Cheetah KAC Camera User Manual | Camera Link (CLF) Interface
October 1, 2019
Page
107
of
135
Rev 7.2
to Very Bright pixels is set by parameter P3, which can have values ranging from 15% to
100% of the camera output (16 steps) and must be greater than P2. The Very Bright pixel
data is contained between the P2 percentage of output and the P3 percentage of output.
If P3 is set to 100%, then the camera output is partitioned into three zones.
Ultra Bright Pixels:
The exposure time for the Ultra Bright pixels is set by parameter E3.
The Ultra Bright pixel exposure time is defined as the Total Exposure Period (Texp) minus
E3. For example, if Texp (Dark Pixel Exposure time) is 50.00ms and it is desired to set the
Ultra Bright Pixel exposure time to 0.05ms, then E3 must be set to 49.95ms. (50.00ms –
49.95ms = 0.05ms).
Tub (Ultra-Bright) = Texp – E3
E3 is a value in microseconds and must have a value larger than E2, but less than Texp.
The minimum E3 value is 2 microseconds. The amount of camera output allocated to Ultra
Bright pixels is between the P3 setting and 100% of the camera output.
The following graphics provide a single knee point demonstration of the WDR function
(Figure 65). It is useful to note how the output histogram changes as P1 is varied from
75% to 50% to 25%.
