This function enhances the contrast by linearizing the histogram of the image to equal area fractions in the histogram. The areas (pixel count multiplied by gray value range) of all gray values in the histogram of the result image are the same.

Histogram equalization maps the highest occurring pixel value to the maximum pixel value given by High Threshold and the lowest occurring pixel value to the minimum pixel value given by Lower Threshold. The pixel values in between are mapped accordingly.

As a result, the pixel values are drawn apart and the contrast is increased.

Parameter

Description

All Z

Activated: The equalization is applied to all z-planes.

Deactivated: The equalization is only applied to the currently selected z-plane.

All T

Activated: The equalization is applied to all time points.

Deactivated: The equalization is only applied to the currently selected time point.

High Threshold

Defines the maximum value to which the highest occurring pixel value is mapped. It can be set between 90% and 100% of the maximum pixel value.

Lower Threshold

Defines the minimum value to which the lowest occurring pixel value is mapped. It can be set between 0% and 10% of the maximum pixel value.