Development of a Remote Control System for Orchid Diseases Monitoring Using Image Processing Technique for Precision Application of Chemicals in Standard Greenhouses

บทคัดย่อ

The orchids disease monitoring system with crop image processing technique developed could measure and evaluate the plant disease infestation in order to prevent a decrease in yield as well. Image data wereprocessed by a program coding in MATLAB program. The chemical injection systems were controlled related to the density of the plant disease detected. The acquired low altitude remote sensing images were positioned and processed to estimate vegetative-indices with MATLAB program (Red=650 nm and NIR=800 nm band center) and thereby detecting diseases in orchids plants. Then good correlations and clear cluster range were obtained in characteristic plots of NDVI and GNDVI against chlorophyll content, the chlorophyll content values (mol m-2) according to statistical analysis showed significant differences among clusters for healthy orchids (R2=0.985-0.992), for infested orchid (R2=0.984-0.998), respectively. The camera Web CAM model which is lower price, the accuracy in image processing, take the best at an altitude of 1.2 meters, and Digital camera which is medium price, take the best at an altitude of 1-1.2 meters. The NIR camera which is higher price, take the best at an altitude of 1.6 meters or more. The image processing software based on LARS images created provided satisfactory results comparing with a manual measurement.