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Comparison of Video Color/Trash Meters for Measurements on Cotton

Anthony, W. Stanley
Applied engineering in agriculture 1989 v.5 no.1 pp. 18-23
USDA, agricultural engineering, color, high volume instruments, lint cotton, marketing, process control, reflectance, seed cotton
The Agricultural Marketing Service of the U.S. Department of Agriculture uses a color meter as part of a High Volume Instrument classification system for lint cotton and is considering combining it with a trash meter for measurement of the trash in lint. Duplicate measurements on seed cotton and lint were used to compare two of the combined color/trash meters. Reflectance, color, area, count and trash measurements were significantly different between the two meters; however, Plus b measurements on ginned lint were not. Regression comparison of measurements by the two meters yielded R2 values (coefficients of determination) ranging from 0.55 for seed cotton Plus b to 0.94 for lint reflectance. Regression of the area and count (number) of trash particles in seed cotton indicated by the trash meters were well correlated, R2 = 0.89 and 0.91, respectively. Results indicate that the color/trash meters are sufficiently accurate for measurement of color and trash and for subsequent incorporation in a gin process control system, but each meter must be calibrated separately.