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Open AccessArticle

Chromaticity Measurement Based on the Image Method and Its Application in Water Quality Detection

1
College of Computer Science and Technology, Huaibei Normal University, Anhui 235000, China
2
College of Environmental Science and Engineering, Tongji University, Shanghai 200092, China
*
Author to whom correspondence should be addressed.
Water 2019, 11(11), 2339; https://doi.org/10.3390/w11112339
Received: 4 October 2019 / Revised: 30 October 2019 / Accepted: 5 November 2019 / Published: 8 November 2019
(This article belongs to the Special Issue Monitoring, Modelling and Management of Water Quality)
In order to measure the chromaticity of water and the content of dissolved matter more accurately, effectively, and cheaply, a chromaticity measurement system based on the image method was proposed and applied. The measurement system used the designed acquisition device and image processing software to obtain the Red-Green-Blue (RGB) values of the image and converted the color image from RGB color space to Hue-Saturation-Intensity (HSI) space to separate the chromaticity and brightness. According to the definition of chromaticity, the hue (H), saturation (S) values, and chromaticity of standard chromaticity solution images were fitted by a non-linear surface, and a three-dimensional chromaticity measurement model was established based on the H and S values of water images. For the measurement of a standard chromaticity solution, the proposed method has higher accuracy than spectrophotometry. For actual water sample measurements, there is no significant difference between the results of this method and the spectrophotometer method, which verified the validity of the method. In addition, the system was tried to measure the concentration of ammonia nitrogen, phosphate, and chloride in water with satisfactory results. View Full-Text
Keywords: water quality; analysis method; chromaticity measurement; surface fitting; concentration of dissolved matter water quality; analysis method; chromaticity measurement; surface fitting; concentration of dissolved matter
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MDPI and ACS Style

Cao, P.; Zhu, Y.; Zhao, W.; Liu, S.; Gao, H. Chromaticity Measurement Based on the Image Method and Its Application in Water Quality Detection. Water 2019, 11, 2339.

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