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Method for calculating projected area of three-dimensional plant

A technology of projected area and calculation method, applied in the field of agricultural information, can solve the problems of inaccurate calculation results, large amount of calculation cycle, long calculation time, etc., and achieve the effect of improving calculation accuracy, reducing calculation error, and improving accuracy

Active Publication Date: 2018-06-15
SHANGHAI ACAD OF AGRI SCI
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  • Abstract
  • Description
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Problems solved by technology

However, there are still two shortcomings in the above calculation method. One is that the phenomenon of light leakage is ignored, which makes the calculation results inaccurate; the other is that the calculation amount is large and the calculation time is long

Method used

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  • Method for calculating projected area of three-dimensional plant
  • Method for calculating projected area of three-dimensional plant
  • Method for calculating projected area of three-dimensional plant

Examples

Experimental program
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Effect test

Embodiment

[0038] Example 1 Calculate the projected area of ​​a 3D model of a cucumber and visualize the results

[0039] Including the following steps:

[0040] S1. Three-dimensional grid preprocessing, reasonable subdivision of plant leaves:

[0041] S11: Find the three-dimensional minimum leaf length: cyclically compare each leaf on the three-dimensional plant, find the leaf with the smallest leaf length, and record the minimum leaf length as LeafLength min ;

[0042] S12: Calculate the maximum grid edge length EdgeLength max : Let EdgeLength max = Leaf Lengthmin / 5.0;

[0043] S13: Mesh subdivision: check each grid element of the 3D plant, if a certain grid element has an edge length greater than EdgeLength max , the grid edge is subdivided, that is, the grid surface element is divided into two grids with smaller side lengths; the same process is performed on the subdivided grid surface element, and finally the grid of the entire 3D plant is In, there is no edge length greater ...

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Abstract

The invention provides a method for calculating the projected area of a three-dimensional plant. The method includes the following steps: (1) carrying out three-dimensional grid preprocessing to subdivide plant leaves; (2), generating a projection grid and rejecting an overlapped grid accurately by using the gravity point as a projection overlapping determination basis; and (3), calculating a projection area. With the method provided by the invention, while the grid overlapping rejection calculation workload is reduced, the accuracy of the projected area calculation is improved obviously.

Description

technical field [0001] The invention relates to the technical field of agricultural information, in particular to a method for calculating the projected area of ​​a three-dimensional plant. Background technique [0002] In applications such as agricultural breeding, cultivation, and garden design, it is often necessary to calculate the projected area of ​​a plant. The projected area is an important parameter reflecting the leaf opening angle and the light-receiving area, and it is also a morphological parameter directly related to the yield. Accurately calculating the projected area of ​​plants has important guiding significance in the fields of agricultural production management and landscaping. Due to the various shapes of leaves and stems of plants, the projection on the ground is usually extremely irregular, and affected by the tilt angle of the organs, the calculation accuracy of the projected area is not high, and the calculation speed is slow. This makes accurate an...

Claims

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Application Information

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IPC IPC(8): G06T7/62G06T19/20
CPCG06T19/20G06T2207/10012G06T2207/30188G06T7/62
Inventor 钱婷婷陆声链冯静岩
Owner SHANGHAI ACAD OF AGRI SCI
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