Cheetah KAC Camera User Manual | Camera Link (CLF) Interface
October 1, 2019
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Rev 7.2
Figure 63: Dual Slop vs Single Slope Integration.
You can translate pixel data back to linear space by accounting for the different exposure
times in each of the output partitions. For example, suppose Bright pixel data is contained
between 301 and 1000 of the camera output counts (10-bit system). By subtracting 300
from every pixel with a value greater than 300 counts and multiplying the result by the
ratio of the Total Exposure (Texp) period divided by the Bright pixel exposure time, the
Bright pixel data can be properly referenced to the Dark pixel data:
Bright pixel (Linear) = (Bright pixel counts– Dark pixel max counts) x (Texp / Bright pixel
exposure time)
Another way to view the data partitioning concept is to view the histogram of the output
data (Figure 64). The histogram shows four output partitions. Bear in mind that each data
region (Dark, Bright, Very Bright, and Ultra Bright) has a different exposure time.
Figure 64: Output Partitioning Using a Histogram.
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Dual Slope Vs. Single Slope Integrations
Bright pixels integrate for 10% of exposure using 70% of
the output
Dark Pixels slope (WDR Mode)
Bright Pixels slope (WDR mod)
Non-WDR mode slope
