romoval fixed particles

Lets imagine that we measure the size of the stream of movement of particles. Some of them, or just a particle of dirt that adheres to the surface of the window and is counted almost all time (image).

Y at - it VI or what would be the suggestion how to exclude static particles of the statisctics (analysis).

You use in levels of gray or binary images?

For binary images, you can keep several old pictures and use AND combine them in a mask.  The mask can be reversed and then with the current image.  Only fixed particles would be in the same place in all images.  It is easiest to store a circular buffer of 10 images.  I replace the oldest picture about once per second, and then regenerate the mask from the ten images.  This would keep only of fixed particles which have not changed in the last ten seconds.

If you are post processing, you might get a little fanciful.  You can create the mask by combining images before and after the current frame.  This could be a tighter window, perhaps a second before and after, to identify the fixed particles.  The ideal spacing between the images of reference depends on the size of particles, the speed of the particle, and possibly other factors.

For grayscale images, you can use MIN to combine images instead of AND, assuming that the white particles on a black background, then subtract the mask of the current image image to remove fixed particles.

Bruce

Tags: NI Hardware

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