Chlorophyll fluorescence and imaging technology based plant disease detection method and detection device

Abstract

The invention discloses a chlorophyll fluorescence and imaging technology based plant disease detection method and a detection device. The detection device is arranged in an illumination box, a blue LED (light emitting diode) lamp is used as an excitation light source, an equilaterally triangular structure is formed, can achieve stable and uniform illumination and is used for exciting chlorophyll fluorescence of plant leaves, and a colored high-speed camera and a front red optical filter with adjustable lens are adopted for filtering interference light and collecting a chlorophyll fluorescence image; the leaves and the background are separated and a sub-image of a pixel region taking the main leaf vein as the center position is obtained through the steps of image pretreatment, image division and characteristic extraction, the vein characteristics and the leaf vein characteristic parameters of the leaves are calculated, and finally, the plants are divided into healthy plants and disease plants through computation by a classifier; the method and the device can be used for exciting the chlorophyll fluorescence of the plant leaves, acquiring the chlorophyll fluorescence image of the plant leaves, calculating the vein characteristics and the leaf vein characteristic parameters and detecting the plant diseases.

Description

technical field [0001] The invention relates to a method and device for detecting plant diseases, in particular to a method and device for detecting plant diseases based on chlorophyll fluorescence and imaging technology. Background technique [0002] The substances that can excite fluorescence in plants are mainly polyphenols and photosynthetic pigments, including carotenoids and chlorophyll. Under the excitation of one or more bands of excitation light, fluorescence spectra in different bands can be obtained. [0003] The development of excitation light source is from xenon lamp, halogen lamp to ultraviolet lamp and laser. In recent years, LED has become a new type of light source due to its advantages of low energy consumption and long life. Moreover, LEDs will not cause burn damage to plants. At present, there are growth boxes for preventing plant diseases based on LED light sources (patent application publication number: CN102014608A). [0004] Plants have the strong...

AI Technical Summary

Problems solved by technology

The current invention of detection devices for plant health status is mainly aimed at analyzing the content of plant nutrient elements, thereby judging whether the plants are healthy, and lacks a detection device for distinguishing healthy plants from diseased plants threatened by viruses and germs

Moreover, most of the existing devices for disease detection use visible light imaging or multispectral imaging technology, and there are few detection methods that combine chlorophyll fluorescence and imaging technology.

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