说明书中有以下介绍： Generate Topography The three buttons provided in the Generate button bar allow you to generate the topography in different ways:
Maximum • Click on the Maximum button to calculate the topography surface by finding the maximum intensity value. If the optical section with the highest intensity value is found, the intensity values of both neighboring slices are also taken into account, so that a 3 point maximum fit is calculated. • In case it happens, that the maximum possible intensity value is present in more than one optical slice for a given pixel (saturation), the mid section of all saturated intensity slices is chosen as a reasonable approach.
Center • Click on the Center button to calculate the topography surface by using the center of gravity of all summed up intensities of the stack for a given xy print
*This mode provides better result for smooth surfaces of low intensity or nearly transparent surfaces. The receiver gain and offset has to be properly tuned and Mark First- MarkLast positions of the stack should be located approximately in the same distance from the real surface.
First / Last • Click on the First button to calculate the topography surface by using the first slice coming from the top, where the intensity reaches the value defined by the lower intensity threshold.
*This mode provides better result for surfaces of semitransparent materials with inclusions of higher reflectivity or transparent multilayers with subsurface layers of higher signal intensity.
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