cmucam3-software (#4) - Image Aspect (#557) - Message List

Image Aspect
 unsolved

I have CMUCAMv3, The issue im having is to do with scaling of the image, The camera is positioned directly above a level surface, I was expecting to get equal X and Y diameters for the circular objects however the Y diameter is always greater by a few pixels. Is there a setting in the software to adjust this?

http://lh3.ggpht.com/_GrIcv7S_w9M/S5ao-3ttfyI/AAAAAAAAAhA/Mmfb98L85mI/Capturecolour.PNG (Original)

http://lh4.ggpht.com/_GrIcv7S_w9M/S5ao-qIX5_I/AAAAAAAAAg4/A76MfmvGw-4/scalexy.jpg (Binary Annotated image)

Thanks

Phil

Phil
03/09/10 15:19:22 (2 years ago)
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  • Message #1129

    You can only scale down by integer values. You can decrease one axis by 1/2 or 1/4, but it looks like you need just a minor scale adjustment. I would suggest doing this as a post-processing step.

    agr
    03/09/10 20:57:01 (2 years ago)
    • Message #1130

      Thanks

      Phil
      03/10/10 06:07:27 (2 years ago)
  • Message #1132

    Hi Phil,

    This has to do with the non-equal size of the pixels of the camera module. The OV6620 datasheet says the pixels size is 9 by 8,2 µm.

    This ratio gives you the exact amount of scaling you need.

    Thank you for pointing that out...this one would have probably bitten me too :)

    Cheers, Wolferl

    Wolferl
    03/10/10 12:01:42 (2 years ago)
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