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Search Publications by: Yoshi Ohno (Assoc)

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Displaying 276 - 300 of 391

An Assessment Standard for the Evaluation of Display Measurement Capabilities

November 1, 2000
Author(s)
John M. Libert, Paul A. Boynton, Edward F. Kelley, Steven W. Brown, Yoshi Ohno
A prototype display measurement assessment transfer standard (DMATS) is being developed by NIST to assist the display industry in standardizing measurement methods used to quantify the performance of electronic displays. Designed as an idealized electronic

An AC/DC Technique for the Absolute Integrating-Sphere Method

October 1, 2000
Author(s)
Yoshihiro Ohno, R Kohler, M F. Stock
The Bureau International des Poids et Mesures (BIPM) has historically maintained the results of international intercomparisons of luminous intensity and luminous flux as so-called world-mean values in the form of groups of lamps for more than 60 years. It

CIE Fundamentals for Color Measurements

September 30, 2000
Author(s)
Yoshi Ohno
The paper first overviews the CIE system of colorimetry, covering CIE 1931 color matching functions, XYZ tristimulus values, the x, y diagram, the 1976 u', v' diagram, and the evolvement of CIELUV and CIELAB color spaces and color difference formulae. The

Color Issues of White LEDs

October 1, 2000
Author(s)
Yoshihiro Ohno
For white LEDs to be used for general lighting, they should have appropriate white color and good color rendering performance for illuminated objects. Color rendering, as well as energy efficiency (efficacy), have been the two most important criteria for

Radiometry and Photometry: Review for Vision Optics

January 1, 2000
Author(s)
Yoshihiro Ohno
Radiometry is the measurement of optical radiation, which is electromagnetic radiation in the frequency range between 3 x 10 11 Hz and 3 x 10 16 Hz. This range corresponds to wavelengths between 10 nm and 1000 m, and includes the regions commonly called