Method for obtaining leaf area index and average leaf inclination of rice canopy by using hemisphere photographic process

A technology of leaf area index and leaf inclination angle, which is applied in image data processing, instrumentation, calculation, etc., can solve the problems of difficulty in obtaining results quickly and accurately in real time, time-consuming and labor-intensive problems, etc.

Active Publication Date: 2010-12-15
ZHEJIANG UNIV
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  • Abstract
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Problems solved by technology

[0007] In order to overcome the shortcomings of the existing methods of manually measuring rice canopy LAI and ALIA in the field, which are time-consuming and laborious, and difficult to obtain result...

Method used

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  • Method for obtaining leaf area index and average leaf inclination of rice canopy by using hemisphere photographic process
  • Method for obtaining leaf area index and average leaf inclination of rice canopy by using hemisphere photographic process
  • Method for obtaining leaf area index and average leaf inclination of rice canopy by using hemisphere photographic process

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Embodiment Construction

[0019] In the selected fields, 8 shooting plots of 1m×1m were set up according to the "S" shape distribution, with an average of 36 rice plants in each plot. Choose early rice, late rice and single-cropping rice as the shooting objects. Shoot once a week during the growing season of each season of rice, and shoot 5-7 times per rice season.

[0020] 1) Take the image of the rice canopy hemisphere:

[0021] Place the fisheye camera at the center of each plot, keep it horizontal, and shoot upwards; choose cloudy or sunny days when the sun is blocked by clouds; rotate the camera horizontally, take a picture every 45°, every A total of 8 hemispherical images of the rice canopy were obtained for each plot; the average value of the porosity obtained by processing these 8 images was used as the basic data for inversion of canopy structure parameters.

[0022] 2) Color image grayscale conversion:

[0023] The conversion formula uses:

[0024] Gray (x, y) = B (x, y) (1)

[0025] In...

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Abstract

The invention discloses a method for obtaining the leaf area index and the average leaf inclination of rice canopy by using a hemisphere photographic process. The method comprises the following steps of: collecting a hemisphere image of rice canopy from bottom to top inside the rice canopy by using a digital hemisphere shooting system based on a fisheye lens; after performing gray conversion and binaryzation on the hemisphere image, obtaining the canopy porosity under the zenith angle at a viewing angle of 57 degrees, and calculating the rice canopies LAI and ALIA under the condition of the single zenith angle at the viewing angle of 57 degrees based on the Beer-Lambert law and a poisson model as well as the two characteristics of the blade projection function of the rice canopy; simulating the leaf inclination distribution of the rice canopy by an elliptic function and optimizing the rice canopies LAI and ALIA calculated by using the single-angle method so as to rapidly acquire the rice canopies LAI and ALIA. The rice canopies LAI and ALIA can be obtained in real time without picking up rice blade outdoors for destructive artificial measurement, and basic parameters for monitoring the rice growth in real time and remotely estimating the yield of rice are provided.

Description

technical field [0001] The invention relates to a method for obtaining rice canopy leaf area index and average leaf inclination angle by hemispherical photography. Background technique [0002] Rice is one of the most important food crops in my country. The rice canopy is the main place where rice interacts with the external environment. Many biophysical processes of rice, including photosynthesis, respiration, transpiration, and precipitation interception, take place in the canopy. Canopy structure parameters are important indicators to reflect the growth status of rice and estimate rice yield. Among many canopy structure parameters, the leaf area index (LAI) reflects the area of ​​plant leaves per unit surface; the average leaf inclination angle (ALIA) expresses the spatial distribution of leaves in the canopy. Together with other canopy structure parameters, these two parameters determine the ability of rice to utilize and manage light, water, etc. [0003] The traditi...

Claims

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Application Information

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IPC IPC(8): G06T7/00
Inventor 周炼清史舟潘桂颖
Owner ZHEJIANG UNIV
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