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Lookup NU author(s): Susanto Sulistyo,
Dr Wai Lok Woo,
Professor Satnam Dlay
This is the authors' accepted manuscript of an article that has been published in its final definitive form by IEEE, 2017.
For re-use rights please refer to the publisher's terms and conditions.
The estimation of nutrient content of plants is considerably important in agricultural practices especially in enabling the application of precision farming. A plethora of methods have been used to estimate nitrogen amount in plants, including the utilization of computer vision. However, most of the image-based nitrogen estimation methods are conducted in controlled environments. These methods are not so practical, time consuming and require many equipment. Therefore, there is a crucial need to develop a method to estimate nitrogen content of plants based on leaves images captured on field. It is a very challenging task since the intensity of sunlight is always changing and this leads to an inconsistent image capturing problem. In this research, we develop a low-cost, simple and accurate approach image-based nitrogen amount estimation. Plant images are captured directly under sunlight by using a conventional digital camera and are subject to a variation in lighting conditions. We propose a color constancy method using neural networks fusion and a genetic algorithm to normalize various plant images due to different sunlight intensities. A Macbeth color checker is utilized as the reference to normalize the color of the images. We also develop a combination of neural networks using a committee machine to estimate the nitrogen content in wheat leaves. Twelve statistical RGB color features are used as the input parameters for the nutrient estimation. The obtained result shows considerable better performance than the conventional gray-world and scale-by-max approaches, as well as linear model and single neural network methods. Finally, we show that our nutrient estimation approach is superior to the commonly-used SPAD (soil-plant analysis development) meter based prediction.
Author(s): Sulistyo SB, Woo WL, Dlay SS
Publication type: Article
Publication status: Published
Journal: IEEE Transactions on Industrial Informatics
Print publication date: 01/02/2017
Online publication date: 14/11/2016
Acceptance date: 08/05/2016
Date deposited: 09/02/2017
ISSN (print): 1551-3203
ISSN (electronic): 1941-0050
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