Extraction of probability density distribution function of corn plant

doi:10.6046/gtzyyg.2020.01.11

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Abstract

Leaf angle is an important parameter to describe the canopy structure of vegetation. The leaf angle distribution (LAD) determines the interception of vegetation canopy and is an important parameter in quantitative inversion of remote sensing. The current method of measuring the leaf angle is time-consuming, labor-intensive and subjective, with no accuracy guarantee. In this paper, image-based probability density function extraction for LAD of corn plant is proposed, which can extract LAD of corn plant quickly and accurately with low cost. Firstly, the skeleton is extracted from the image. Secondly, the information such as burrs and stems in the skeleton image is removed to obtain the leaf skeleton. Finally, the leaf angle is extracted by searching the skeleton with a search window of size 2×20. The results of precision evaluation show that the correlation coefficient between the measured value of the corn dip angle and the extracted value is 0.821 4, and the correlation coefficient between measured and extracted values of the corn leaf angle at jointing stage is 0.908 7, which suggests that the method is feasible and accurate with low cost.

Keywords image corn plant leaf angle distribution function skeletonization deburring

:	TN959.3
	Q948.1

Corresponding Authors: Wei SU E-mail: suwei@cau.edu.cn

Issue Date: 14 March 2020

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	Xiao CHEN
	Dahong BIAN
	Yanhong CUI
	Xinli LIU
	Xianglei MENG
	Wei SU

Cite this article:

Xiao CHEN,Dahong BIAN,Yanhong CUI, et al. Extraction of probability density distribution function of corn plant[J]. Remote Sensing for Land & Resources, 2020, 32(1): 75-80.

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https://www.gtzyyg.com/EN/10.6046/gtzyyg.2020.01.11 OR https://www.gtzyyg.com/EN/Y2020/V32/I1/75

Fig.1 Image preprocessing results

Fig.2 Schematic plot of measuring the leaf inclination angles

Fig.3 Point p1 eight field schematic

Fig.4 Skeletonization process flow chart

Fig.5 Deburring flowchart

Fig.6 Schematic and result graph after pseudo node removal

Fig.7 Maize plant skeleton treatment results in milky maturityand jointing stage

Fig.8 Corn leaf skeleton before and after deburring treatment

Fig.9 Corn plant stem and ear removal results

Fig.10 Comparative analysis of LAD extraction and measured results of maize plants in milky maturity and jointing stage

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