Measurement Method of Virtual Field of View in Augmented Reality Optical Systems

Fig. 5. Photographed images of the maximum displayed virtual images by the AR lens sample. (a) VID measurement is 1070 mm; (b) VID measurement is 1360 mm; (c) VID measurement is 1530 mm

Download full size

Fig. 6. Float range of the measurement result in VFOV due to different VID measurements when each parameter is taken as a threshold. (a) Y_max; (b) Y_min; (c) Y_mean; (d) Y_avg; (e) Y_med; (f) Y_rms

Download full size

Fig. 7. Effective field of view extracted when using 64% of average pixel luminance value as the luminance threshold. (a) VID measurement is 1070 mm; (b) VID measurement is 1360 mm; (c) VID measurement is 1530 mm

Download full size

Table 1. Parameters of the devices used in the VFOV measurement system

View table

Table 1. Parameters of the devices used in the VFOV measurement system

Parameter	Value
Image source	DLP5530PGUQ1EVM
Size of CMOS /（ $''$ ）	$1 / 2$
Resolution of CMOS	2048 $\times$ 1536
Exposure time /ms	50
Focal length of lens /mm	6
FOV of lens /［（°） $\times$ （°）］	$41.6 \times 53.8$
f-number	1.4
Distortion of lens /%	<0.1

Table 2. Brightness thresholds tested and their range of values

View table

Table 2. Brightness thresholds tested and their range of values

Brightness thresholds Y_TH	Range of values
$Y_{T H} = Y_{m a x} \times k$	$k = 50 - i, i = 0,1, \dots, 30$
$Y_{T H} = Y_{m i n} \times 0.1 k$	$k = 50 - i, i = 0,1, \dots, 30$
$Y_{T H} = Y_{m e a n} \times k$	$k = 120 - 2 i, i = 0,1, \dots, 30$
$Y_{T H} = Y_{a v g} \times k$	$k = 120 - 2 i, i = 0,1, \dots, 30$
$Y_{T H} = Y_{m e d} \times k$	$k = 120 - 2 i, i = 0,1, \dots, 30$
$Y_{T H} = Y_{r m s} \times k$	$k = 100 - 2 i, i = 0,1, \dots, 30$

Table 3. Average results of VFOV measurement with each parameter at different magnifications as thresholds

View table

Table 3. Average results of VFOV measurement with each parameter at different magnifications as thresholds

Parameter as threshold	Vertical VFOV result /（°）	Horizontal VFOV result /（°）
Y_max	24.023±1.298	43.484±1.856
Y_min	27.072±4.070	45.365±1.353
Y_mean	28.063±4.102	46.005±0.889
Y_avg	22.380±1.164	40.677±2.102
Y_med	33.058±3.679	47.504±1.098
Y_rms	22.133±1.695	40.475±2.639

Table 4. Float range of the virtual image field of view measurements in different values of the virtual image distance measurements

View table

Table 4. Float range of the virtual image field of view measurements in different values of the virtual image distance measurements

Float range of the measurement result of VFOV	Vertical VFOV result /（°）	Horizontal VFOV result /（°）
maximum	28.053±2.630	47.615±1.685
average	25.793±0.473	43.574±0.549
minimum	23.613±0.228	42.936±0.360

Tools

Get Citation

Copy Citation Text

Fangxu Tian, Jun Zhang. Measurement Method of Virtual Field of View in Augmented Reality Optical Systems[J]. Laser & Optoelectronics Progress, 2022, 59(20): 2011019

Download Citation

EndNote(RIS)BibTex Plain Text

Set citation alerts for article

Save article for my favorites

Paper Information

Category: Imaging Systems

Received: Mar. 8, 2022

Accepted: May. 24, 2022

Published Online: Oct. 11, 2022

The Author Email: Zhang Jun (Tzhangjun_oe@jnu.edu.cn)

DOI:10.3788/LOP202259.2011019

Topics

laser devices and laser physics

Lasers and Laser Optics

Laser physics

laser manufacturing

Instrumentation, Measurement and Metrology