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Appendix C.
HDR Mode
C.1
HDR Block
With the HDR Single Line Mode, the “HDR” is calculated in the camera as following :
HDR bloc calculation :
If the double Line “AB” is saturating, the information is taken from the single line “C” (Low levels)
If the double Line “AB” is non saturating, the value taken is issued from these line but divided by 2*N : N is the
ratio set in automatic Exposure mode.
In this case, the maximum dynamic possible is 12 bits : The MSB are taken from the 8bits MSB of the Lines “AB” and divided
by 16 max
C.2
Example with Ratio 2 and 10bits output
Line C (8bit)
Lines AB (8bit)
HDR bloc
HDR Output
( 12 bit)
x
16
(12bit)
16
(12bit)
HDR bloc calculation :
If Lignes AB=saturation then
HDR =Ligne C
Else HDR=LIgnes AB/(2*N).
N= ratio = 1, 2, 4, 8.
Processing :
FFC,
Gain
Offset
(12bit)
CL
interface
(8, 10, 12bit)
Camera output
If 8bits output , only the 8MSB of the
12 bits are sent.
If 10bits output , only the 10MSB of
the 12bits are sent.
If 12bits output , the 12 bits are sent.
x
Camera output
illumination
Saturation Lines AB
Saturation Line C
1023
255
Lines AB used
Line C used
with ratio=2, the saturation is extended by a factor x4
