[1]Department of Biosystems Machinery Engineering;
Chung-Nam National University;
Daejeon 305-764;
Republic of Korea;
[2]Department of Rural and Biosystems Engineering;
Chonnam National University;
Gwangju 500-757;
Republic of Korea;
[3]Department of Bio-Mechatronic Engineering;
Sungkyunkwan University;
Suwon;
Gyeonggi 440-746;
Republic of Korea;
[4]Sensoreye R&D Solutions;
Daejeon 302-861;
Republic of Korea;
[1]Department of Biosystems Machinery Engineering;
Chung-Nam National University;
Daejeon 305-764;
Republic of Korea;
imaging acquisition system; disease; downy mildew; onion;