Evaluation of Sensing and Machine Vision Techniques in Stress Detection and Quality Evaluation of Turfgrass Species

The utility of different image sensing and non-image sensing techniques was also studied in objectively evaluating turfgrass quality parameters like, color, density and texture from National Turfgrass Evaluation Program trials. Image sensing took the greatest amount of time, while non-image sensing techniques were the fastest among the evaluated methods. All methods showed significant differences in cultivars for color in different trials. The quantified hue values from the multispectral camera were the least correlated with other evaluation techniques. Both chlorophyll meter and turf color meter showed potential in quantifying turfgrass color with greater consistency. However, the narrow separation obtained using turf color meter may not allow cultivar differentiation from species with less genetic color variation. Texture evaluation of turfgrasses was done after developing and implementing the run length encoding algorithm (RLE) on simulated turf built using twist ties in both planar and turf-type arrangements. Significant relationship was observed between manual measurements of twist ties and RLE-derived values. The algorithm implementation on true turfgrass images collected under greenhouse and field conditions from Kentucky bluegrass showed significantly positive relationship between RLE values and visual evaluation ratings. The possibility of collecting and analyzing images from multiple plots for color quantification was also evaluated successfully using an elevated platform from both Kentucky bluegrass and fairway bentgrass trials.

Name thesis:degree_name

Ph.D.

Level thesis:degree_level

Dissertation

Discipline thesis:degree_discipline

Natural Resrouces and Environmental Sciences

Grantor

University of Illinois at Urbana-Champaign

Year dc:date

2015

Author dc:creator

• Narra, Siddhartha

Contributors dc:contributor

• Fermanian, Thomas W.

• Environmental Sciences

Language dc:language

eng

Identifier

(MiAaPQ)AAI3290329

OAI identifier oai:identifier

oai:www.ideals.illinois.edu:2142/83121