Development of Image-Processing Software for Simple and High-Precision Measurement of Cover-Area Ratio on Water-Sensitive Paper

Kubota Yosuke, Usui Yoshihiko, Hayashi Kazunobu, Mizukami Tomomichi, Miyahara Sumihiko, Osato Dai, Nakano Kazuhiro

doi:10.3173/air.19.16

Pesticides are widely used for the cultivation of agricultural products in Japan. However, there is a risk that sprayed pesticides will drift toward nontarget crops, a phenomenon known as drift hazard. In the present study, a simplified method for both measuring and evaluating spray drift was developed using an image-processing system. Experimental pesticide spraying was conducted using a boom sprayer, a large fan, water-sensitive paper, a diluted solution of Sumithion (MEP) emulsion, stimulant crops, and glass plates. The diluted MEP emulsion was sprayed following the placement of the water-sensitive paper, stimulant crops, and glass plates at arbitrary measurement points, from which each material was then collected. Images of the collected water-sensitive paper were scanned and saved as red-green-blue (RGB) image data. Subsequently, the cover-area ratio was calculated from the RGB image data by using the following methods: decomposition of RGB components, extraction processing, binary conversion based on the brightness threshold, and arithmetic processing of pesticide stains. When only R-image data were used, the cover-area ratio was calculated with a high degree of accuracy, while the measurement time of the image-processing algorithm was greatly reduced. This image-processing algorithm provides a simple, objective, and repeatable means of measuring and evaluating spray drift by using water-sensitive paper.<br>

Development of Image-Processing Software for Simple and High-Precision Measurement of Cover-Area Ratio on Water-Sensitive Paper

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