Accession Number:

ADA191922

Title:

Design and Testing of a Luminance and Chrominance Stabilization System for a Computer-Controlled Color Display.

Descriptive Note:

Final rept. Mar 84-Jul 87,

Corporate Author:

VIRGINIA POLYTECHNIC INST AND STATE UNIV BLACKSBURG HUMAN FACTORS LAB

Personal Author(s):

• Farley, Willard W.

Report Date:

1987-07-01

Pagination or Media Count:

147.0

Abstract:

The improvements in computer display technology have made it possible for researchers in color vision to make use of this technology to generate stimuli for color research. The early research has shown the tremendous advantages of this technique in the large number of different stimuli that can be presented in a single experiment. Unfortunately, the early research also highlighted several problems with the computer display system. One of the major problems is the computer display is not constant over time. This report outlines a Feedback Control System that may be connected to any computer display system whose video bandwidth is lower than 50 MHz. The system receives light from a red, green and blue area of the screen that is always commanded to the same intensity level via three detectors. The signal from the detectors is used as the reference signal and in a feedback control system such that the luminance of each of three guns of the display is made to have a constant output. A single-channel version can also be constructed to stabilize the luminance of a monochrome CRT.

Descriptors:

• *COLORS
• *DISPLAY SYSTEMS
• *LUMINANCE
• BANDWIDTH
• CATHODE RAY TUBES
• COLOR VISION
• COMPUTER APPLICATIONS
• COMPUTERS
• CONTROL
• CONTROL SYSTEMS
• DETECTORS
• FEEDBACK
• INTENSITY
• MONOCHROMATIC LIGHT
• OUTPUT
• SIGNALS
• STABILIZATION SYSTEMS
• VIDEO SIGNALS
• COMPUTER GRAPHICS

Subject Categories:

• Computer Hardware

Distribution Statement:

APPROVED FOR PUBLIC RELEASE