Filtering Settings

Filtering Setting for RTC360 and P-Series Scanners

The default is Medium for mixed-pixel settings. For most uses, these values should not be changed.

Remove Intensity-Overloaded Points

Points that have an intensity or reflectiveness higher than a certain level, which varies depending on the scanner used. This can be seen if the surface is a mirror or is very close to the scanner.

Remove Ambiguous Points

Both Ambiguous and Mixed-Pixel Points are points that were hit with the laser and return a signal to the scanner that is not a clear signal with a single peak. The laser is a circle that has a diameter that varies over distance from the scanner. It is possible that the circle is split between two or more surfaces and the return signal will look different than a single surface would.

Points are between two different surfaces. This can be seen if the laser hits the edge of a chair and the wall behind it. The returned signal will have an average time of flight somewhere between the two surfaces and will look like the point is floating in the air. The scanner detects the return, in this case, as 2 separate peaks in the signal and labels these points as Ambiguous.

Remove Mixed-Pixel Points

Both Ambiguous and Mixed-Pixel Points are points that were hit with the laser and return a signal to the scanner that is not a clear signal with a single peak. The laser is a circle that has a diameter that varies over distance from the scanner. It is possible that the circle is split between two or more surfaces and the return signal will look different than a single surface would.

As the measurement laser beam crosses edges and other discontinuities, the laser is reflected from different surfaces at the same time, resulting in a measured range that is a mixture of the observed ranges. This could also be a chair and the wall behind it, or perhaps it is a dense fog that returns a mix of distances. The scanner detects the return in these cases as a wide peak rather than a sharp peak and labels these points as Mixed Pixels.

The user may adjust how many Mixed Pixels are removed by setting the Mixed-Pixel Filter slider to either Low, for a small rate of removal, Medium, the default, or High, for a high rate of mixed-pixel removal. Depending on the circumstance and user preferences, retaining more (or fewer) mixed pixels can help resolve the geometry of some objects, particularly at the edges.