Fisheye lens for underwater monitoring, imaging device and image correction method and system

Abstract

The invention discloses a fisheye lens for underwater monitoring, an imaging device and an image correction method and system, the fisheye lens can collect optical signals in a range of 380nm to 1600nm, an optical intensifier amplifies insufficient underwater luminous flux, and finally, the correction method of an image processing system is applied to optimize an image. The fisheye lens integrates the advantages of high peripheral brightness ratio, over 180-degree wide angle, high imaging quality, high resolution, complete confocal infrared and visible light, capability of working in a low-illumination environment and the like, and the distortion is in a micron dimension. The optical intensifier is composed of a uniquely-designed array type compound paraboloid condenser, the size of the optical intensifier is in the micron dimension, the influence on imaging is very small, and weak light can be amplified by four times. And the image processing system is internally provided with an image correction algorithm to optimize the acquired image. The device not only can be applied to underwater monitoring, but also can be applied to low-illumination environments such as night, rain, snow, fog and the like to realize monitoring and camera shooting.

Description

technical field [0001] The invention relates to the technical field of underwater imaging, and in particular, to a fisheye lens, an imaging device, and an image correction method and system for underwater monitoring. Background technique [0002] A fisheye lens is an ultra-wide-angle lens with a focal length of 16mm or less. The front lens of this type of lens is large in diameter and protrudes to the front of the lens in a parabolic shape, which is quite similar to the eyes of fish, so it is commonly known as "fisheye lens". Fisheye lens is a special type of all optical lens categories. It belongs to bionic lens and is generally used for shooting and projection in 120° to 180° or even larger field of view environments. The imaging principle is "non-similar imaging", that is, by introducing Quantify "distortion", resulting in a large inverse-to-far ratio, increasing the field of view of the lens. In the 1970s, the fisheye lens first appeared in the film industry, used to s...

AI Technical Summary

Problems solved by technology

[0008] At the same time, due to the suspension of small particles such as sediment and micro organisms in the water, the underwater environment is turbid and the light has a serious scattering effect.

[0009] On the whole, there are still many deficiencies in the existing general fisheye lens, such as the size of the target surface is mostly about 1 / 2.8 inches, the application environment is very limited, and the imaging frame is small; the light is generally not high, and the low-light effect is not good. ;Generally, the f-theta distortion is relatively large, the pixels occupied by the same unit angle, the edge is less than the center, etc., and the imaging device that can be applied underwater is relatively small compared to the device used in the air, and the exploration of the ocean is also It is imminent, so the inherent imaging device can no longer meet the increasing requirements, it is necessary to improve it

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