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Article Data
Article Ref
5878-LXVB-9127
Date Created
Fri, 28th Feb 2014
Date Modified
Fri, 4th Jul 2014

   Tracking window versus active area (G2xxx)

Question 

What is the tracking window and what is the difference between tracking window and active area?

Answer 

Sensor Model G2xxx
Firmware Version 3.x, 4.x
SDK Version n/a

Both active area and tracking window provide a way of improving scanning speed.

Active area refers to the user-defined region within the sensor's maximum field of view that is used for laser profiling. By default, the active area covers the sensor's entire field of view. But by reducing the active area, the sensor can operate at higher speeds.

Tracking window is useful in scenarios where the target can be moving up or down, such as when scanning a road surface. The tracking window is a user-defined area within the field of view that moves up and down as needed to make sure the sensor continues to scan the target.

The main difference is that the tracking window can search the whole measurement range to find the target again, once the defined Search Threshold (the minimum percentage of points detected across the profile for the laser to be considered tracked) is reached. The drawback is a potential loss of scanning speed, once the tracking window is searching for a signal across the whole measurement range. With active area, however, the Gocator doesn't try to find the target once it is outside that defined area.