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5.8 Grey Level Transformation (LUT)
5.8.3 User-defined Look-up Table
In the ’User’ mode, the mapping of input to output grey levels can be configured arbitrarily by
the user. This procedure is explained in Section 8.5.
U s e r L U T
y = f ( x )
1 2 b i t
8 b i t
Figure 5.33: Data path through LUT
5.8.4 Region LUT and LUT Enable
Two LUTs and a Region-LUT feature are available in the camera. Both LUTs can be enabled
independently (see Table 5.5). 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 5.5: 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. 5.34 and Fig. 5.35.
Fig. 5.34 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. 5.35 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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