A Method of Extracting Leaf Area Index and Average Leaf Incline Angle Using Vegetation Canopy Shade

A technology of leaf area index and vegetation canopy, applied in the direction of using optical devices, measuring devices, instruments, etc., to reduce complexity, improve ease of use, and reduce experimental costs
CN104296696BActive Publication Date: 2017-01-25BEIJING NORMAL UNIVERSITY
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
BEIJING NORMAL UNIVERSITY
Publication Date
2017-01-25

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Abstract

Provided is a method for extracting leaf area index and mean foliage inclination angle by utilizing plant canopy shadow. The method is formed by two parts: canopy shadow automatic extraction technology and a canopy projection analysis method. The canopy shadow automatic extraction technology is characterized by automatically extracting shadow-in-picture proportion, which is called shadow proportion, from a plant canopy picture, and the part is specifically realized through eight steps. The canopy projection analysis method is characterized by obtaining the canopy leaf area index and the mean foliage inclination angle by utilizing the output results of the canopy shadow automatic extraction technology, that is, shadow proportions, extracted from the pictures at different time which is corresponding to a plurality of sun incidence height angles respectively, as input parameters, and the part is specifically realized through five steps. The method can realize automatic acquisition of structure parameters of plant canopy leaf area index and the mean foliage inclination angle and the like by utilizing the plant canopy shadow information extracted from common digital pictures; and the method has the advantages of simple classification method and high automation degree in the canopy analysis process.
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Description

technical field

[0001] The invention relates to a method for extracting leaf area index and average leaf inclination angle by utilizing vegetation canopy shadow, which is related to digital image processing and vegetation canopy analysis, and belongs to the technical field of agriculture and ecology. Background technique

[0002] Vegetation leaf area index (Leaf Area Index: LAI) and average leaf inclination angle (θ L ) belong to the structural information of vegetation, and they are important factors affecting the redistribution of solar radiation in the canopy. Therefore, obtaining LAI and θ L It is of great significance to study the ability of vegetation to utilize solar incident energy and the growth and development status of vegetation.

[0003] Extracting LAI and θ from digital images L It is a commonly used canopy analysis measurement method. According to the field of view of the imaging lens used by the measuring instrument, it can be subdivided into conventional...

Claims

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