There are some popular apps such as Paper Camera which affect the camera 
preview.  The work is likely in implementing the onPreviewFrame:

http://developer.android.com/reference/android/hardware/Camera.PreviewCallback.html

I think that's probably where to start.

On Thursday, February 9, 2012 4:08:26 PM UTC-5, Spooky wrote:
>
> This is the effect I'm trying to get in the camera preview:
>
>    http://www.jstrack.org/appimage.html
>
> Later,
>    --jim
>
> -- 
> THE SCORE:  ME:  2  CANCER:  0
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>
>         Do not look into laser with remaining eye.
>
> Android Apps Listing at http://www.jstrack.org/barcodes.html
>
>

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