h a l f b a k e r y"Bun is such a sad word, is it not?" -- Watt, "Waiting for Godot"
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indoor maps for the blind has the following features:
Location of human information point
Entrance and exit - and emergency route
Specifically important locations that blind people need.
Warnings about obstacles.
Voice interface for both input and output.
Orient yourself
- by having a look around
Human volunteers can help you out
Human volunteers can help save you in case of an emergency.
Tikkun Olam Makers
http://tomglobal.org
[JesusHChrist, Jun 25 2017]
estimote beacons
http://estimote.com/
[pashute, Jun 26 2017]
SubPos Positioning System
https://hackaday.io...-positioning-system
For [I T] [notexactly, Jun 27 2017]
SubPos Ranger
https://hackaday.io.../9242-subpos-ranger
For [I T] [notexactly, Jun 27 2017]
Laser velocimeter
https://www.google....JLwpvMyKovADEzHq6dA
Now, I don't propose that anyone should walk around with this on their head, but this shows the astonishing accuracy available. [Ling, Jun 28 2017]
[link]
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The Israeli standards for public buildings now has the
regulation to use a BT beacon at the information and
entrance point. So, at least, that's a good "starting point". |
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Google Tango could be a good platform to develop this
on. |
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I think the problem with accelerometers is that you need
to integrate twice to get distance. Any small offset error is
summated continuously. |
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But if you can go up one level, it gets a little more
accurate.
Laser speed measurement can be done perpendicularly
to the object. It's quite common to shine a laser spot on a
moving strip, from the side, and combine the reflection
with a sample of the output to get pulse measurement of
velocity. Quite accurate, too. |
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One could gymbol such a laser spot vertically to the
ceiling and directly measure velocity of a pedestrian in a
room. Then integrate only once to get distance. Not
perfect, but getting better.... |
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// You see, most solutions to this problem involve
some external positioning of more than one device to
define the area within which detection occurs. There
isn't a really good way of doing it from the device in
question alone. Most solutions I've seen resort to
things like the Kinect sensor or pairs of IR or visual
sensors on stands, etc. Therefore you have to have
predefined the allowed area and range and you can't
walk outside that. // |
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Indeed. Perhaps a lidar+SLAM or visual odometry
solution would be better for your purposes. |
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Also, [Ling], I have to look into that laser velocimeter
technology some more. How does it measure
transverse velocity? |
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As I understand, they combine the reflection with the
original source and look at the interference. |
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It was a surprise to me to find out that the perpendicular
movement also changes the reflection frequency, but the
instrument test engineer gave me this answer during a
witness test that I did, once, for a steel rolling company. |
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Surely what we're missing here is the need to restore these people's sight? |
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