tagin-devel team mailing list archive

[Ravi Agarwal <raviagarwal.iiith@xxxxxxxxx>]

For the navigation problem-
The localization and object annotation information from our app can be fed
as input into a plan recognition module. Once the resultant goal is
identified based on user location and preference, it is translated into a
pre-defined objective to the path planner which computes the resultant path
and communicates the navigational information to the user (See the attached
flowchart).


On Wed, Apr 20, 2011 at 11:52 PM, yibin <wapprentice@xxxxxxxxx> wrote:

> For the idea of room finder application, one thing to notice is that some
> APs actually have energy preservation feature (and I think it will become
> more and more popular) which allows AP dynamically adjust RSSI by load. Some
> more sophisticated machine learning technique is needed to counter this time
> variant fingerprint value. The room finder is the kind of application
> requires most accuracy and needs not just positioning but also direction
> guidance (which maybe could be done using gradient descend of RSSI of the
> landmark APs ?).
>
> Bests,
> Yibin
>
>
> On 2011/4/18 13:54, Jorge Silva wrote:
>
>> Hola Ravi,
>>
>>  See my answers below...
>>
>> cheers!
>> Jorge
>>
>> On 11-04-15 02:14 PM, Ravi Agarwal wrote:
>>
>>> Dear Dr.Jorge,
>>>
>>> I talked to my friend Venkatesh here about the project and the final
>>> goal we are trying to achieve. He is visually impaired and uses
>>> assistive technologies for operating computer etc. I got a wonderful
>>> feedback from him. He is excited to use the technology and thinks that
>>> it will be very useful. He also said that if this was implemented
>>> universally, like it can be made compulsory for some buildings to have a
>>> Wifi network and tagged fingerprints stored so that one could easily
>>> navigate room to room.
>>>
>> Great! we are indeed trying out different approaches to making sure this
>> becomes widely available... I think the best approaches will be those that
>> offer value to people with blindness and others alike, so sustainable
>> for-profit models may be developed. Regulatory measures also help, but
>> ultimately, market approaches have the strongest impact (me thinks).
>>
>>  He asked me some interesting questions which I
>>> hadn't thought of myself-
>>> 1)What happens if two rooms are opposite to each other. Will the
>>> fingerprint be different?
>>>
>> Yes, it should be... we are completing some benchmarking tests to
>> characterize how this works.
>>
>>  2)The application is good as a location finder but if you want to
>>> navigate in a building then fingerprint will only be different after a
>>> certain range...what will be that range?...
>>>
>> fingerprint patterns change a lot when there are lots of barriers (like
>> walls, floors/ceilings), thus the range tends to include full-rooms
>> (whatever their size).
>>
>>  also the map of the building
>>> should already be known by the application. If the rooms are numbered in
>>> an ordered fashion then it could easily be assessed in which way one
>>> should move to reach the destination once you know the proximity but
>>> what is rooms are not ordered.
>>>
>> Yes, mapping has to be done before hand. We'll be working on developing
>> tools that facilitate this process as part of getting a building ready for
>> indoor positioning.
>>
>>  One more guy suggested another application of this technology. Suppose
>>> you have a house with multiple rooms. Now if a telephone call comes then
>>> you don't want all the phones to ring...through wifi fingerprinting it
>>> can be sensed that in which room you are and only that phone can be made
>>> to ring.
>>>
>> This is a really cool application... useful to me since I don't want the
>> phone in the baby's room to ring when he is asleep. We should get a wiki
>> application ideas page started. Would you mind doing that?
>>
>>  I know that all these will be applications once we are through with the
>>> project it seemed very interesting to me so I thought I will share it
>>> with you.
>>>
>> great, thanks!
>>
>>  -Ravi Agarwal
>>>
>>>
>>>
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>>
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>
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