This method is an edge filter, which calculates the variance of each pixel with its neighboring pixels by the lateral filter size. The variance is calculated in the x and y directions and each pixel in the output image represents the average of the two variances.

Parameter

Description

Kernel Size

Specifies the number of pixels in the different directions taken into account to calculate the variance.

Normalization

Defines how out-of-range pixel values are mapped.

The calculated pixel values of the output image may be out-of-range and are mapped into the available range.

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Clip

Values exceeding the pixel value range are set to the highest value available (white), values falling short of the pixel value range are set to the lowest value available (black). The effect corresponds to underexposure or overexposure. This means that in some cases information is lost.

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Automatic

Normalizes the pixel values automatically to the available pixel value range. The highest resulting value is mapped to the maximum pixel value, the lowest resulting value to 0. As a result, the whole range of resulting pixel values is compressed evenly.