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相关概念视频

Light Acquisition02:16

Light Acquisition

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In order to produce glucose, plants need to capture sufficient light energy. Many modern plants have evolved leaves specialized for light acquisition. Leaves can be only millimeters in width or tens of meters wide, depending on the environment. Due to competition for sunlight, evolution has driven the evolution of increasingly larger leaves and taller plants, to avoid shading by their neighbors with contaminant elaboration of root architecture and mechanisms to transport water and nutrients.
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Crop cultivation has a long history in human civilization, with records showing the cultivation of cereal plants beginning at around 8000 BC. This early plant breeding was developed primarily to provide a steady supply of food.
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Area Computation by the Alternative Coordinate Method01:24

Area Computation by the Alternative Coordinate Method

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The alternative coordinate method, also known as the Shoelace Formula, is a technique for determining the area of a traverse using Cartesian coordinates. This method relies on the sequential arrangement of x and y coordinates for each point of the shape, ensuring accuracy and ease of application.In this approach, each corner's x and y coordinates are listed as fractions, with the x-coordinate as the numerator and the y-coordinate as the denominator. These coordinates are arranged sequentially...
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When the population standard deviation is unknown and the sample size is large, the sample standard deviation s is commonly used as a point estimate of σ. However, it can sometimes under or overestimate the population standard deviation. To overcome this drawback, confidence intervals are determined to estimate population parameters and eliminate any calculation bias accurately. However, this only applies to random samples from normally distributed populations. Knowing the sample mean and...
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This lesson introduces two critical methods in pharmacokinetics, the Wagner-Nelson and Loo-Riegelman methods, used for estimating the absorption rate constant (ka) for drugs administered via non-intravenous routes. The Wagner-Nelson method relates ka to the plasma concentration derived from the slope of a semilog percent unabsorbed time plot. However, it is limited to drugs with one-compartment kinetics and can be impacted by factors like gastrointestinal motility or enzymatic degradation.
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Metal ions can be separated from one another by complexation with organic ligands–the chelating agent– to form uncharged chelates. Here, the chelating agent must contain hydrophobic groups and behave as a weak acid, losing a proton to bind with the metal. Since most organic ligands used in this process are insoluble or undergo oxidation in the aqueous phase, the chelating agent is initially added to the organic phase and extracted into the aqueous phase. The metal-ligand complex is...
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相关实验视频

Updated: Sep 14, 2025

Leaf Area Index Estimation Using Three Distinct Methods in Pure Deciduous Stands
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Leaf Area Index Estimation Using Three Distinct Methods in Pure Deciduous Stands

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使用基于改进的YOLOv11-AreaNet的轻量级实例细分框架对小种子西兰花的叶面积估计.

Yaben Zhang1, Yifan Li1, Xiaowei Cao1

  • 1College of Engineering, Nanjing Agricultural University, Nanjing, China.

Frontiers in plant science
|July 21, 2025
PubMed
概括

一个新的轻量级模型,YOLOv11-AreaNet,准确地测量西兰花叶面积,用于早期作物表型. 这种高效的系统使农业实时监测和高通量选成为可能.

关键词:
青菜的苗木 青菜的苗木改进了YOLOv11的功能叶面积细分 叶面积细分轻量级的模型轻量级的模型.植物特征量化植物特征量化智能农业 智能农业

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相关实验视频

Last Updated: Sep 14, 2025

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科学领域:

  • 农业科学 农业科学
  • 计算机视觉 计算机视觉
  • 植物表型化 植物表型化

背景情况:

  • 准确的叶面积测量对于像西兰花这样的小种作物的早期表型化至关重要.
  • 由于茂密,重叠和不规则的树叶,传统方法效率低下.

研究的目的:

  • 开发一种轻量级实例细分模型,用于精确估计西兰花苗中的叶面积.
  • 为实时应用优化空间灵敏度,多尺度融合和计算效率.

主要方法:

  • 使用了YOLOv11-AreaNet与EfficientNetV2骨干,焦点调制,C2PSA-iRMB注意力,LDConv和CCFM模块.
  • 从定制的表型系统中训练了5000张增强图像.
  • 应用后处理,包括形态优化,边缘增强和流域细分.

主要成果:

  • YOLOv11-AreaNet实现了与YOLOv11相似的细分精度,参数减少了57.4%,操作减少了25.9%.
  • 模型尺寸减少了51.7%,使得边缘设备的部署成为可能.
  • 高相关性 (R2 = 0.983) 与手动测量证实精度;相对叶面积增长率达到26.6%.

结论:

  • YOLOv11-AreaNet提供了一个强大的,可扩展的解决方案,用于在小种作物中自动测量叶面积.
  • 该系统支持高通量选和智能作物监测.
  • 允许在农业应用的边缘设备上实时部署.