Illuminator, imaging system and imaging system control method

Abstract

The invention provides an illuminator, an imaging system and an imaging system control method, and the illuminator comprises a light source, a lens, a structural member, and one or more diaphragms. The lens is used for converging light rays emitted by the light source; the lens and the diaphragm are arranged along the light emitting direction of the light source; the structural member is provided with an accommodating cavity for accommodating the light source, the lens and the diaphragm; and a light-transmitting window is arranged at the end part of the accommodating cavity in the light emitting direction. Through the lens and the diaphragm in the illuminator in the scheme, the light emission angle of the light source in the illuminator is limited, so that a layered illumination light layer can be generated, the interference of a fuzzy background on a clear foreground in a subsequent imaging process is reduced, and the proportion of an out-of-focus fuzzy image in a generated image is reduced.

Description

technical field [0001] The invention relates to the field of illuminating devices, in particular to an illuminator, an imaging system and a control method for the imaging system. Background technique [0002] Underwater tiny organisms and particulates are important components of the water environment. The study of these tiny organisms and particulates has important scientific significance and application value for water environment science, microbiology, marine science, ecology and other disciplines. The underwater optical microscopy and macro imaging method can obtain non-contact and fast high-quality particle images, and then achieve more accurate measurement, identification and statistics. It is an important means to obtain and study underwater microbiological and particle information. [0003] Currently there are some systems or methods for underwater imaging and lighting, for example, patent WO2016 / 048851 describes a continuous particle imaging and classification system...

AI Technical Summary

Problems solved by technology

However, the layered illumination formed by this technical solution has limited ability to compress the thickness of the optical layer, and the high-magnification imaging depth of field is thinner. Therefore, the optical layer produced by this method is difficult to match the depth of field of the high-magnification imaging system, and there is still a problem of defocus blur

In addition, the illuminator does not consider the dynamic adjustment of light intensity, which leads to insufficient dynamic range of the imaging system, and the imaging is prone to overexposure and insufficient signal-to-noise ratio, which affects the imaging performance

[0005] It can be seen that there are three main technical problems that need to be solved urgently in the existing underwater in-situ optical microscopy and macro imaging technology: 1) Due to the limited depth of field of the imaging system, the target is out of focus and blurred, which in turn leads to the detection and measurement of the target. 2) Due to the unnatural distribution of the target caused by the illumination light, the abundance measurement is inaccurate; 3) Due to the insufficient dynamic range of the imaging system, the target image is overexposed or the signal-to-noise ratio is insufficient, which leads to Machine Vision System Measurement Accuracy Declines

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