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  1. #1
    Registered User
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    Nov 2008
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    Thumbs up Calculate distance between the phone and object

    Hi all
    Is it possible to calculate distance between the mobile and object in the viewfinder.
    I guess it should be possible by using auto focus feature of the camera. Has any one tried ?

    Thanks
    Kumar

  2. #2
    Nokia Developer Moderator
    Join Date
    May 2007
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    21.46 N 72.11 E
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    3,796

    Re: Calculate distance between the phone and object

    Quote Originally Posted by gmkumar2005 View Post
    Hi all
    Is it possible to calculate distance between the mobile and object in the viewfinder.
    I guess it should be possible by using auto focus feature of the camera. Has any one tried ?

    Thanks
    Kumar
    There was such an example in the FN Wiki Python section, but we had tested it and it was not working!
    Pankaj Nathani
    www.croozeus.com

  3. #3
    Super Contributor
    Join Date
    Mar 2003
    Location
    Espoo, Finland
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    976

    Re: Calculate distance between the phone and object

    Quote Originally Posted by gmkumar2005 View Post
    Is it possible to calculate distance between the mobile and object in the viewfinder. I guess it should be possible by using auto focus feature of the camera.
    Well,

    ... don't know anything about auto focus, but there could be a simple way: calibrate your system beforehands. The "calibrate" means that your object is e.g. 100 pixels wide at distance of 1 meter. Then measure what the width is at 2 meters and create a generic distance calculating algorithm. Most likely it wouldn't be linear, so better check more points...

    Please note: you do need to have some fixed element(s). You cannot estimate distance to arbitrary sized/positioned object. As an example: how would you estimate distance to a real car vs. toy car, if you have nothing to tell whether the object is real one or a toy?

    Maybe that would work,

    --jouni with lots of toy cars around

  4. #4
    Registered User
    Join Date
    Nov 2008
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    11

    Re: Calculate distance between the phone and object

    Thanx jouni
    Kumar

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