bead tracking algorithm

[another_novice]

Hello,

I want to track a dark line as it meanders through an image. I'm thinking to use a 3X3 grid, find the darkest pixel, center the grid on that, and loop around. (Obviously, a bit more complex than that.)

Rather than re-invent the wheel, I wondered if there is any existing code or maybe an example, that I could build on.

Many thanks,

Another

[Silver_Shaper]

Why dont you try IMAQ LOCAL Threshold function.

[another_novice]

Thanks, I'll give that a try.

Incidentally, I found information on how the niblack algorithm works here: http://zone.ni.com/reference/en-XX/help/372916J-01/nivisionconcepts/thresholding/