improving quality and aesthetics. Mixing content from different recordings requires precise synchronization among the recordings. In most prese ....etc

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Captchas are tests that distinguish human from software botsin an online environment, used to stop bots abusing services intended for humans. Paypal and Yahoo have captchas in their new user registration process, but there are programs toovercome them. Investigate proposals for new kinds of captchas. Captchas are used to prevent bots from using various types of computing services. Applications include preventing bots from taking part in online polls, registering for free email accounts (which may then be used to send spam), and, more recently, ....etc

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Abstract
We investigate the problem of streaming multiplevideos over multi-hop cognitive radio (CR) networks.Fine-Granularity-Scalability (FGS) and Medium-Grain-Scalable(MGS) videos are adopted to accommodate the heterogeneityamong channel availabilities and dynamic network conditions.We obtain a mixed integer nonlinear programming (MINLP)problem formulation, with objectives to maximize the overallreceived video quality and to achieve fairness among the videosessions, while bounding the collision rate with primary usersunder the presen ....etc

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Breaking Audio CAPTCHAs




Introduction

CAPTCHAs are automated tests designed to tell computers and humans apart by
presenting users with a problem that humans can solve but current computer programs
cannot. Because CAPTCHAs can distinguish between humans and computers with high
probability, they are used for many different security applications: they prevent bots from
voting continuously in online polls, automatically registering for ....etc

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i want full seminar report and ppt of the above said topic ....etc

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ABSTRACT
Recent development in multimedia processing and network technologies has facilitated the distribution and sharing multimedia through networks. To increase the security demands of multimedia contents, traditional image content protection schemes use extrinsic approaches, such as watermarking or fingerprinting. However, under many circumstances, extrinsic content protection is not possible. To solve these problems forensic tools via intrinsic fingerprints are developed. Source coding is a common step of natur ....etc

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sir,
Iam BE computer science & engg. student.May i get seminar report and ppt on the topic captcha. ....etc

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Abstract
Security researchers have, for long, devised mechanismsto prevent adversaries from conducting automated networkattacks, such as denial-of-service, which lead to significantwastage of resources. On the other hand, several attempts havebeen made to automatically recognize generic images, make themsemantically searchable by content, annotate them, and associatethem with linguistic indexes. In the course of these attempts, thelimitations of state-of-the-art algorithms in mimicking humanvision have become exposed. In this paper, we ....etc

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Evaluating Existing Audio CAPTCHAs and an Interface Optimized for Non-Visual Use




INTRODUCTION AND MOTIVATION

The goal of a CAPTCHA1 is to dierentiate humans
from automated agents by requesting the solution to a
problem that is easy for humans but dicult for com-
puters. CAPTCHAs are used to guard access to web re-
sources and, therefore, prevent automated agents


Making CAPTCHAs Accessible

Audio CAPTCHAs were introduced soon after their vi-
sual alterna ....etc

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i need algorithms used to generate captchas for my presentation (ppt) and (doc)
....etc

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