2M30 User Manual - Frame Grabbers

DS-24-02M30 and DS-25-02M30 User’s Manual 63
C1 Input Luts
Appendix C
Using Look up Tables (LUTs) in
the Monochrome 2M30 Camera
Note: LUTs are available in the monochrome model (DS-24-02M30) only.
Within a multi-tap camera, each tap response can vary depending on differences in sensor
output amplifiers, analog chain components, and analog to digital converters (ADCs).
The purpose of using the input LUTs is to improve tap to tap matching over the entire
output range of possible values.
The LUT values can be loaded into the camera and then enabled or disabled as desired.
Using an input LUT on each tap will transform post-ADC image data and improve tap to
tap matching. The output response for a uniformly illuminated and uniformly flat scene
in front of the camera will be well matched from tap to tap. If the uniform illumination
level were to vary, the tap matching would continue to perform similarly. The range of
improved matching is designed to be 10-90% of the output response.
Note: Calibration of the LUTs is based on 10 bits of input image data and 10 bits of output
image data. There is the possibility of the existence of missing output codes within the 10
bit image data range as a direct result of improved tap matching.
Note: The use of the input LUT is a purely digital transformation and is constrained by
the analog signal processing circuitry left unchanged. Thus, camera performance with the
LUT enabled is not able to exceed that which is capable of the analog circuitry.
C1.1 Using Factory Calibrated Input LUTs
There are three LUTs that are allocated to the pre-set LUTs calibrated at the factory. Each
LUT is directly associated to three different gain settings: 0dB, 6dB, and 12dB.
The gain operating conditions are affected by other conditions such as analog gain,
analog offset, and calibration temperature. Best performance of the LUTs require control
of all the supporting conditions. Table 20 outlines the recommended camera operating
conditions for each factory calibrated LUT.
DALSA 03-32-10157-02