This method performs high-pass filtering. The high pass filter is defined as the difference between the original image and the low-pass filtered original.

Parameter

Description

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.

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Wrap

If a resulting value is larger than the maximum pixel value of the image, the difference exceeding the maximum pixel value is added to 0. Similarly, if a resulting value is below 0, the resulting pixel value is the maximum pixel value minus the difference falling below 0.

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Shift

Normalizes the output to the value "pixel value + maximum pixel value/2". As a result, all resulting values are mapped to the available value range.

The middle value of the pixel value range remains constant. Values left and right of the middle value are changed progressively, so that values inside the pixel value range are changed only slightly. Values outside the pixel value range are changed strongly and mapped to the fringes of the pixel value range.

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Absolute

Converts negative pixel values into positive values. Positive pixel values exceeding the maximum pixel value are set to the maximum pixel value.

Parameter

Description

Count

Here you set the number of repetitions. I.e. the number of times the function is applied sequentially to the respective result of the filtering. The effect is increased correspondingly.

Kernel Size

You can set the filter size in the x-, y- and z-direction, symmetrically around the subject pixel. This should be the size of the transition region between objects and background match.