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Range
Values
 

The range values of the measured area can be visualised
in a so-called range image. Here the user can define a
value spectrum from which grey or colour values can be
allocated to the measured points. In the case of a grey-
level coding it can for example be determined that points
further away a represented in a lighter grey and closer
points in a darker grey.


Example: historical monument


Range image (grey levels)
Range image
(grey levels)
 


Range image (colour levels)
Range image
(colour levels)
 



Example: production plant


Range image (grey levels)
Range image
(grey levels)
 


Range image (colour levels)
Range image
(colour levels)
 


 

Reflectance
Values
 

The reflectance values are visualised with a so-called re-
flectance image which is generally coded in grey levels.
The coding of the individual measured points has been
defined in such a way that the reflectance image looks
like a black-and-white photograph: highly reflecting (light)
points are displayed in a light grey and highly absorbing
(dark) points are displayed in dark grey.

Other than range values, reflectance values depend on
different factors:

reflectivity of the surface (portion of the reflected
laser light)

  • distance of the object
  • angle of the laser beam on the surface

Both values (range and reflectance value) can be obtained
independent of the light conditions in the environment.


Example: historical monument


Reflectance image
Reflectance image
 



Example: production plant


Reflectance image
Reflectance image
 


 

3D Point
Cloud
 

The Z+F Software also makes it possible to represent the
measured data in a so-called 3D point cloud. For this pur-
pose, a Cartesian transformation of the laser data (trans-
formation of the range and reflectance images as well as
the calculated XYZ coordinates) is necessary. The 3D
point cloud results from superimposing range and reflec-
tance image.

3D point clouds are the basis for subsequent modelling
in order to create CAD models.

The required range can be set individually by the user for
all three forms of representation. The picture displayed
then only shows the specified range.


Example: historical building


3D point cloud (high resolution)
3D point cloud
(high resolution)
 



Example: production plant


3D point cloud (low resolution)
3D point cloud
(low resolution)
 


 
 

 

 

 
   






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