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Quantifying Turfgrass Color Using Digital Image Analysis

Dep. of Horticulture, Univ. of Arkansas, 308 Plant Sci. Building, Fayetteville, AR 72701

View larger version (33K): [in a new window]   Fig. 1. Quantifying turfgrass color in the hue, saturation, and brightness (HSB) color space. (A) The hue is measured on a continuous scale from 0 to 360°. Turfgrass hues are typically between 70° and 110°. (B) For a specific turfgrass hue, here 90°, the saturation and brightness levels affect how dark green the color appears.

View larger version (25K): [in a new window]   Fig. 2. Linear regression analysis between hue quantified by digital image analysis and the actual hue of Munsell plant tissue color chips.

View larger version (27K): [in a new window]   Fig. 3. Linear regression analysis between color saturation quantified by digital image analysis and the actual color saturation of Munsell plant tissue color chips.

View larger version (26K): [in a new window]   Fig. 4. Linear regression analysis between color brightness quantified by digital image analysis and the actual color brightness of Munsell plant tissue color chips.

View larger version (77K): [in a new window]   Fig. 5. Color analysis of various turfgrass plots. (A) The plot receiving the higher N rate has a darker green color as a result of an increased hue angle and decreased brightness level. (B) ‘Shanghai’ bermudagrass has darker green color, the result of significantly decreased saturation level when compared with ‘Mini-Verde’. H, hue; S, saturation; B, brightness.