Half a croissant, on a plate, with a sign in front of it saying '50c'
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indoor maps for the blind

on top of google indoor maps, set it "for blind user" and shazam
  [vote for,

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.

pashute, Jun 25 2017

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]


       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".
pashute, Jun 26 2017

       Google Tango could be a good platform to develop this on.
notexactly, Jun 27 2017

       what's not to like?
po, Jun 28 2017

       I think the problem with accelerometers is that you need to integrate twice to get distance. Any small offset error is summated continuously.   

       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.   

       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....
Ling, Jun 28 2017

       // 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. //   

       Indeed. Perhaps a lidar+SLAM or visual odometry solution would be better for your purposes.   

       Also, [Ling], I have to look into that laser velocimeter technology some more. How does it measure transverse velocity?
notexactly, Jun 29 2017

       As I understand, they combine the reflection with the original source and look at the interference.   

       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.
Ling, Jun 30 2017

       Surely what we're missing here is the need to restore these people's sight?
MaxwellBuchanan, Jun 30 2017


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