Page 1 of 3 123 LastLast
Results 1 to 10 of 30

Thread: Image Processsing - Road Signs

  1. #1
    Newbie
    Join Date
    Mar 2006
    Location
    Portsmouth, UK
    Posts
    26

    Question Image Processsing - Road Signs

    Hi.

    I'm having another "research based project day" and along with my "optical mouse as dead reckoners" thread, this is probably somewhat junk

    I do a lot of driving down back roads and little A-roads (UK) which i'm not familiar with, being guided by the god that is GPS.

    As i'm don't know the road, i often miss road signs - be they speed signs, turnings etc.

    Has anyone created a bit of real-time image processing software to analysis an image, looking for the tell tale round sign that is a speed limit, and then recognize the text?

    If not, does anybody have any idea how to do it?

    I'm thinking it would be cool to drive down a road, the software detect the speed limit, and have the car pc read out the speed limit...

    Could be expanded to include road signs for towns etc just in case the GPS doens't agree with the image...

    Heck... you could then improve it so that in accordance with the last speed limit, match it with the GPS system speed and let tell you know if your speeding..

    i'm guessing a good camera would be needed - a fast 640x480 at least.

    Thinking of images such as this
    Fitting out a Skoda Octavia GLX.
    Progress [__________] (ie nothing yet!)

  2. #2
    Constant Bitrate
    Join Date
    Sep 2005
    Posts
    121
    that image is WAY too big to do real time image processing on.

    You'd need an ARM9 chip hooked up to the Camera or similar and write something efficient in ASM to give you back relevant portions of the picture (eg, the road sign)

    then on your PC, have a program apply a neural net to work out exactly what the image is.

  3. #3
    Whistle Tip pimpJ's Avatar
    Join Date
    Apr 2004
    Location
    Metro, TX
    Posts
    523
    yeah, just do that...

    I consider that our present sufferings are not worth comparing with the glory that will be revealed in us.

    www.neoterikos.com

  4. #4
    Constant Bitrate
    Join Date
    Sep 2005
    Posts
    121
    i was considering it for number plates.

  5. #5
    Newbie
    Join Date
    Mar 2006
    Location
    Portsmouth, UK
    Posts
    26
    Quote Originally Posted by konnichiwa
    i was considering it for number plates.
    Yeah, i'd seen your previous posts regarding that.

    This is for something non-privacy destroying
    Fitting out a Skoda Octavia GLX.
    Progress [__________] (ie nothing yet!)

  6. #6
    Newbie
    Join Date
    Mar 2006
    Location
    Portsmouth, UK
    Posts
    26
    Quote Originally Posted by konnichiwa
    that image is WAY too big to do real time image processing on.

    You'd need an ARM9 chip hooked up to the Camera or similar and write something efficient in ASM to give you back relevant portions of the picture (eg, the road sign)

    then on your PC, have a program apply a neural net to work out exactly what the image is.
    Well, what's the likely hood of something 320x240 being able to pick up something like that?

    I guess a P-M 2 gig wouldn't cut the mustard?
    Fitting out a Skoda Octavia GLX.
    Progress [__________] (ie nothing yet!)

  7. #7
    Raw Wave shotgunefx's Avatar
    Join Date
    Apr 2005
    Location
    Boston, MA
    Posts
    1,800
    Couple thoughts,

    downsample the capture, find the interesting portion, then process that area in the larger pic. Meaning look for signs first, not numbers. I'll bet it's easier to pick a sign out then text.

    Usually they are perpendicular to your view point and squarish, that would probably help.

    Usually traffic signs are painted with highly reflective paints. I think they have some sort of metal in the paint. Maybe you can take advantage of this somehow with a lens filter or software filtering.

    Got a nitemax? Take some pics of some roadsigns, in the day. See how they show up relative to the rest of the scene.

  8. #8
    Variable Bitrate kamikaze2112's Avatar
    Join Date
    Feb 2005
    Location
    Barrie Ontario
    Posts
    406
    yea, you could take the picture, downsample it to 2 colours, black and white, and then it should be a cinch to recognize the numbers. All road signs that display a speed limit are usually made up of 2 contrasting colours, so even taking the pic and reducing it to black and white based on hue. I'll bet that even some scanner's text recognition should be able to recognise that
    Attached Images Attached Images  


  9. #9
    Raw Wave god_of_cpu's Avatar
    Join Date
    Jan 2004
    Location
    SilverSpring Maryland
    Posts
    2,960
    The red sign in that picture would be pretty easy.

    Just filter out everything not red:
    Name:  image1.JPG
Views: 864
Size:  12.2 KB

    Then threshhold it and youll find the circle:
    Name:  image2.JPG
Views: 874
Size:  5.5 KB

    YOu can find the rest of the text pretty easily with a few other tricks, the hard part is going to be doing that in a generic case though. Assuming you want to do this with just a camera while your driving down the road, you'll have to get extremely creative to filter out false positives. i.e. the red lights on cars or other things would totally screw with the recognition for the case above. You'll have ot think about every possible thing that could look similar and find a way to filter it out. i.e. restaurant signs, license plates, partially obsured signs, etc.
    StreetDeck.com Developer (I am Chuck)
    Get StreetDeck at http://www.streetdeck.com
    The Official StreetDeck Forums have moved, please visit us at http://www.streetdeck.com/forum for official support for Streetdeck.

  10. #10
    Confusion Master
    Auto Apps:loading...
    Enforcer's Avatar
    Join Date
    Sep 2003
    Location
    If you go down to the woods today, You're sure of
    Posts
    14,618
    I think kamakazee has the best solution.

    use a B/w camera and then use OCR software, trouble is , it is pretty slow, so you have to have a way of telling it to select an image and then process.

Page 1 of 3 123 LastLast

Similar Threads

  1. Road runner Ideas (BIG LIST)
    By sephiroth7 in forum Road Runner
    Replies: 9
    Last Post: 04-01-2007, 09:50 AM
  2. Help w/ backup, restore, or image drive/disk for recovery
    By ITL in forum Software & Software Development
    Replies: 6
    Last Post: 10-25-2005, 08:33 AM
  3. How do I install Road Runner ?
    By guino in forum RR FAQ
    Replies: 0
    Last Post: 03-21-2005, 02:16 AM
  4. Lilliput no image
    By linzhang in forum LCD/Display
    Replies: 6
    Last Post: 11-02-2004, 08:02 AM
  5. DWW-7VGA won't display image
    By guf in forum LCD/Display
    Replies: 0
    Last Post: 05-08-2004, 05:06 PM

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •