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H1A424M167 View Datasheet(PDF) - Hynix Semiconductor

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Hyundai Electronics Industries Co., Ltd.
H1A424M167
within the defined color and luminous range on this register will be used for AWB.
[ 7. .5 ] Cr+Cb Range Selector
[ 4. .2 ] Cr Range Selector
* Note : 0 to 7 are allowed for Cr+Cb range and Cr range.
Larger value means wider AWB white spot.
[ 1 ] Luminous Range selector
1 : Reject too Dark and too Bright pixels for AWB
0 : Use all pixels for AWB
[ 0 ] AwbWin
0 : Whole 9 AWB windows used
1 : Only center AWB window used
[R/W]
[R/W]
[R/W]
[R/W]
AWB Lock Control Register[AAh]
[B5h]
[7]
[6]
[5]
[4]
[3]
[2]
[1]
[0]
This Register is used for AWB Lock Control. The difference between Cr/Cb target and
current frame Cr/Cb mean is used for AWB lock/unlock scheme. As the difference is
smaller, we can get the good white balanced image. The difference is compared with
AWB lock range value and AWB unlock range value. If current state is out of white
balance, AWB logic change the R/B gains of CMOS Image Sensor to make the
difference less than the lock range value. If the difference is less than lock range value,
we consider white balance is achieved and no more gain control made. After getting
white balanced image we have to compare the difference with unlock range value to
check the image is out of white balance or not. If the difference is larger than the unlock
range value, AWB logic start to change R/B gains again to find new white balance
point.
[ 7 ] AWB Lock_Unlock Function Enable Bit
[R/W]
0 : Lock, Unlock Function Disable. In this case AWB Unlock Range is used for
both Locking and unlocking. AWB lock range is not used.
1 : Lock, Unlock Function Enable. In this case AWB lock range and AWB
unlock range are defined separately for locking and unlocking.
[ 6..4 ] AWB Lock Range
[ 3..0 ] AWB Unlock Range
* Note : When AWB lock_unlock function is enabled, AWB unlock range have to be
larger than the lock range. As the larger value of lock/unlock range, we can get the
stable image. And as the small value of lock/unlock range, we can get the fine white
balanced image.
1999 October 11
Page 32
 

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