LSM 710 and LSM 780
TOOLS, ADDITIONAL SOFTWARE
Systems
3D for LSM
Carl Zeiss
02/2010 M60-1-0025
e
45
Grey High
High grey value threshold of the region to be displayed
Aperture
Measure of the extent of the highlights
Reflection
Weight of the defuse brightness components in comparison to the highlights
Auto Update
0 - Function execution is performed on
OK
or
Apply
1 - Function execution for the current angle is performed on any parameter
change
Show Cube
0 - The wire frame cube is not shown
1 - The wire frame cube is shown in the
Display window
Render - Surface: Method Description
This method displays the surface of structures in the
Input
sequence shaded as if a light illuminated it.
The position of the light is behind the view point with parallel rays in the direction of the sequence.
The input sequence is segmented into object and background by grey value thresholding: object voxels
are within the grey value range
Grey Low
to
Grey High
.
Each
Output
pixel corresponds to a point at the surface at which the ray in view direction through the
Output
pixels hits the surface. All rays are parallel.
The surface normal required for shading in this gradient renderer is the grey value gradient in the
Input
volume at the surface voxel position. It is not the geometric surface normal. The grey value gradient is
determined from the grey values in a 3x3x3 cube around the surface voxel by averaging e.g. the x-
gradient in y- and z-direction [4].
There is no depth cueing (far objects would appear darker).
The illumination model is a Phong model [1] (surface normal is determined for each
Output
pixel) with
diffuse reflection and specular reflection. Diffuse reflection means that the surface reflects light with
equal intensity in all directions. The brightness of a given surface patch depends not on the view-
direction, but only on the angle between light and surface normal. Specular reflection is observed on
shiny surfaces as a highlight. The light is reflected as from a mirror. The maximum intensity is observed
when the view direction is the one of the mirrored light direction.
