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Flare 12M CXP User's Manual
3.5.2 Piecewise HDR Exposure Mode
The Flare 12M180 camera can achieve a high optical dynamic range using the piecewise
exposure mode. This HDR mode is useful when there are over exposed areas within a
frame. The piecewise exposure mode will prevent pixels that are being exposed to large
amounts of light from over saturating while not influencing the response of the darker pixels.
Pixels which reach a programmed voltage will be clipped, while dark pixels will be left
untouched. The clipped pixels are held at this voltage for a programmed period of time. The
programmed voltage and exposure time correspond to a 'kneepoint' which creates another
piece, or slope, in the response curve. Up to two kneepoints can be programmed resulting in
3 slopes in the response curve. An example of piecewise exposure with 2 kneepoints and 3
slopes is shown in Figure 12.
IO Industries Inc.
www.ioindustries.com
Revision 2.0
Figure 12. Example pixel response in Piecewise HDR exposure mode
Pixel
Reset
Pixel
Sample
V
high
V
kp1
V
kp2
V
low
Total Exposure
Time
Kneepoint 1
Exposure
Kneepoint 2
Exposure