[Greg McKaskle]

The LV installation contains a new example for rectangular image processing. Additionally, there should soon be a white paper posted to the NI site that will explain a few approaches.

The most obvious approach is to use the rectangle fit function, but it is quite picky, expecting angles to be quite close to 90 degrees and lines to be quite straight. Distortion due to lens and position easily cause the rectangle definition to fail its requirements.

The example in LV is particle based, and scores the particles for rectangularity, aspect ratio, and edge strength. If they score above the limits, the position and distance are calculated.

If the paper doesn't make it up soon, I'll be happy to answer other questions.

Greg McKaskle