Tracking

Tracking is the frequency detection value that determines the threshold between a white bar and a black bar. This is a range of frequencies that have been divided into 127 steps. For most applications, the default tracking value (40) is robust enough to deal with most marginal signals. However, in some instances, symbols are printed on a "noisy" substrate, or symbols are relatively distant from the scanner and the signal-to-noise ratio and optical focus are not ideal. In such cases, using a combination of Gain Level and Tracking can improve decode performance by rejecting "noise" and correctly recognizing the bars of the candidate symbol.