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4.8 Grey Level Transformation (LUT)
4.8.3 User-defined Look-up Table
In the ’User’ mode, the mapping of input to output grey levels can be configured arbitrarily by
the user. There is an example file in the PFRemote folder. LUT files can easily be generated
with a standard spreadsheet tool. The file has to be stored as tab delimited text file.
U s e r L U T
y = f ( x )
1 2 b i t
8 b i t
Figure 4.41: Data path through LUT
4.8.4 Region LUT and LUT Enable
Two LUTs and a Region-LUT feature are available in the Photonfocus MV1-D1024E camera
series. Both LUTs can be enabled independently (see Table 4.6). LUT 0 superseeds LUT1.
Enable LUT 0 Enable LUT 1 Enable Region LUT Description
- - - LUT are disabled.
X don’t care - LUT 0 is active on whole image.
- X - LUT 1 is active on whole image.
X - X LUT 0 active in Region 0.
X X X LUT 0 active in Region 0 and LUT 1 active
in Region 1. LUT 0 supersedes LUT1.
Table 4.6: LUT Enable and Region LUT
When Region-LUT feature is enabled, then the LUTs are only active in a user defined region.
Examples are shown in Fig. 4.42 and Fig. 4.43.
Fig. 4.42 shows an example of overlapping Region-LUTs. LUT 0, LUT 1 and Region LUT are
enabled. LUT 0 is active in region 0 ((x00, x01), (y00, y01)) and it supersedes LUT 1 in the
overlapping region. LUT 1 is active in region 1 ((x10, x11), (y10, y11)).
Fig. 4.43 shows an example of keyhole inspection in a laser welding application. LUT 0 and LUT
1 are used to enhance the contrast by applying optimized transfer curves to the individual
regions. LUT 0 is used for keyhole inspection. LUT 1 is optimized for seam finding.
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