Photon Focus MV2-D1280-640, User Manual, Page: 69 / 85

Look-Up-Table
Grey level transformation is remapping of the grey level values of an input image to new
values which transform the image in some way. The look-up-table (LUT) is used to convert the
greyscale value of each pixel in an image into another grey value. It is typically used to
implement a transfer curve for contrast expansion.
The MV2-D1280-640 camera performs a 10-to-8-bit mapping, so that 1024 input grey levels can
be mapped to 256 output grey levels (0 to 1023 and 0 to 255).
The default LUT is a gain function with value = 1.
Lut Mode:
Gain: Linear function. Y = 255 / 1023 * value * X; Valid range for value [1...4].
Gamma: Gamma function. Y = 255 / 1023^value * X ^ value; Valid range for
value
[0.4...4].
value:
Enter a value. The LUT will be calculated and downloaded to the camera.
Load File...:
Load a user defined LUT - file into the camera (*.txt tab delimited). There is an
example in the PFRemote directory (mv_d1280_640_lut.txt).
Save File...:
Save LUT from camera into a file.
It is also possible to load a user LUT-file with missing input values (LUT-addresses). Then only
pixel values corresponding to listed LUT entries will be overwritten. Example of a user defined
LUT file:
Figure 7.6: Example of a user defined LUT file
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