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Automated framework for accurate segmentation of leaf images for plant health assessment

  • Mohammed GhazalEmail author
  • Ali Mahmoud
  • Ahmed Shalaby
  • Ayman El-Baz
Article

Abstract

Leaf segmentation is significantly important in assisting ecologists to automatically detect symptoms of disease and other stressors affecting trees. This paper employs state-of-the-art techniques in image processing to introduce an accurate framework for segmenting leaves and diseased leaf spots from images. The proposed framework integrates an appearance model that visually represents the current input image with the color prior information generated from RGB color images that were formerly saved in our database. Our framework consists of four main steps: (1) Enhancing the accuracy of the segmentation at minimum time by making use of contrast changes to automatically identify the region of interest (ROI) of the entire leaf, where the pixel-wise intensity relations are described by an electric field energy model. (2) Modeling the visual appearance of the input image using a linear combination of discrete Gaussians (LCDG) to predict the marginal probability distributions of the grayscale ROI main three classes. (3) Calculating the pixel-wise probabilities of these three classes for the color ROI based on the color prior information of database images that are segmented manually, where the current and prior pixel-wise probabilities are used to find the initial labels. (4) Refining the labels with the generalized Gauss-Markov random field model (GGMRF), which maintains the continuity. The proposed segmentation approach was applied to the leaves of mangrove trees in Abu Dhabi in the United Arab Emirates. Experimental validation showed high accuracy, with a Dice similarity coefficient 90% for distinguishing leaf spot from healthy leaf area.

Keywords

Image processing Segmentation LCDG Plant health Leaf area Mangrove Environmental monitoring Non-destructive 

Notes

Funding information

This work is funded by the Office of Research and Sponsored Programs of Abu Dhabi University under grant number 19300068.

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Copyright information

© Springer Nature Switzerland AG 2019

Authors and Affiliations

  1. 1.Electrical and Computer Engineering DepartmentAbu Dhabi UniversityAbu DhabiUnited Arab Emirates
  2. 2.Bioengineering DepartmentUniversity of LouisvilleLouisvilleUSA

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