Mr. John M. Libert Profile

John M. Libert

Physical Scientist at National Institute of Standards and Technology

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Author

Publications (17)

Proceedings Article | 14 April 2010 Paper

Tools for quality control of fingerprint databases

B. Scott Swann, John Libert, Margaret Lepley

Proceedings Volume 7667, 766709 (2010) https://doi.org/10.1117/12.850237

KEYWORDS: Image segmentation, Image quality, Image compression, Biometrics, Image processing, Databases, Iris, Wavelets, Software development, Fingerprint recognition

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Proceedings Article | 28 May 2004 Paper

Projection display metrology at NIST: measurements and diagnostics

Paul Boynton, Edward Kelley, John Libert

Proceedings Volume 5289, (2004) https://doi.org/10.1117/12.527093

KEYWORDS: Standards development, Sensors, Metrology, Stray light, Projection systems, Electronics, Diagnostics, Calibration, Light scattering, Reflection

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Proceedings Article | 8 August 2003 Paper

Current projects in display metrology at the NIST flat panel display laboratory

Paul Boynton, Edward Kelley, John Libert

Proceedings Volume 4826, (2003) https://doi.org/10.1117/12.514542

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Proceedings Article | 8 August 2003 Paper

Color gamut assessment standard: construction, characterization, and interlaboratory measurement comparison

John Libert, Edward Kelley, Paul Boynton, Steven Brown, Christine Wall, Colin Campbell

Proceedings Volume 4826, (2003) https://doi.org/10.1117/12.514538

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In earlier papers, NIST proposed a standard illumination source and optical filter targets with which to assess the state-of-the-art of display measurement. The Display Measurement Assessment Transfer Standard (DMATS) was designed to present the display metrologist with a rectangular array of targets such as color filters, polarizers, and grilles, back-lighted by uniform illumination, to be measured using methods and instruments typically used in display performance measurement. A “round robin” interlaboratory measurement exercise using the “standard” artifact suite would enable a first order assessment of display measurement reproducibility, i.e., measurement variability within the electronic display community. The rectangular array design of the DMATS was anticipated to present stray light and color contamination challenges to facilitate identification of error sources deriving from measurement protocols, laboratory environment, and equipment. However, complications in dealing with heating problems threatened to delay the planned laboratory intercomparison. The Gamut Assessment Standard (GAS) was thus designed as an interim solution to enable the NIST scientists and participating measurement laboratories to begin collecting data. The GAS consists of a 150 mm diameter integrating sphere standard illumination source with a stray light elimination tube (SLET) mounted at the exit port. A dual six-position filter wheel is mounted at the SLET exit port. One wheel holds a series of neutral density filters and a second interchangeable wheel holds various color filters. This paper describes the design and construction of the GAS, its initial performance characterization by NIST, and comparison measurements made at NPL. Possible design changes suggested by the results of the preliminary intercomparison are discussed, as are plans for future interlaboratory comparisons and potential use of the GAS as a transfer standard for laboratory self-certification.

Proceedings Article | 30 April 2001 Paper

Standard illumination source for the evaluation of display measurement methods and instruments

John Libert, Paul Boynton, Edward Kelley, Steven Brown, Yoshihiro Ohno, Farshid Manoocheri

Proceedings Volume 4295, (2001) https://doi.org/10.1117/12.424882

KEYWORDS: Optical filters, Calibration, Prototyping, Standards development, Metrology, Stray light, Visible radiation, Environmental sensing, Diagnostics, Display technology

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Proceedings Article | 2 June 2000 Paper

Video quality experts group: the quest for valid objective methods

Philip Corriveau, Arthur Webster, Ann Rohaly, John Libert

Proceedings Volume 3959, (2000) https://doi.org/10.1117/12.387149

KEYWORDS: Video, Data modeling, Quality measurement, Standards development, Statistical analysis, Statistical modeling, Performance modeling, Analog electronics, Video processing, Semantic video

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Subjective assessment methods have been used reliably for many years to evaluate video quality. They continue to provide the most reliable assessments compared to objective methods. Some issues that arise with subjective assessment include the cost of conducting the evaluations and the fact that these methods cannot easily be used to monitor video quality in real time. Furthermore, traditional, analog objective methods, while still necessary, are not sufficient to measure the quality of digitally compressed video systems. Thus, there is a need to develop new objective methods utilizing the characteristics of the human visual system. While several new objective methods have been developed, there is to date no internationally standardized method. The Video Quality Experts Group (VQEG) was formed in October 1997 to address video quality issues. The group is composed of experts from various backgrounds and affiliations, including participants from several internationally recognized organizations working in the field of video quality assessment. The majority of participants are active in the International Telecommunications Union (ITU) and VQEG combines the expertise and resources found in several ITU Study Groups to work towards a common goal. The first task undertaken by VQEG was to provide a validation of objective video quality measurement methods leading to Recommendations in both the Telecommunications (ITU-T) and Radiocommunication (ITU-R) sectors of the ITU. To this end, VQEG designed and executed a test program to compare subjective video quality evaluations to the predictions of a number of proposed objective measurement methods for video quality in the bit rate range of 768 kb/s to 50 Mb/s. The results of this test show that there is no objective measurement system that is currently able to replace subjective testing. Depending on the metric used for evaluation, the performance of eight or nine models was found to be statistically equivalent, leading to the conclusion that no single model outperforms the others in all cases. The greatest achievement of this first validation effort is the unique data set assembled to help future development of objective models.

