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Displaying 51926 - 51950 of 74189

Perceptual Effects of Noise in Digital Video Compression

October 1, 1998
Author(s)
Charles D. Fenimore, John M. Libert, S. A. Wolf
We present results of subjective viewer assessment of video quality of MPEG-2 compressed video containing wide-band Gaussian noise. The video test sequences consisted of 7 test clips (both classical and new materials) to which noise with a peak-signal-to

Ralph Webb: A Pioneering Proselytizer for Enhanced Heat Transfer

October 1, 1998
Author(s)
Mark A. Kedzierski
Ralph Webb, a pioneer in enhanced heat transfer, proselytizes his field for the economic and technical benefit of industry. His mission has been, and always will be, the promotion of enhanced heat transfer technology. As a result, he has been instrumental

Revised Formulas for Diffraction Effects With Point and Extended Sources

October 1, 1998
Author(s)
Eric L. Shirley
Revised formulas to estimated diffraction effects in radiometry for point and extended sources are derived. They are found to work as well as or better than previous formulas. In some instances the formulas can be written in closed form; otherwise, their

Short-Term Stability Measurements of a Germanium Plotodiode Radiometer

October 1, 1998
Author(s)
G Andor, Bettye C. Johnson
This paper describes a general stability measurement method for the short term stability, or repeatability, for radiometers using fixed-point blackbodies [BBs] as radiation sources. A germanium photodiode was used for the detector in the radiometer. The

Technical Accomplishments: Information Technology Laboratory 1998

October 1, 1998
Author(s)
Elizabeth B. Lennon, K K. Simon
The 1998 ITL Technical Accomplishments report documents the activities and achievements of the Information Technology Laboratory, a research component of the National Institute of Standards and Technology. Covering fiscal year 1998, the report presents an

Tensile Testing Low Density Multilayers: Aluminum/Titanium

October 1, 1998
Author(s)
Daniel Josell, D van Heerden, D Shechtman, David T. Read
Yield stresses, ultimate tensile strengths, and specific strengths of aluminum/Titanium multilayer thin films are determined from the results of uniaxial tensile tests. The plasticity in the stress-strain curves. The nature of the fracture surfaces, and

The FERET Verification Testing Protocol for Face Recognition Algorithms

October 1, 1998
Author(s)
S A. Rizvi, P. Jonathon Phillips, H Moon
Two critical performance characterizations of biometric algorithms, including face recogntion, are identification and verification. In face recognition, FERET is the de facto standard evaluation methodology. Identification performance of face recognition

The NIST Chemistry WebBook: A Tool for Chemical Data Access on the Internet

October 1, 1998
Author(s)
Peter J. Linstrom, William G. Mallard
The NIST WebBook is an Internet site that provides access to physical property data from the NIST Standard Reference Data Program. It was designed as a general framework for distributing physical property data. The site currently offers a wide variety of

The NIST DMIS Interpreter: Version 2

October 1, 1998
Author(s)
Thomas Kramer, Frederick M. Proctor, William G. Rippey, Harry A. Scott
The National Institute of Standards and Technology (NIST) DMIS interpreter is a software system that reads control code programs in the DMIS language (described below in Section 1.2), produces calls to a set of canonical commands for coordinate measuring

The NIST DMIS Interpreter: Version 2

October 1, 1998
Author(s)
Thomas R. Kramer, Frederick M. Proctor, William G. Rippey, Harry A. Scott
This report describes an interpreter which reads a file of numerical control code for a coordinate measuring machine (CMM), produces calls to a set of canonical CMM functions, and writes inspection report files. The interpreter is a software system written

Time-Base Nonlinearity Determination Using Iterated Sine-Fit Analysis

October 1, 1998
Author(s)
Gerard N. Stenbakken, J. P. Deyst
A new method is presented to determine the time-base errors of sampling instruments. The method does not require a model for the time-base error and, thus, provides accurate estimates where model-based methods fail. Measurements of sinewaves at multiple
Displaying 51926 - 51950 of 74189
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