1. A visualization apparatus, comprising: a differential property determination unit, implemented through a computer processor, that determines local differential properties for different regions of an image data set, including several local differential properties for a same region of the different regions of the image data set, a property weight setting unit, implemented through the computer processor, that allows a user to set property weights for the weighted combination of the several local differential properties of the same region of the image data set; an assigning unit, implemented through the computer processor, that assigns visualization properties to the different regions of the image data set depending on the determined local differential properties, including assigning a visualization property to a weighted combination of the several local differential properties of the same region, wherein a visualization property defines the visualization of a region, to which the visualization property is assigned, a hardware storing unit for storing the determined several local differential properties of the same region of the different regions of the image data set, wherein, if property weights are set by using the property weight setting unit, the assigning unit is adapted to retrieve from the hardware storing unit the local differential properties of the same region and to assign a visualization property to a weighted combination of the several retrieved local differential properties in accordance with the property weights set by using the property weight setting unit; and a display unit that displays the visualization properties assigned to the different regions of the image data set.