Statistical features can provide valuable information alongside a CCI-Feature or a Case-Feature. Use this feature to get statistical properties of spectra resolved by pixels in the scene.


Function

Statistically derived properties of spectra are obtained. The resulting image describes statistical values by their gray values.
Statistical features are typically used as additional information together with a Case- and/or CCI-Feature. For example; the discrimination of background and foreground often can be done very robustly by means of the mean intensity feature. By streaming such a statistical information parallel to a CCI-Feature (classification IDs), the client machine vision application might be able to distinguish foreground from background objects more robustly.

User Interface

The data set plastics is loaded (the data set is selected in the project browser to the left). Per plastic group a spectra set is defined and is shown in the Selected Spectra graph as well as their originating pixel positions by colored markers in the Input view.
The model method Statistical Features is selected in the ribbon menu. The control panel of this method is shown on the lower right. The result of the method is shown in the Output view.
The preprocessing method Intensity is selected in the ribbon menu. The statistical feature Mean is selected. Spectra are shown in the range ~1000-1700nm.
The pixel values of the output image correspond to the mean of all reflectance spectra in the range from 1000-1700nm. Therefore, the output corresponds to the relative reflectance degree of 3 plastic plates in the NIR-range (1000-1700nm).
On the feft hand side, information on the loaded data set are available like the Statistics panel as well as descriptive parameters attached to the data set.

Method Parameters

Method parameters are shown in the panel to the lower left of the perspective.

Statistical feature selector

Select a feature of interest

Minimum

The output image corresponds to the statistical minimum value of spectra per pixel.

Maximum

The output image corresponds to the statistical maximum value of spectra per pixel.

Mean

The output image corresponds to the statistical mean value of spectra per pixel.

Dynamic

The output image corresponds to the statistical dynamic of spectra per pixel. The dynamic is the difference of maximum and minimum.

Work Flow

  • Select one of the statistical methods
  • Apply preprocessing
  • Study the gained output image
  • Save the model for later usage (e.g. to set up the live streaming)

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