Imaging system and imaging method using liquid crystal lens to realize partial zoom

Abstract

The embodiment of the invention discloses an imaging system and an imaging method using a liquid crystal lens to realize local zooming, and relates to the technical field of optical imaging. The imaging system includes: a main lens assembly, a first liquid crystal lens assembly, a second liquid crystal lens assembly, and an image sensor arranged in sequence, the first liquid crystal lens assembly includes a first compensation lens and a first liquid crystal lens, and the second liquid crystal lens assembly includes a first compensation lens and a first liquid crystal lens. The liquid crystal lens assembly includes a second compensation lens and a second liquid crystal lens. When imaging, the combination of the first compensation lens and the first liquid crystal lens has positive optical power, and the combination of the second compensation lens and the second liquid crystal lens has negative optical power. Spend. The present invention increases the optical power of the system without changing the difference between positive and negative optical powers by combining the first compensation lens with fixed optical power, the second compensation lens and the liquid crystal lens with variable optical power. The changing range of the focal power increases the utilization rate of the focal power of the lens, thereby increasing the zoom ratio.

Description

technical field [0001] The invention relates to the field of optical imaging technology, in particular to an imaging system and an imaging method that uses a liquid crystal lens to realize local zooming. Background technique [0002] At present, image zoom technology is very suitable for scene monitoring, defense alarm, target tracking and other fields. Implementation methods can be divided into hardware methods and software methods. For example commonly used optical zoom and scaling algorithms. [0003] When a liquid crystal lens is used for partial zooming, a first liquid crystal lens and a second liquid crystal lens are sequentially arranged between the main lens and the image sensor. Wherein, the first liquid crystal lens focuses on the region of interest in the scene, and the second liquid crystal lens zooms the image focused by the first liquid crystal lens. During imaging, the first liquid crystal lens is adjusted to be a positive power liquid crystal lens, and the...

AI Technical Summary

Problems solved by technology

However, this form of work does not take full advantage of the optical power of the liquid crystal lens

like figure 1 As shown, 10 is the main lens, when the first liquid crystal lens 11 and the second liquid crystal lens 12 are not working, the imaging is A'B', and when working, the imaging is A"B"; at this time, the first liquid crystal lens 11 is not used Negative power and positive power of the second liquid crystal lens 12

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