IEEE Instrumentation & Measurement - September 2023 - 22

Device
RETISSA
Display II
Epson moverio
BT-35
Vision
Technology
Retinal
Table 1 - State of the art AR glasses and their key features
Lenses
Sensors/
Actuators
scanning
projection
Waveguide
Si-OLED
NuEyes pro 3
Birdbath
OLED
Nreal Light
Birdbath
OLED
Acesight
Birdbath
OLED
Monocular
26° FoV
720 dp
Binocular
23° FoV
1280 × 720
HD
Binocular
52° FoV
4K
Binocular
52° FoV
Full HD
Binocular
45° FoV
HD
no
5 Mp cam
IMU-6 axis
Light
sensor
13 Mp cam
IMU-6 axis
Light
sensor
2 × 5 Mp cam
IMU-9 axis
Light
sensor
8 Mp cam
Processor
External
(hdmi + audio
jack)
Snapdragon XR1
2.52 GHz Octa
Core
External
external
64 GB UFS
flash
4GB
RAM
external
260 g
$2150/2000€
Memory Weight
Price
183 g
$2165/1210€
130 g
$6456/5995€
External
external
106 g
$620/576€
Tethered unit
N/A
360 g
$5380/4995€
Table 2 - SeeFar smart glasses core components
Category
Main technical
specification
Scene and Depth Camera
Gaze Tracking System (GTS)
Intel RealSense D435
Pupil Labs' Hololens
gaze tracking add-on
Augmented Reality (AR) lenses Lingxi AR lenses AW60
Processing Unit
OS
Snapdragon open-Q
845 uSOM
Battery
Battery Operation Time
Weight
Wireless Communication
Android 9.0/Linux
Lithium-Ion battery
4 hours
250 g
Wi-Fi, Bluetooth/BLE
◗ Personalized visual assistant service to enhance user
view through image magnification and filtering
◗ Personalized visual recommendation service based on AI
algorithms
The main characteristics of each component of See Far
smart glasses, along with the functionalities that each one enables,
are presented in the following sections.
Scene and Depth Camera
This sensor provides stereoscopic view, managed by integrating
a high definition RGB camera and a depth (IR)
camera. For this purpose, the Intel® RealSense™ D435 has
been selected. The RGB camera has a 1920 × 1080 resolution
and a 30 fps frame rate, while the depth camera resolution is
22
1280 × 720, and its frame rate can reach 90 fps. The recorded
images can then be magnified and/or filtered for enhancing
the user's vision. Object detection and color identification
can also be performed, as well as identification of close hazards
such as obstacles and indoor navigation using the depth
camera [6],[7].
Gaze Tracking Cameras
Gaze tracking systems combine multiple cameras and dedicated
software for detecting pupil movement. They can collect
useful information such as the way the user perceives stimuli
from the environment, such as the points on which he/she focuses
while working, while browsing a document or even a
supermarket shelf, and the way he/she reacts to them. The See
Far solution can estimate the user's emotional arousal and provide
recommendations based on the user's emotional status,
helping him/her remain calm during work and avoid stressful
situations. Additionally, knowledge of where the person is
looking enhances the person's reading ability by zooming and
targeting specific areas of the text.
The chosen device, called Pupil Core, consists of two eye
cameras placed at specific distances from the eyes. Gaze and
pupil size data that are automatically estimated by the device
at 243 Hz are then post-processed and used for the extraction
of eye and gaze-related features utilized for the development
of machine learning models for the estimation of emotional
arousal and cognitive workload levels.
Augmented Reality Lenses
AR lenses are used in smart glasses' augmented reality applications
for projecting objects to the person wearing them while
remaining transparent so that the person can also see through
IEEE Instrumentation & Measurement Magazine
September 2023
IEEE Instrumentation & Measurement - September 2023

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