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INTRODUCTION TO LASER SCANNING MICROSCOPY
Functions LSM 510
5-62 B 40-051 e 07/98
Application
1. This method can be applied, if the structures in the Input sequence are unsharp so that objects are
poorly defined by their grey value.
2. In this case, the Opacity Table is defined as a ramp. Low grey values have weight 0 to suppress the
background voxels. The opacity rises with increasing grey values, depending on the parameter Ramp.
The value of Max. Opacity defines the weight of the high grey values. High grey values above a
threshold have weight 255 to show the "object" voxels unsuppressed. Of course a smooth step can
be used.
3. The result is a display with inside structures shining through. A 3D impression can be obtained by
rendering with several view directions.
4. In contrast to this, a voxel renderer like the gradient renderer would display only the surface of objects
that are defined by grey value-thresholds. This surface would appear shaded as if illuminated by a
light.
5. The method can also be applied to visualize pronounced structures within other enclosing structures,
if the structures have different grey value ranges.
6. In this case, the Opacity Table is defined as a step. Low grey values (background) have weight 0. High
grey values (inside structures) have maximum weight.
Parameters:
Input Input image sequence
Output Resulting image sequence
Number of Views Number of reconstructions to be calculated
Angle X Angle of rotation on the X-axis, start position
Angle Y Angle of rotation on the Y-axis, start position
Angle Z Angle of rotation on the Z-axis, start position
Channel All - The following parameters are valid for all channels
X - The following parameters are valid for the selected channel only
Threshold Grey value where the opacity starts rising
Ramp Length of the opacity slope
Max. Opacity Maximum opacity value
Opacity Table Maximum opacity value
Auto Update 0 - Function execution is performed on OK or Apply
1 - Function execution 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
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