absolute difference of following frames

Hi all

I am trying to continually acquire frames from a webcam, display them, and also display the absolute difference between the following frames. The last part does not work: the screen remains white. Anyone have any suggestions as to what is wrong? I'm fairly new, so I'm probably forgetting something basic. If it is possible, I don't want to use the VI to enter two times, because that would lower the rate.

I enclose my VI.

Koen

The program is not properly sequenced.  It has nothing to make the difference calculated before last is replaced by the current.  If the replacement occurs first, the difference will be zero.  If the subtraction is the first, everything works as desired.

You can either use a flat sequence structure to make things in the order you want, or you connect the output of the subtraction error in the entry on the copy error.

In answer to your other question, the conversion to intensity above all else is fine.  It uses less memory to store an image in grayscale, and operations will be faster.

Bruce

Tags: NI Hardware

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