Proceedings Article | 2 June 2000 Paper

Toward developing a unit of measure and scale of digital video quality: IEEE Broadcast Technology Society Subcomittee on Video Compression Measurements

John Libert, Leon Stanger, Andrew Watson, Ann Rohaly

Proceedings Volume 3959, (2000) https://doi.org/10.1117/12.387152

KEYWORDS: Video, Video compression, Standards development, Visualization, Quality measurement, Semantic video, Calibration, Image compression, Visual compression, Video processing

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Proceedings Article | 2 June 2000 Paper

Mosquito noise in MPEG-compressed video: test patterns and metrics

Charles Fenimore, John Libert, Peter Roitman

Proceedings Volume 3959, (2000) https://doi.org/10.1117/12.387203

KEYWORDS: Video, Video compression, Sensors, Computer programming, Motion estimation, Quantization, Optical filters, Image compression, Mathematical modeling, Image filtering

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Proceedings Article | 30 May 2000 Paper

Video Quality Experts Group: current results and future directions

Ann Rohaly, Philip Corriveau, John Libert, Arthur Webster, Vittorio Baroncini, John Beerends, Jean-Louis Blin, Laura Contin, Takahiro Hamada, David Harrison, Andries Hekstra, Jeffrey Lubin, Yukihiro Nishida, Ricardo Nishihara, John Pearson, Antonio Pessoa, Neil Pickford, Alexander Schertz, Massimo Visca, Andrew Watson, Stefan Winkler

Proceedings Volume 4067, (2000) https://doi.org/10.1117/12.386632

KEYWORDS: Video, Data modeling, Statistical analysis, Quality measurement, Standards development, Statistical modeling, Video processing, Analog electronics, Performance modeling, Telecommunications

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Proceedings Article | 22 November 1999 Paper

Simulation of graded video impairment by weighted summation: validation of the methodology

John Libert, Charles Fenimore, Peter Roitman

Proceedings Volume 3845, (1999) https://doi.org/10.1117/12.371209

KEYWORDS: Video, Computer programming, Visualization, Video compression, Data modeling, Visual process modeling, Chromium, Calibration, Video processing, Signal to noise ratio

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Proceedings Article | 19 May 1999 Paper

Visibility thresholds for compression-induced image blocking: measurements and models

John Libert, Charles Fenimore

Proceedings Volume 3644, (1999) https://doi.org/10.1117/12.348441

KEYWORDS: Video, Visualization, Visibility, Video compression, Image compression, Image processing, Quantization, Visual process modeling, Sensors, Curium

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Proceedings Article | 3 September 1993 Paper

Determination of viewing aspect by maximization of image symmetry

Joseph Garcia, Harold Szu, Thomas Tsao, John Libert

Proceedings Volume 1955, (1993) https://doi.org/10.1117/12.154991

KEYWORDS: Image sensors, Sensors, Optical correlators, Image processing, Image compression, Data modeling, 3D modeling, Spatial filters, Pattern recognition, Warfare

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Proceedings Article | 3 September 1993 Paper

Rapid method for target motion detection using the spatiotemporal constraint equation

James Wayman, C. Munno, John Libert, Thomas Tsao

Proceedings Volume 1955, (1993) https://doi.org/10.1117/12.154988

KEYWORDS: Motion detection, Image filtering, Cameras, Target detection, Video, Error analysis, Convolution, Image registration, Infrared imaging, Infrared radiation

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Proceedings Article | 3 September 1993 Paper

Target detection using image motion error measure

James Wayman, John Libert, Thomas Tsao

Proceedings Volume 1955, (1993) https://doi.org/10.1117/12.154984

KEYWORDS: Motion measurement, Signal to noise ratio, Error analysis, Gaussian filters, Convolution, Target detection, Image segmentation, Image filtering, Motion estimation, Environmental sensing

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Proceedings Article | 9 July 1992 Paper

Extraction of image motion from one expanded frame

Thomas Tsao, John Libert, Ronald Bauer

Proceedings Volume 1699, (1992) https://doi.org/10.1117/12.138221

KEYWORDS: Cameras, Visualization, Image processing, Image filtering, Linear filtering, Optical flow, Sensors, Eye, Imaging devices, Photography

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Proceedings Article | 1 August 1991 Paper

Fusion of multiple-sensor imagery based on target motion characteristics

Thomas Tsao, John Libert

Proceedings Volume 1470, (1991) https://doi.org/10.1117/12.44838

KEYWORDS: Sensors, Image filtering, Image sensors, Image fusion, Target detection, 3D image processing, Image segmentation, Target recognition, 3D acquisition, Neural networks

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Proceedings Article | 1 July 1990 Paper

Neural network for computing optical flow from spatio-temporal frequencies

Thomas Tsao, Victor Chen, John Libert, Haw-Jye Shyu

Proceedings Volume 1215, (1990) https://doi.org/10.1117/12.18090

KEYWORDS: Sensors, Neural networks, Optical flow, Image sensors, Spatial frequencies, Motion analysis, Optical computing, Computer networks, Visualization, Image analysis

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Showing 5 of 17 publications

Conference Committee Involvement (1)

Photonics for Port and Harbor Security

29 March 2005 | Orlando, Florida, United States

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