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A method for measuring leaf area index

A technology of leaf area index and measurement method, which is applied in the direction of measuring device, image data processing, image enhancement, etc., can solve the problems of misjudgment of sky leaf pixels, unsatisfactory binarization effect, and influence on the accuracy of final leaf area index, etc. , to achieve the effect of accurate leaf area index

Active Publication Date: 2020-03-24
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology

In the existing algorithm, when the canopy image is binarized, the binarization threshold is an empirical value, and there are large subjective factors, which may misjudge the sky leaf pixels, and the binarization effect is not ideal, which affects the final leaf area. Index Accuracy

Method used

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  • A method for measuring leaf area index
  • A method for measuring leaf area index
  • A method for measuring leaf area index

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Embodiment

[0024] figure 1 It is a flow chart of the specific implementation of the method for measuring the leaf area index of the present invention. Such as figure 1 Shown, the concrete steps of leaf area index measuring method of the present invention comprise:

[0025] S101: Canopy image shooting:

[0026] Canopy images were captured by a fisheye camera. When shooting, avoid direct sunlight entering the lens.

[0027] In this embodiment, the fisheye camera adopts the OV2640 camera, which is a 1 / 4 inch CMOS UXGA (1632*1232) image sensor produced by OmniVision, which can provide all functions of a single-chip UXGA camera and image processor. Controlled by the SCCB bus, it can output 8 / 10-bit image data with various resolutions such as full frame, sub-sampling, scaling and windowing. Among them, UXGA has a maximum frame rate of 15 frames per second.

[0028] S102: Extracting the imaging area:

[0029] Extract the image within the 57.5-degree ring as the imaging area, divide the a...

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Abstract

The invention discloses a method for measuring the leaf area index. The canopy image is obtained by taking a fisheye camera, and the image within the 57.5-degree circle is extracted as the imaging area, and the blue component value of each pixel in the imaging area is used to compare the imaging area. The image is grayscaled to obtain a grayscale image of the imaging area, and the optimal binarization threshold is determined according to the histogram of the grayscale image of the imaging area, and the grayscale image of the imaging area is binarized to obtain a binary image of the imaging area and denoised. The leaf area index was calculated from the denoised binarized image of the imaging area. The invention finds the optimal binarization threshold based on the histogram, can more accurately divide the sky background and leaves, and makes the obtained leaf area index more accurate.

Description

technical field [0001] The invention belongs to the technical field of leaf area index measurement, and more specifically relates to a method for measuring leaf area index. Background technique [0002] Vegetation is an important component of terrestrial ecosystems, and leaves are an important organ for the interaction between vegetation and the outside world. As an important characteristic parameter of crop population structure, leaf area index can quantitatively describe the photosynthesis, respiration, and transpiration of vegetation. It is widely used in the fields of environment, climate, ecology, agriculture, etc. It is defined as half of the leaf area of ​​the vegetation canopy per unit surface area. [0003] For the measurement method of leaf area index, it can be divided into direct measurement and indirect measurement. The direct measurement method is to directly measure the surface area of ​​the blade, and the reliability of the measurement results can be guarant...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06T5/00G06T5/40G06T7/136G06T7/62G01B11/28
Inventor 陈云坪钟传琦童玲梁家铭黄佳杨玥
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA