JAI AD-081GE - Manual (Page 37)

AD-081GE
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High dynamic range ( Sync Mode 6)
In this mode, a roughly proportional approach is used which places an emphasis on the
image from the slower shutter speed sensor, while confining the highlights from the sensor
with the faster shutter to the highest (brightest) bits in the composite output.
The formula for the composition process is;
where,
1/m: shutter value of BW1
1/n: shutter value of BW2
BW1
BW2
V
id
eo
o
ut
pu
t
V
id
eo
o
ut
pu
t
Incoming light
Incoming light
V
id
eo
o
ut
pu
t
Incoming light
Composed video
100%
100%
100%
Fig.21 Composition of two images
Maximum dynamic range is:
When the high dynamic range mode is activated, the same composed output can be fed through
both GigE-1 and GigE-2. Set the appropriate output port to capture the image.
BW CCD 1
Image
Process
Frame
Memory
MAC PHY RJ45 GigE-1
BW CCD 2
Image
Process
Frame
Memory
MAC PHY RJ45 GigE-2
MIX
Fig.22 High dynamic range output
If the composition process is to be done on the host PC instead, set “Readout mode” to Sync
and use individual output from BW1 and BW2 to compose a high dynamic range image.
Sync mode Sync Shutter Trigger mode Output
3:High dynamic Auto BW1,2 individual Continuous Composed out
0:SYNC sync BW1,2 individual Continuous,EPS, PWC,
RCT Individual
Process in PC
Maximum dynamic range 118dB
Shutter setting : m 30 = 1/30 sec
Shutter setting : n 50,000 = 1/50,000 sec