Multi-mode optical imaging water quality remote sensing detection device and pollution feature extraction method

Abstract

The invention discloses a multi-mode optical imaging water quality remote sensing detection device and a pollution characteristic extraction method. The device comprises a light source formed by combining a white light source and a fluorescence excitation light source, and an image acquisition device formed by combining an imaging camera and a filter wheel, a narrow-band optical filter is switchedby adopting the filter wheel, spectral imaging signals with different wavelengths are obtained, and a multi-mode optical imaging mode combining an absorption spectrum and a fluorescence spectrum is realized; images obtained by all the imaging cameras are programmed into digital signals and transmitted to a data collecting and processing system to be processed, and pollutant characteristics are extracted. The method comprises the following steps: registering measured absorption spectrum and fluorescence spectrum images by adopting an affine edge energy conversion method to realize consistencyof an image measurement range and resolution; counting the fused image features one by one; and classifying the fused image features by using a support vector machine by taking the gray mean value, the variance, the energy of the gray co-occurrence matrix and the correlation as feature vectors so as to realize extraction of different pollution features in a wide water area.

Description

technical field [0001] The invention relates to the field of online monitoring of water quality, in particular to a multi-mode optical imaging water quality remote sensing detection device and a pollution feature extraction method. Background technique [0002] Water resources are an indispensable part of the earth's ecosystem and a part of the survival of human civilization. Based on China's national conditions, my country's total fresh water resources rank fourth in the world, but my country's per capita water resources are only 1 / 4 of the world's average level, making it one of the countries with the poorest per capita water resources in the world. In the case of insufficient water per capita in China, the water consumption for people's life, agriculture, and artificial ecology is still very large. Our country is facing the problem of serious shortage of water resources, and the pollution of water resources is also very serious. According to the "2018 China Water Resour...

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Problems solved by technology

This method has obvious defects: the detection speed is slow, there is secondary pollution, the cost is high, and real-time online detection cannot be realized

[0006]The main problem facing the current water quality monitoring devices and methods based on spectroscopy is that sampling is required, and it is difficult to realize remote sensing detection in a relatively wide water area; the measurement mode is often only for absorption signal or fluorescence signal, it is impossible to obtain multiple optical signals at the same time for comprehensive analysis; due to the complexity of water pollution components, different components interfere with each other during measurement, and the recognition accuracy of pollution features in remote sensing imaging is poor

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