Compact and fast depth sensor based on a liquid lens using chromatic aberration to improve accuracy

色差 光学 景深 镜头(地质) 光学设计 焦点深度(构造) 光学(聚焦) 焦距 实测深度 消色差透镜 计算机科学 色阶 软件 物理 构造学 生物 俯冲 古生物学 地球物理学 程序设计语言
作者
Gyu Suk Jung,Yong Hyub Won
出处
期刊:Optics Express [Optica Publishing Group]
卷期号:29 (10): 15786-15786 被引量:6
标识
DOI:10.1364/oe.425191
摘要

Depth from defocus (DFD) obtains depth information using two defocused images, making it possible to obtain a depth map with high resolution equal to that of the RGB image. However, it is difficult to change the focus mechanically in real-time applications, and the depth range is narrow because it is inversely proportional to the depth accuracy. This paper presents a compact DFD system based on a liquid lens that uses chromatic aberration for real-time application and depth accuracy improvement. The electrical focus changing of a liquid lens greatly shortens the image-capturing time, making it suitable for real-time applications as well as helping with compact lens design. Depth accuracy can be improved by dividing the depth range into three channels using chromatic aberration. This work demonstrated the improvement of depth accuracy through theory and simulation and verified it through DFD system design and depth measurement experiments of real 3D objects. Our depth measurement system showed a root mean square error (RMSE) of 0.7 mm to 4.98 mm compared to 2.275 mm to 12.3 mm in the conventional method, for the depth measurement range of 30 cm to 70 cm. Only three lenses are required in the total optical system. The response time of changing focus by the liquid lens is 10 ms, so two defocused images for DFD can be acquired within a single frame period of real-time operations. Lens design and image processing were conducted using Zemax and MATLAB, respectively.
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