piclist 2009\01\31\125945a >
Thread: Whiteboard image extraction
www.piclist.com/techref/index.htm?key=whiteboard+image
face picon face BY : email (remove spam text)(Olin Lathrop)



Philip Pemberton wrote:
> Speaking of whiteboard image extraction.. I've been (slowly) hacking
> away at a program that takes a JPEG file containing a photo of a
> whiteboard, removes the brightness variations caused by light shining
> on it, makes the background pure white, and enhances the contrast so
> you can see the text properly.

I've captured whiteboard images a number of times with great success using
two pictures.  Set the camera on a tripod, take the first picture, erase the
board, then take the second picture with the same lighting and the camera in
the same position.  A little image subtraction and scaling with existing
image manipulation programs and you get a very nice copy of the whiteboard
scribbles.


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