This is true, we have worked extensively to try to find an ideal compromise
but none is totally satisfactory. If you make the HMD small enough in fov to
be comfortable from the orbital muscle use point of view i.e less than 26
degree, it is not satisfactory as a computer display for windows or word
processing or drawings. as one feels the desire to "move closer". If you
make the display larger FOV it is as I said unbearable after a few minutes
if it is a high res display at say 30 or 35 degree FOV.
Ideally the HMD would have perfect OC reflex compensation and would appear
as a real monitor in a superficially fixed world. I designed such a system
but it requires considerable research and refinement to be realized
practically.
We examined the possibility of a compensated resolution display in that the
cetre was high res and the peripheral low res and this shows promise as an
entertainment display in that the film director can to some extent be
relied on to maintian imprtant regions of interest inside the critical plus
minus 12 degree field. This display form feels a little odd at first but
surprisingly comfortable after a while. The initial "oddness" however is
likely to be a major sales depressor.
In the end the only way that has any hope of being a useable high res
display is a perfectly compensated OCR system i.e. the display appears to be
stationary in real space. The problem then is to find a way to cue
recentering for a mobile persons display that does not just dump you back
into the same problem loop.
Scott
-----Original Message-----
From: Bryn Wolfe <[log in to unmask]>
To: [log in to unmask] <[log in to unmask]>
Date: 12 July 2000 12:17
Subject: Re: does anyone know this number?
>
>
>John Strachan wrote:
>
>> Greater than 7 degrees is rare without head movement greater than 12
degrees
>> is considered the typical limit. References are from the HMD handbook.
>>
>> A head mounted display with a field of view greater than 26 degrees is
>> virtually useless as a computer data display as it is unbearably
>> uncomfortable to use.
>
>Yes, but let's not forget that the "data" part of a display is only that
part
>which needs to be foveated. Peripheral vision is a significant part of
cueing
>foveation. With properly coordinated head motion and display update, a
wider
>field of view is desireable. In that respect, no adequate HMD exists
>commercially.
>
>Bryn
>
>>
>>
>> Scott.
>> -----Original Message-----
>> From: David Wooding <[log in to unmask]>
>> To: [log in to unmask] <[log in to unmask]>
>> Date: 11 July 2000 18:16
>> Subject: FW: does anyone know this number?
>>
>> >
>> >-----Original Message-----
>> >From: Ruth Conroy [SMTP:[log in to unmask]]
>> >Sent: 11 July 2000 17:09
>> >To: [log in to unmask]
>> >Subject: does anyone know this number?
>> >
>> >I remember reading somewhere, that during natural vision (i.e. without
head
>> >restraint) humans rarely move their eyeballs more than x degrees within
>> >their sockets (sorry, I realise I'm probably not using the correct terms
>> >here). After this amount, we are more likely to move our whole head, in
>> >order to look at something. I can not find the original reference to
this
>> >number - I seem to recall it was between 5 and 8 degrees. If anyone can
>> >assist, by telling me what this figure should be, I would be very
grateful
>> >
>> >Thank you
>> >
>> >Ruth Conroy
>> >
>> >+-----------------------+
>> >| Ruth A Conroy |
>> >| [log in to unmask] |
>> >| |
>> >| tel. +44 20 7419 4255 |
>> >| fax. +44 20 7419 4233 |
>> >| mobile 07939 119 832 |
>> >+-----------------------+
>> >
>> >
>> >
>
>--
>Name : Bryn Wolfe
>Title : Robotics Engineer
>Dept : Texas Robotics & Automation Center (TRACLabs)
>Company: Metrica, Inc
>
>Voice : 281-461-7886
>FAX : 281-461-9550
>Web : http://www.traclabs.com
>Email : mailto:[log in to unmask]
>Smail : 1012 Hercules Drive
> Houston, TX 77058-2722
>
>
>
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
|