In the process of raising seedlings in the domestic market, there are many problems, such as poor facili-ties, occupying more land resources, and no scientific method of environmental regulation, a kind of environment control system for seedling growing box was designed, and a method for simultaneous determination of stem diameter of multi-seedling was proposed by image processing technique. Firstly, the growth information of seedlings was ob-tained, the median filter method was used to preprocess the image, and the target area was extracted based on the Ot-su automatic threshold segmentation method, through the"stacked wood" way to achieve seedling stem segmentation extraction. Stem diameter D and stem diameter variation ΔD were the input of fuzzy inference system, the output of the fuzzy inference system was the temperature setting value. Temperature was controlled by PID method to achieve the control of the temperature inside the nursery box. The experimental results showed that the system can adjust the temperature of the seedlings in real time according to the growth of the seedlings, reflect the scientific planting pat-tern and enhance the economic benefit, and promote the cultivation of high quality seedlings.%针对目前国内育苗过程中存在的设施简陋,占用土地资源多,没有科学的环境调控方法等问题,设计了一种育苗箱环境控制系统,提出了利用图像处理技术对穴盘多株幼苗的茎直径进行同时测定的方法.首先,获取幼苗的长势信息,采用中值滤波方法对图像进行预处理,基于Otsu自动阈值分割法来提取目标区域,通过"叠积木"的方式实现幼苗茎部分割提取.设计以茎直径D和茎直径变化量ΔD为输入的模糊推理系统,模糊推理系统的输出作为温度设定值;温度控制采用PID方法,实现育苗箱内温度的控制.试验结果表明,该系统能够实时地根据幼苗茎的生长情况进行相应的温度调控,提升经济效益,运用科学的种植模式培育优质种苗.
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