Method of acquiring leaf area index (LAI) of rice canopy by using common digital camera

A leaf area index and digital camera technology, applied in the direction of using optical devices, measuring devices, instruments, etc., can solve the problems of rice canopy LAI that is time-consuming and difficult to obtain quickly and accurately in real time

Active Publication Date: 2012-01-25
ZHEJIANG UNIV
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Problems solved by technology

[0006] In order to overcome the shortcomings of the existing manual field measurement of rice canopy LAI, which is time-consuming and laborious, and difficult to obtain results quickly and accurately in real time, the purpose of the present invention is to provide a method for obtaining rice canopy leaf area index using ordinary digital cameras, which is based on ordinary A method of taking rice canopy images with a digital camera at a zenith angle of 57 degrees and extracting porosity to invert rice leaf area index

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  • Method of acquiring leaf area index (LAI) of rice canopy by using common digital camera
  • Method of acquiring leaf area index (LAI) of rice canopy by using common digital camera
  • Method of acquiring leaf area index (LAI) of rice canopy by using common digital camera

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Embodiment Construction

[0023] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0024] 1) Camera shooting angle setting

[0025] Such as figure 1 As shown, firstly, the three legs of the tripod 1 with the level indicating bubble are opened and properly adjusted so that the level indicating bubble indicates that the top of the tripod is in a horizontal state. Fix the camera body 5 on the head 2, and then fix the head with the camera on the top of the tripod axis 7. Initialize an inclinometer with a digital display on a level ground to make its reading zero, and then attach it to the LCD screen at the rear of the camera; loosen the tilt fixing screw of the pan / tilt 2, and the front of the camera lens 6 faces Next, adjust the inclination angle of the gimbal along the vertical direction of the main optical axis 3 of the camera lens, so that the reading of the inclination measuring instrument is 32.5°, that is, the angle between the L...

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Abstract

The invention discloses a method of acquiring LAIs of a rice canopy by using a common digital camera. According to the method, a common digital camera is employed to shoot a picture of a rice canopy above the rice canopy with primary optic axis of the lens of the camera and a vertical plane of the rice canopy forming an angle of 57.5 degrees; gray scale conversion, binaryzation and noise cancellation are carried out on the obtained picture of the rice canopy, and porosity of the rice canopy at a visual angle and zenith angle of 57.5 degrees is directly extracted from the processed picture; LAIs of the rice canopy are directly calculated based on the relationship between the LAI of the rice canopy and porosity of the rice canopy at a visual angle and zenith angle of 57.5 degrees. The advantages of the invention are as follows expensive imported special-purpose equipment is not employed; field plucking of rice leaves for destructive manual measurement is avoided; real time and rapid acquisition of LAIs of the rice canopy is realized, thereby providing fundamental parameters for real time monitoring of growth vigor of rice and for rice yield estimation through remote sensing.

Description

technical field [0001] The invention relates to a method for obtaining the rice canopy leaf area index, in particular to a method for obtaining the rice canopy leaf area index by using an ordinary digital camera. Background technique [0002] Rice is one of the most important food crops in my country. Rice leaves are the main place where rice interacts with the external environment. Many biophysical processes in rice, including photosynthesis, respiration, transpiration, and precipitation interception, take place in leaves. Leaf area index (LAI) reflects the total area of ​​plant leaves per unit surface. It determines the ability of rice to utilize and manage radiation, water, etc. Therefore, LAI is an important index to reflect the growth status of rice and estimate the rice yield. [0003] The traditional method of obtaining rice LAI is mainly "direct measurement method". Leaf area index was converted from the total leaf area. In addition, Warren Wilson (Warren Wilson...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B11/28
Inventor 周炼清史舟潘桂颖
Owner ZHEJIANG UNIV
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