# Sensitivity Parameter

When you use high sensitivity mode you can also set the sensitivity training parameter which allows you to specify your image quality. The sensitivity parameter is a number in the range 1.0 through 10.0 that specifies the amount of noise rejection PatMax applies to run-time images. If the sensitivity parameter is set to 1.0, minimum noise rejection is applied. If the sensitivity parameter is set to 10.0 PatMax applies the maximum noise rejection. Since portions of the pattern may appear as random noise, actual pattern features may be lost. Best results are usually achieved by using the default of 2.0. Lower sensitivity parameter values have less of an affect on training time and execution time whereas higher values tend to increase these times.

If you are having problems when using the default value of 2.0, and you suspect the cause is low contrast or noisy images, you can experiment by changing the sensitivity parameter to determine an optimum setting. Increase the sensitivity parameter to make PatMax less sensitive to random noise, and decrease the sensitivity parameter to make PatMax more sensitive to the pattern. If this helps you should find your optimal setting in the range 1.0 through 5.0. It is very unlikely that a setting above 5.0 will produce an optimal result.