Method for identifying pear rust disease spots on leaf of pear tree

An identification method and leaf technology, applied in the direction of color/spectral characteristic measurement, etc., can solve problems such as external interference, achieve high accuracy, timely and effective prevention and control, and simple operation

Inactive Publication Date: 2014-01-01
上海镆石机电科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The invention provides a method for identifying pear rust spots on pear tree leaves to solve the problem that the traditional method is easily disturbed by external interference through naked eye observation

Method used

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  • Method for identifying pear rust disease spots on leaf of pear tree
  • Method for identifying pear rust disease spots on leaf of pear tree
  • Method for identifying pear rust disease spots on leaf of pear tree

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Embodiment Construction

[0039] Randomly select a pear tree leaf, scan the leaf with a full band of 450-900nm (manufacturer: Specim, Finland, model: near-infrared spectral imager imspector V10E) Select three points on the region and the normal leaf region to obtain their spectral curves, such as figure 2 As shown, the slopes of the spectral curves between 565nm and 623nm between rust spots and lesion spots except rust spots, and normal leaves are significantly different.

[0040] Using the above-mentioned full-band scanning results, select multiple points in the lesion area and normal leaf area to obtain their first-order derivative spectral curves, and select a differential window scale of 50nm, such as image 3 As shown, the difference between the first-order derivative spectral values ​​of lesion and normal leaves at 550nm, 575nm and 655nm is the most obvious, so the first-order derivative spectral images of pear tree leaves at these three wavelengths can be used as characteristic values.

[0041...

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Abstract

The invention discloses a method for identifying pear rust disease spots on a leaf of a pear tree. The method for identifying the pear rust disease spots on the leaf of the pear tree comprises the following steps that (1) the leaf of the pear tree is taken, and single-band images in the positions of 550nm, 565nm, 575nm, 623nm and 655nm of the leaf of the pear tree are collected; (2) first derivative transformation is carried out on the single-band images in the positions of 550nm, 575nm and 655nm of the leaf of the pear tree, and the three characteristic values are input into a trained gaussian process disaggregated model, and a disease spot image is extracted; (3) differential calculation is carried out on the single-band images in the positions of 565nm and 623nm of the leaf of the pear tree, binaryzation is carried out on the result images, and a rust spot image is extracted; (4) the disease spot image and the rust spot image are overlapped and combined, and if a single disease spot and a single rust spot are combined to form a new communicated area, the disease spot is a pear rust disease spot. The method for identifying the pear rust disease spots on the leaf of the pear tree is not only easy to operate, but also high in accuracy, and facilitates timely and effective prevention and control over the pear rust disease.

Description

technical field [0001] The invention relates to a method for identifying plant diseases, in particular to a method for identifying pear rust spots on leaves of pear trees. Background technique [0002] Pear rust, also known as red spot disease, mainly harms the leaves, new shoots and young fruits of plants. In addition to harming pear trees, pear rust can also harm hawthorn, Tang pear and crabapple. The pathogen of pear rust is pear gum rust fungus, which belongs to Basidiomycotina genus, and the sex spores are gourd-shaped and buried under the epidermis. The pear rust fungus has the characteristic of parasitic hosts, and must survive the winter on host trees such as juniper, cypress, and European juniper to complete its life cycle. If there are no hosts such as juniper and cypress within a radius of 5 kilometers around the pear orchard, pear rust generally cannot occur. In the presence of juniper, cypress and other trees, if the number of overwintering pathogens on the ho...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/25
Inventor 赵芸徐兴樊靖烨
Owner 上海镆石机电科技有限公司
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