Mr. Paul A. Boynton Profile

Paul A. Boynton

Electrical Engineer at National Institute of Standards and Technology

SPIE Involvement:

Author

Proceedings Article | 16 May 2006 Paper

LCD display screen performance testing for handheld thermal imaging cameras

Joshua Dinaburg, Francine Amon, Anthony Hamins, Paul Boynton

Proceedings Volume 6207, 62070T (2006) https://doi.org/10.1117/12.666280

KEYWORDS: Thermography, Imaging systems, Cameras, Composites, CCD cameras, LCDs, Charge-coupled devices, Thermal imaging cameras, Toxic industrial chemicals, Standards development

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Handheld thermal imaging cameras are an important tool for the first responder community. As their use becomes more prevalent, it will become important for a set of standard test metrics to be available to characterize the performance of these cameras. A major factor in the performance of the imagers is the quality of the image on a display screen. An imager may employ any type of display screen, but the results of this paper will focus on those using liquid crystal displays. First responders, especially firefighters, in the field rely on the performance of this screen to relay vital information during critical situations. Current research on thermal imaging camera performance metrics for first responder applications uses trained observer tests or camera composite output signal measurements. Trained observer tests are subjective and composite output tests do not evaluate the performance of the complete imaging system. It is the goal of this work to develop a non-nondestructive, objective method that tests the performance of the entire thermal imaging camera system, from the infrared destructive, sensor to the display screen. Application of existing display screen performance metrics to thermal imaging cameras requires additional consideration. Most display screen test metrics require a well defined electronic input, with either full black or white pixel input, often encompassing detailed spatial patterns and resolution. Well characterized thermal inputs must be used to obtain accurate, repeatable, and non-destructive display screen measurements for infrared cameras. For this work, a thermal target is used to correlate the measured camera output with the actual display luminance. A test method was developed to determine display screen luminance. A well characterized CCD camera and digital recording device were used to determine an electro-optical transfer function for thermal imaging cameras. This value directly relates the composite output signal to the luminance of the display screen, providing a realistic characterization of system performance.

Proceedings Article | 10 April 2005 Paper

Comparing methodologies for determining resolution from contrast in projection display systems

Paul Boynton, Edward Kelley

Proceedings Volume 5740, (2005) https://doi.org/10.1117/12.602371

KEYWORDS: Displays, Modulation, Sensors, Image resolution, CCD cameras, Projection systems, Modulation transfer functions, Spatial resolution, Stray light, Standards development

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Proceedings Article | 15 September 2004 Paper

Methods for assessing display measurement capabilities

Paul Boynton

Proceedings Volume 5443, (2004) https://doi.org/10.1117/12.578106

KEYWORDS: Optical filters, Metrology, Sensors, Calibration, Glasses, Diagnostics, Projection systems, Charge-coupled devices, Stray light, Standards development

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

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Proceedings Article | 10 September 2003 Paper

Liquid-filled camera for the measurement of high-contrast images

Paul Boynton, Edward Kelley

Proceedings Volume 5080, (2003) https://doi.org/10.1117/12.519602

KEYWORDS: Optical filters, Scattering, Cameras, Glasses, Particles, Light scattering, CCD cameras, Charge-coupled devices, Surface conduction electron emitter displays, Liquids

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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 | 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 | 26 April 2002 Paper

Stray light compensation in small area contrast measurements of projection displays

Paul Boynton, Edward Kelley

Proceedings Volume 4657, (2002) https://doi.org/10.1117/12.463788

KEYWORDS: Modulation, Reflectivity, Optical testing, CCD cameras, Head, Projection systems, Charge-coupled devices, Stray light, Environmental sensing, Standards development

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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, Visible radiation, Metrology, Calibration, Diagnostics, Display technology, Stray light, Environmental sensing, Prototyping, Standards development

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Proceedings Article | 30 April 2001 Paper

Light-measuring device diagnostics for the photometric and colorimetric measurement of flying-spot displays

Paul Boynton, Edward Kelley

Proceedings Volume 4295, (2001) https://doi.org/10.1117/12.424877

KEYWORDS: Optical filters, Optical spheres, Calibration, Lamps, Diagnostics, Photodiodes, Xenon, Projection systems, Integrating spheres, Optical filtering

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Proceedings Article | 25 April 2000 Paper

Diagnostics for light-measuring devices in flying-spot display measurements

Paul Boynton, Edward Kelley, Susan Highnote, Randy Hurtado

Proceedings Volume 3954, (2000) https://doi.org/10.1117/12.383383

KEYWORDS: Mirrors, Sensors, Lamps, Reflectivity, Diagnostics, Optical testing, Xenon, LCDs, Projection systems, Laser based displays

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Proceedings Article | 12 April 1999 Paper

Stray light elimination in making projection display measurements

Paul Boynton, Edward Kelley

Proceedings Volume 3636, (1999) https://doi.org/10.1117/12.344651

KEYWORDS: Light sources, Reflection, Sensors, Reflectivity, Optical testing, Image sensors, Projection systems, Stray light, Standards development, Light

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Showing 5 of 12 publications

Conference Committee Involvement (1)

Display Metrology II

23 January 2001 | San Jose, CA, United States

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