Lut Index; Lut Value; Gamma; Linear And Dark Compression - JAI GO-5000M-PMCL User Manual

9.3.2

LUT Index

This represents the "starting" or "input" pixel value to be modified by the Lookup Table. The GO-
5000M-PMCL has a 32-point Lookup Table and GO-5000C-PMCL has a 16-point table. Thus, in the GO-
5000M-PMCL, an index value of 0 represents a full black pixel and a value of 31 represents a full white
pixel. For the GO-5000C-PMCL, the corresponding index values range from 0 to 15. The index point values
are automatically scaled to fit the internal pixel format of the camera. This is common for all output
configurations.
9.3.3

LUT Value

This is the "adjusted" or "output" pixel value for a given LUT index. It has range of 0 to 4095 (12-bits)
and is automatically scaled to the bit depth of the current output mode (8-bit, 10-bit, or 12-bit).
Note: Linear interpolation is used to calculate LUT values between index points. In the color model, the
LUT function works the same regardless of the color of the pixel.
9.4

Gamma

This command is used set gamma. Gamma 0.45, 0.6 and 1.0 (OFF) can be selected. The gamma value is
an approximate value.
9.4.1

Linear and Dark Compression

GO-5000-PMCL has a dark compression circuit to improve the signal-to-noise ratio in the dark portion of
the image.
Dark Compression
Linear(Factory default)
Dark Compression
The following drawing is characteristics of linear and dark compression.
GO-5000M-PMCL / GO-5000C-PMCL
No compression, Gamma=1.0
Compress the signal level in the dark portion. It can improve the signal to
noise ratio, but on the other hand, the linearity will be deteriorated.
Fig.27 Gamma correction
Function
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