The Thresholds tab contains the following groups, each with their own options:

• Classification

• Trainingset Extension

• Filter Options

The Classification group contains the following options:

Threshold for classification

Set the classification threshold by using the Threshold for classification slider or entering a number between 0 and 100%.

The classification threshold defines the similarity that an image has to have to be added to an existing class. The default setting is 70%. Below 60%, classification errors are likely to occur. Above 70%, more classes than necessary are created.

The Trainingset Extension group contains the following options:

Threshold for trainingset extension

Set the threshold for training set extension by using the Threshold for training set extension slider or entering a number between 0 and 100%.

The training set of a class is automatically extended during clustering by good examples that have some features that are not already learned in the pattern of a class. The threshold for training set extension defines the minimum amount of similarity that an image has to have to be used as a new sample image in the training set. Increasing this value adds fewer samples to the training set. The default setting is 95%. If this threshold is below 80%, classification errors are likely to occur.

The Filter Options group contains the following options:

Move dark and white images into the class "Null"

Enable this option if the document contains any unusable, blurred, dark, or white images that do not contain enough information to be classified. These images can be assigned to a null class. This ensures that these documents are not included in the training set or the classifier.

This option is cleared by default.

Remove folders containing only one image after a certain number of steps and move the image into the class "NoMatch"

Enable this option to eliminate any class folders that contain a single document. It is likely that this document is not correctly classified, so moving it would improve subsequent results using that training set.

This option is cleared by default.

Number of steps

If the Remove folders option is selected, this option is enabled. You can specify how many steps should run before any class folders containing a single document are moved to the "NoMatch" class. Set this number by using the Number of steps slider or enter a number between 0 and 1000.

This option is set to 1000 by default.