Title :
PC color recognition using LED and software techniques
Author :
Laming, J.E. ; Martino, A.
Author_Institution :
Sch. of Electr. & Comput. Eng., Curtin Univ., Perth, WA, Australia
fDate :
5/1/1993 12:00:00 AM
Abstract :
The authors introduce a color measurement system that has applications in industry, biomedical engineering, and pollution monitoring. A multiple-light-emitting-diode (LED) color source, LED color signal receiver, and a microcontroller drive a PC. The hardware utilizes extremely narrowband (1/3 to 1/100 of a hertz) synchronous detection of 3-10 kHz square-wave pulsed LED outputs, in sequential time sequence. The PC software applies colorimetric theory to the measurement data to determine the measurement object´s CIE chromaticity coordinates. The CIE x, y chromaticity diagram (the horseshoe-shaped rainbow diagram) is reproduced on the PC color video monitor on which the coordinates are plotted. Limitations and extensions of color beyond the PC video display capacity are discussed.<>
Keywords :
colorimetry; computerised instrumentation; light emitting diodes; optical receivers; physics computing; reflectivity; 3 to 10 kHz; CIE chromaticity coordinates; LED; LED color signal receiver; PC color recognition; PC color video monitor; PC software; PC video display capacity; biomedical engineering; chromaticity diagram; color measurement system; color source; colorimetric theory; colour reflectance measurement; hardware; horseshoe-shaped rainbow diagram; industry; light sources; measurement data; microcontroller drive; multiple-light-emitting-diode; pollution monitoring; reflectivity; sequential time sequence; software techniques; square-wave pulsed LED outputs; synchronous detection; Application software; Biomedical engineering; Biomedical measurements; Biomedical monitoring; Coordinate measuring machines; Environmentally friendly manufacturing techniques; Industrial pollution; Light emitting diodes; Pollution measurement; Software measurement;
Journal_Title :
Photonics Technology Letters, IEEE
