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Sunlight Compensation for Vision Based Drone Detection
Yan Han Lau,Niven Sie Jun Liang,Shao Xuan Seah,Sutthiphong Srigrarom 제어로봇시스템학회 2021 제어로봇시스템학회 국제학술대회 논문집 Vol.2021 No.10
Computer vision based object detection can be applied in security and monitoring scenarios, such as detecting and tracking drone intrusions using cameras. However, its effectiveness is dependent on environmental conditions. For example, under bright sunlight and clear sky conditions, the sunlight reflecting off a target could cause it to blend into the sky and prevent detection. In this paper, an algorithm to compensation for the effects of sunlight on object detection was proposed. The algorithm applied a localised contrast increase to the sky through RGB-HSV conversion and image extraction techniques, which avoided the generation of false positives among the treeline. Preliminary tests with prerecorded videos showed that the algorithm improves detection under bright sunlight conditions but the contrast gain had to be manually tuned. Methods to dynamically tune the gain, and field tests to determine the algorithm’s real time effectiveness, are slated for future work.
Sue-Siang Teh,Brian E. Niven,Alaa El-Din A. Bekhit,Alan Carne,John Birch 한국식품과학회 2015 Food Science and Biotechnology Vol.24 No.5
Use of microwave and pulsed electric field (PEF) technologies for optimization of polyphenol extraction from defatted flax seed cake was attempted using a Box-Behnken response surface design. Polyphenols were extracted after microwave or PEF treatments using ultrasound under fixed variables of 200 W of ultrasonic power, a 70℃ water bath, and 20 min of extraction time. Measured responses were total phenolic and total flavonoid contents, and 2,2,-diphenyl-1-picrylhydrazyl radical (DPPH·) scavenging activity and ferric reducing/antioxidant power activities. Maximum yields of all responses were achieved under optimum conditions for microwave processing=5 min, a liquid to solid ratio=6, and at 644 W, and for PEF-assisted extraction for 30 V at 30 Hz with a 10% ethanol concentration, and a treatment time=10 s. Under optimized microwave or PEF processing conditions, yields of polyphenols from defatted seed cake were maximized.