Symbol Recognition
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  1. #1
    Join Date
    May 2011
    Posts
    1

    Question Symbol Recognition

    Hello,

    i search an algorithm for recognition symbols in images (made by cam).

    The symbols are very easy, like circle, rectangel, hearth, or simple characters, numbers. But only 1 max. 2 symbols must be recognited.

    Preferred code for c#, visual basic, java.

    Important is, that the alignment of the image is free. Any angle was possible. It don't must recognize colored images. b/w is enough.

    Thanks for any help,

    Carsten



    ps: if you know a german tutorial i forever thankful ;-)

  2. #2
    Join Date
    Nov 2008
    Location
    England
    Posts
    748

    Re: Symbol Recognition

    You could start here.
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    Get STLFilt here to radically improve error messages when using the STL.
    Get these two can't live without C++ libraries, BOOST here and Loki here.
    Check your code with the Comeau Compiler and FlexeLint for standards compliance and some subtle errors.
    Always use [code] code tags [/code] to make code legible and preserve indentation.
    Do not ask for help writing destructive software such as viruses, gamehacks, keyloggers and the suchlike.

  3. #3
    Join Date
    Feb 2011
    Location
    United States
    Posts
    1,006

    Re: Symbol Recognition

    Might want to look into Viola-Jones image detection or Google around for Haar-like feature detection. You might also look at the OpenCV library (link); I've used it before and it's a solid library.

    You will probably have to address orientation in a somewhat more complex way. I am not an expert on this subject, but I was taken to understand that many computer vision methods are very sensitive to differences in orientation. This may be a subject of ongoing research, so you might check out Google scholar for some idea.

    Hope that helps point you in the right direction. Let us know if that was helpful and what you end up doing!
    Best Regards,

    BioPhysEngr
    http://blog.biophysengr.net
    --
    All advice is offered in good faith only. You are ultimately responsible for effects of your programs and the integrity of the machines they run on.

  4. #4
    Join Date
    Feb 2011
    Location
    United States
    Posts
    1,006

    Re: Symbol Recognition

    re: Viola-Jones: here is the original paper: http://research.microsoft.com/en-us/...Jones_IJCV.pdf

    I think you should find it relevant to your problem (and otherwise a good read!).
    Best Regards,

    BioPhysEngr
    http://blog.biophysengr.net
    --
    All advice is offered in good faith only. You are ultimately responsible for effects of your programs and the integrity of the machines they run on.

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