Multimedia assessment of pollution potentials of non-sulfur chemical pupling technology /

Mode of access: Internet.

Access to multimedia technology by people with sensory disabilities /

"March 13, 1998."

Planetary cartography in the next decade (1984-1994) /

Mode of access: Internet.

Cartography : rules and practice relating to construction of nautical charts.

At head of title: Serial No. 141. Department of Commerce. U.S. Coast and Geodetic Survey. E. Lester Jones, director.

Transcript of the Federal Interagency Coordinating Committee on Digital Cartography governmentwide meeting : May 20, 1987, Auditorium U.S. Geological Survey.

"May 20, 1987."

The map, XV-XVIII centuries; an exhibition illustrating the history of cartography from the collection of Frederick B. Artz.

"Five hundred copies ... printed."

A lightweight encryption algorithm for mobile online multimedia devices

Online multimedia data needs to be encrypted for access control. To be capable of working on mobile devices such as pocket PC and mobile phones, lightweight video encryption algorithms should be proposed. The two major problems in these algorithms are that they are either not fast enough or unable to work on highly compressed data stream. In this paper, we proposed a new lightweight encryption algorithm based on Huffman error diffusion. It is a selective algorithm working on compressed data. By carefully choosing the most significant parts (MSP), high performance is achieved with proper security. Experimental results has proved the algorithm to be fast. secure: and compression-compatible.

A sensor-based multimedia authentication system

User requirements of multimedia authentication are various. In some cases, the user requires an authentication system to monitor a set of specific areas with respective sensitivity while neglecting other modification. Most current existing fragile watermarking schemes are mixed systems, which can not satisfy accurate user requirements. Therefore, in this paper we designed a sensor-based multimedia authentication architecture. This system consists of sensor combinations and a fuzzy response logic system. A sensor is designed to strictly respond to given area tampering of a certain type. With this scheme, any complicated authentication requirement can be satisfied, and many problems such as error tolerant tamper method detection will be easily resolved. We also provided experiments to demonstrate the implementation of the sensor-based system