[opendtv] Human Field of View; was Re: Re: Fwd: Expo 2005 (Sony GLV)
- From: cbenham@xxxxxxxxxxx
- To: opendtv@xxxxxxxxxxxxx, <opendtv@xxxxxxxxxxxxx>
- Date: Thu, 14 Jul 2005 17:19:43 +0000
From "A Virtual Retinal Display For Augmenting Ambient Visual Environments
by Michael Tidwell
http://www.hitl.washington.edu/publications/tidwell/ch3.html
3.2 Field of View
The field of vision of a single static human eye is approximately 140 [deg.]
from the nasal to the temporal limits of vision [8]. The vertical field of
vision is approximately 90 [deg.]. The highest resolution of the visual system
occurs over a region only 2-4 [deg.] in extent. This region, called the fovea
(also called the "focal" visual system), contains mostly cone receptors which
are responsible for discerning detail and color in daylight vision. The
remaining receptor area (sometimes called the "ambient" visual system) contains
mostly rod receptors and detects motion and other spatial information. The rods
cover a region from a few degrees off the axis of the eye to 70 [deg.] away
from the axis. One might mistakenly assume that a display could be designed so
that the center portion of the display is "high" resolution and so that the
periphery is "lower" resolution. However, resolution in the peripheral field of
view is necessary for accurate detection of motion [8] and t
o control of saccadic eye movement. Some manufacturers offer displays with
higher resolution inset areas and lower resolution backgrounds. The high
resolution inset moves according to eye position. The registration of an inset
with actual eye position can be difficult and the lower resolution periphery
degrades the viewer's motion and visual search ability. The ideal display,
however, allows for the fact that the eye rotates about its axis, or gimbals,
as a person looks around a scene. In fact, the ideal display matches the
resolution of the eye over the entire field of vision (i.e. one minute of arc
resolution over a 140 [deg.] horizontal monocular field as shown previously).
<snip>
A summary of system requirements for the ideal augmented vision display would
be as follows (Table III.1):
Table III.1. Performance characteristics for an ideal augmented vision display.
Performance Characteristic
Value
Horizontal Monocular Field of View 140 [deg.]
Vertical Monocular Field of View 90 [deg.]
Horizontal Binocular Field of View 180 [deg.]
Vertical Binocular Field of View 90 [deg.]
Binocular Stereo Overlap 120 [deg.]
Angular Resolution 1 [arc min.]
Horizontal Pixel Elements (Monocular) 8400
Vertical Pixel Elements (Monocular) 5400
Estimated Retinal Illuminance 0 - 105 [trolands]
Color:
Red = 650 [nm]
Green = 530 [nm]
Blue = 460 [nm]
Augmentation Variable from 0-100%
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