Design and experiment of energy-saving lighting system for plant factory based on OpenCV

doi:10.3969/j.issn.1004-1524.2022.03.23

Acta Agriculturae Zhejiangensis ›› 2022, Vol. 34 ›› Issue (3): 626-635.DOI: 10.3969/j.issn.1004-1524.2022.03.23

• Biosystems Engineening • Previous Articles Next Articles

Design and experiment of energy-saving lighting system for plant factory based on OpenCV

LIN Xiaoteng(), SUN Qian, ZHENG Shuhe()

College of Mechanical and Electrical Engineering, Fujian Agriculture and Forestry University, Fuzhou 350100, China

Received:2021-04-15 Online:2022-03-25 Published:2022-03-30
Contact: ZHENG Shuhe

Abstract

Abstract:

In order to solve the problem of high energy consumption of light system in the plant factory, the energy-saving lighting system was designed based on OpenCV vision library. In the proposed system, the light source was optically redesigned to make the divergent LED light into a circular spot. Thus, it could provide sufficient light for plants with a smaller power, and reduce energy consumption in the areas without plant. The mechanical structure and control system were also designed. The image recognition algorithm was designed to identify dynamic change of the spot size with the growth of plant based on the OpenCV vision library of Raspberry Pi, which could improve the automation of this system. A test on the effect of the proposed system was carried out with butter lettuce as the plant material, and the ordinary lighting system as the control. The results showed that the energy consumption of the proposed system was reduced by 55.8%, and its power utilization efficiency was increased by 72.7%. In general, the proposed system had energy-saving effect and realized higher power utilization efficiency.

Key words: lighting system, image recognition, energy-saving

CLC Number:

S626
TP391.4

LIN Xiaoteng, SUN Qian, ZHENG Shuhe. Design and experiment of energy-saving lighting system for plant factory based on OpenCV[J]. Acta Agriculturae Zhejiangensis, 2022, 34(3): 626-635.

Figures/Tables 13

Fig.1 Light device structure 1, LED source; 2, Linear bearing; 3, Slider of ball screw; 4, Lens plate; 5, Convex lens; 6, Retractable condenser; 7, Roof.

Fig.2 Photos of actual working scene of energy-saving lighting system

Fig.3 Overall structure of control system LCD, Liquid crystal display; PPFD, Photosynthetic photon flux density; DC, Direct current.

Fig.4 Flow chart of image preprocessing

Fig.5 Demonstration of gray scaled image

Fig.6 Demonstration of images before (left) and after (right) Gamma correction

Fig.7 Image histogram before (a) and after (b) Gamma correction

Fig.8 Demonstration of the smallest circumscribed circle and rectangle image before (left) and after (right) removing errors

Fig.9 Demonstration of original image (left) and processed image (right) when plant does not fit spot image

Fig.10 Demonstration of original image (left) and processed image (right) when adjacent spots overlap

Fig.11 Process of clustering analysis

Fig.12 Flow chart of judgment of relationship between spot and plant in group

Table 1 Power consumption of light system under different treatments kW·h

处理 Treatment	第1~6天 Day 1 to 6	第7~12天 Day 7 to 12	第13~18天 Day13 to 18	合计 Total
试验组Test group	1.372	1.884	2.715	5.971
对照组Control group	3.315	4.127	6.081	13.523

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Design and experiment of energy-saving lighting system for plant factory based on OpenCV

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