Underwater imaging device and method by using laser point for scanning

Abstract

The invention discloses an underwater imaging device and method by using a laser point for scanning. The device comprises a light source, an imaging unit and a synchronous circuit; the light source isa laser point scanning light source, and the laser point scanning light source comprises a semiconductor laser module; the imaging unit is a camera or a vidicon of a CMOS image sensor with a rollingshutter exposure function; and the whole device is placed on the same side of a shot object. According to the underwater imaging device and method in the invention, the laser point is used for scanning the light source; compared with a linear light source or a strip-shaped light source, the structure is simpler, the size is smaller, and the energy utilization rate is higher. According to the device and the method in the invention, a plurality of semiconductor lasers can be used for synthesizing a beam of laser, so that the power of the light source can be improved, and the light source is enabled to contain multiple wavelengths; a better backward scattering eliminating effect or a better color correcting effect can be achieved by changing the wavelength of the light source under differentwater qualities. According to the underwater imaging device and method in the invention, the scanning speed is higher, the power consumption is lower, the stability is higher, and the size is smaller.

Description

technical field [0001] The invention relates to the technical field of imaging equipment, and in particular to an underwater imaging device and method for illuminating by point scanning of a laser light source. Background technique [0002] Due to the characteristics of water molecules and the presence of a large number of impurities in natural water bodies, the clarity of underwater images is greatly affected by scattered light. Due to the absorption of water molecules and impurities, light attenuates quickly in water. In order to obtain digital images with appropriate brightness, underwater imaging systems often include lighting sources. However, since the light source and imaging unit are usually designed on the same side of the underwater target, the observation of the target is strongly affected by the backscattering of the water body, and the obtained image will be partially overexposed and the scene underexposed, so it is difficult to Obtain clear images of underwate...

AI Technical Summary

Problems solved by technology

However, this invention requires that the distance between the imaging unit and the light source be greater than 1 / 2 of the farthest imaging distance, which is difficult to achieve on most underwater robots, and once the installation position is determined, it can only image objects within a fixed distance range

In addition, compared with the laser point light source, the structure of the linear or strip light source used in this invention is more complicated, which is not conducive to practical application

Third, the scanning method using the light source array in turn in this invention has the problems of complex structure and large volume, and it is difficult to improve the scanning accuracy

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