How can we Scan a wall

Is there a way we can scan a complete portion of wall vertically using lasers or any other device?

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ap nambiar (author) 5 years ago
thanks for responding guys :)
actually its not a wall...its a white board..i want to make a sensor which senses if there is anything on the board and then cleans it.....
a high degree of accuracy is not needed* :)
Moem ap nambiar5 years ago
Wouldn't it be easier to clean it periodically no matter whether there is anything on it or not?
Anyway, I think the combination of a webcam and image recognition software is a possible solution.
So you need a web cam with some image recognition software?
Why didn't you ask the question "i want to make a sensor which senses if there is anything on a white board and then cleans it"?

-Can't you see that it needs cleaning and do it yourself?

Jayefuu5 years ago
Over what distance? To what accuracy? From what range? And just out of interest, why?
Kiteman Jayefuu5 years ago
Oh, I hope they're building a rock-climbing robot!

I wonder, would this be an appropriate use of 123D Catch?
ap nambiar (author)  Kiteman5 years ago
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caitlinsdad5 years ago
take a digital picture of it and compare it with a reference photo to see if there are any changes. You might have to take an IR lit image or have good enough lighting conditions to sense a difference. There should be software out there to compare images and distinguish shapes. Technique is used in those instructables for the projection or widescreen touch mouse.
Try "DAVID-scanner"