Infrared image pick-up-based water body turbidity measurement device, image acquisition system and method

Abstract

The invention belongs to the technical field of water body turbidity measurement and discloses an infrared image pick-up-based water body turbidity measurement device, an infrared image pick-up-based water body turbidity measurement image acquisition system and an infrared image pick-up-based water body turbidity measurement method. According to the infrared image pick-up-based water body turbidity measurement method, an infrared camera is used to acquire the images of transmitted light and scattered light which are generated after light passes through a turbidity solution, the RGB data of the images are obtained through image processing, and the RGB data are transformed from an RGB space to a Lab color space; the Lab values of the images are obtained; and the relations of a series of turbidities and the values of R, G, B, L, a and b corresponding to the turbidities are fitted under scattering, transmission and ratio modes, so that a relational expression of turbidity values and corresponding color components can be obtained and can be applied to the turbidity measurement of an actual water sample. Compared with a commercial ordinary turbidity meter, the method disclosed by the invention has higher accuracy in the measurement of a standard solution; the result of the method is consistent with the result of the turbidity meter in the measurement of a specific water sample; the feasibility of the method is verified; and the method can accurately measure water body turbidities ranging from 0 to 1000 NTU.

Description

technical field [0001] The invention belongs to the technical field of water body turbidity measurement, and in particular relates to a water body turbidity measurement device, an image acquisition system and a method based on infrared photography. Background technique [0002] At present, the closest existing technology: a method for detecting water body turbidity based on a water body turbidity detection device based on an underwater observation network, using a computer to perform image enhancement processing on images captured by a color CCD camera, first performing median filter reduction noise to remove impulse noise, and then perform average noise reduction to remove random noise, and calculate the RGB value of the above-mentioned processed image; take the turbidity of the turbidity as the abscissa, and the difference between the B value and the G value of the image as the ordinate, according to The image fits the curve to obtain the relationship between the turbidity...

AI Technical Summary

Problems solved by technology

Moreover, the measurement is easily affected by color interference, resulting in different absorption of different light by water samples, resulting in large measurement errors.

[0015] (2) Prior Art 2 In the scattered light turbidity measurement method, when the turbidity of the liquid exceeds a certain limit (greater than 100NTU), multiple scattering phenomena will occur, causing the scattered light intensity to decline rapidly. At this time, the scattered light intensity It can no longer correctly reflect the turbidity value of the liquid sample, and the linear relationship between the scattered light intensity and the concentration of suspended particles is disturbed. Therefore, the scattered light turbidity measurement method is mainly used for low and medium turbidity liquids.

[0016] (3) In the prior art, the ratio of scattered light and transmitted light is not a strict linear relationship. This is due to the multiple scattering of light by particles in water, but it has an approximately linear relationship within a certain range of turbidity. Turbidity The measurement range thus has certain limitations

[0017] (4) The existing turbidity measurement methods are all based on the complex structure of photoelectric detection equipment, which can only be designed and produced by professional companies

However, the transmission-scattering ratio method only has an approximately linear relationship within a certain range, and the measurement range is bound to be affected.

Photoelectric detection can only measure light intensity, it is difficult to distinguish the color of the solution

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