Design of compact optical system in wide-angle head mounted display

2012 ◽  
Vol 20 (5) ◽  
pp. 979-987 ◽  
Author(s):  
卢海平 LU Hai-ping ◽  
刘伟奇 LIU Wei-qi ◽  
康玉思 KANG Yu-si ◽  
魏忠伦 WEI Zhong-lun ◽  
冯睿 FENG Rui ◽  
...  
Keyword(s):  
Optical System ◽  
Wide Angle ◽  
Head Mounted Display

Fisheye Lens Distortion Calibration Based on the Lens Charactetic Curves

2014 ◽  
Vol 519-520 ◽  
pp. 636-639
Author(s):  
Bao Long Zhang ◽  
Shao Jing Zhang ◽  
Wei Qi Ding ◽  
Hui Shuang Shi
Keyword(s):  
Optical System ◽  
Characteristic Curve ◽  
Calibration Method ◽  
Lens Distortion ◽  
Wide Angle ◽  
Forming Process ◽  
Fisheye Lens ◽  
Large Scope ◽  
Wide Angle Lens ◽  
Barrel Distortion

The fisheye lens is a kind of ultra wide angle lens, which can produce a big super-wide-angle lens distortion. In order to cover a large scope of light, barrel distortion is artificially added to the optical system. However, in some cases this distortion is not allowed, then it requires calibrations of those distortions. Most of the traditional distortion calibration method uses target plane calibration to do it. This paper discusses the way of design fisheye lens, through which we can know the forming process of distortion clearly. Based on this paper, a simple and effective calibration method can be understood. Different from common camera calibration method, the proposed calibration method can avoid the error occurring in the process of calibrating test, that directly use the lens’ characteristic curve. Through multiple sets of experimental verifications, this method is effective and feasible.

Wide-angle zoom polarization imaging optical system design for physical evidence search

2019 ◽  
Vol 48 (4) ◽  
pp. 418006
Author(s):  
尹 骁 Yin Xiao ◽  
李英超 Li Yingchao ◽  
史浩东 Shi Haodong ◽  
江 伦 Jiang Lun ◽  
王 超 Wang Chao ◽  
...  
Keyword(s):  
System Design ◽  
Optical System ◽  
Wide Angle ◽  
Optical System Design ◽  
Polarization Imaging ◽  
Physical Evidence

A Wide-Angle, Linear-Output Horizon Sensor Optical System

1964 ◽  
Vol 3 (1) ◽  
pp. 63 ◽  
Author(s):  
William E. Palser
Keyword(s):  
Optical System ◽  
Wide Angle

scholarly journals Design of Wide Angle and Large Aperture Optical System with Inner Focus for Compact System Camera Applications

2019 ◽  
Vol 10 (1) ◽  
pp. 179 ◽  
Author(s):  
Hojong Choi ◽  
Jaemyung Ryu
Keyword(s):  
Optical System ◽  
High Speed ◽  
Resolving Power ◽  
Wide Angle ◽  
Phase Detection ◽  
Half Angle ◽  
Stepper Motors ◽  
Angle Of View ◽  
Floating Type ◽  
Focusing Lens

Conventionally, a bright, very wide-angle optical system is designed as a floating type optical system that moves two or more lens groups composed of multiple lens in order to focus accurately. These have been widely used as phase detection auto focus (AF) methods within conventional digital single-lens reflex (DSLR) cameras. However, a phase detection AF optical system cannot be used when recording motion pictures. In contrast, a compact system camera (CSC) performs AF by the contrast method, where a stepper motor is used as the driving source for moving the optical lens. Nonetheless, to ensure that the focusing lens is lighter, these stepper motors should not have high torque and AF must be possible by moving only one lens. Yet, when focusing is performed with only one lens, aberration change due to focusing lens movement is magnified. Therefore, a very wide-angle optical system comprised of a half-angle of view more than 40 degrees and F of 1/4 has not been developed. Here, a very wide-angle optical system was designed with high resolving power that enables high speed AF, even in contrast mode, by moving only one lens while minimizing aberration change.

Optical system of a miniature wide-angle solar sensor

2020 ◽  
Vol 87 (6) ◽  
pp. 371
Author(s):  
M. P. Kolosov ◽  
A. Ya. Gebgart ◽  
D. Yu. Lobanov ◽  
S. Yu. Zenzinov ◽  
G. L. Tsymbal
Keyword(s):  
Optical System ◽  
Wide Angle

scholarly journals Focus-Adjustable Head Mounted Display with Off-Axis System

2020 ◽  
Vol 10 (21) ◽  
pp. 7931
Author(s):  
So Hyun Seo ◽  
Jae Myung Ryu ◽  
Hojong Choi
Keyword(s):  
Optical System ◽  
Optical Axis ◽  
Focal Length ◽  
Normal Vector ◽  
Effective Focal Length ◽  
Head Mounted Display ◽  
Conventional Methods ◽  
Angle Of Reflection

An off-axis system refers to an optical system in which the optical axis and the normal vector at the vertex of each surface do not match. An off-axis optical system can be applied in order to construct a thin and light optical system. In particular, the optical system used for a see-through head-mounted display (HMD) must be designed asymmetrically, with respect to the optical axis. Because the vision of a human is different for each individual, HMD requires focus adjustment. The effective focal length (EFL) of the optical system must be calculated to obtain the focus adjustment. However, the off-axis optical system cannot be calculated by conventional methods. In this study, the EFL was calculated by rotating the coordinates of the rays near the optical axis by the angle of reflection or refraction at the intersection of each surface, with the rays coinciding with the optical axis. The magnitude of movement of the micro-display for focus adjustment was obtained from the calculated EFL, for a see-through type HMD.

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