CYIWOSC3000AA
Document #: 38-19009 Rev. *E
Page 21 of 37
8.2.28
ABIN(35)
The ABIN register sets the analog binning mode.
8.2.29
HBIN(36)
The HBIN register enables and sets the value for Horizontal Binning mode or skip mode. In effect, HBIN sets the horizontal zoom
factor. There are two stages of bin/skip. The first stage can bin by 2, 3, or 4 pixels. The second stage can only bin by 2 or 3. Each
stage can either BIN or Skip independently. The BIN1/2 bits determine if subsampling (skip) or binning it to be performed.
Subsampling requires less power but may result in a sparkling of the image if details line up with the active pixel or not. Binning
averages many pixels together which is a fairly compute intensive operation and thus requires more power. Horizontal Binning
is done digitally.
The WEIGHT bit is only used if binning is enabled for X3 or X4. If X3 binning is enabled, then a weighting is applied so that the
average can be obtained with a simple shift operation instead of a divide. When WEIGHT = 1, this weighting is changed for Red
or Green-Blue pixels and for Green–red or Blue pixels. This shifts the weight from the center of the superpixel to a more correct
spatial weighting. In bin X4 mode, if WEIGHT = 1 then a weighting is applied. WEIGHT has no effect on bin X2.
The SUM bit is also only used when binning is enabled. When SUM=1, then the result of the bin is not shifted down after adding
the pixels together. This results in a 2, 3, or 4X gain which can improve images in low-light conditions.
8.2.30
VBIN(37)
Bit #
Name
DIR
Default
Function
7R
0
Reserved
6:4
HBIN
RW
000
000 = 1:1 (no binning)
001 = 2:1
010 = Reserved
011 = 4:1
1XX = Reserved
4R
0
Reserved
2:0
VBIN
RW
000
000 = 1:1 (no binning
001 = 2:1
010 = 3:1
011 = 4:1
100 = 6:1 (bin by 3 and subsample by 2)
All other values are reserved
Bit #
Name
DIR
Default
Function
7
SUM
RW
0
0 = Average the binned pixel
1 = Sum the binned pixels
6
BIN2
RW
0
0 = Subsample stage 2
1 = Bin
5:4
HBIN2
RW
00
00 = No 2nd stage binning/skipping
01 = 2nd stage bin/skip by 2
10 = 2nd stage bin/skip by 3
3
WEIGHT
RW
0
0 = 1:2:1 weighting for binx3
1 = Spatial based weighting for bin X3 and X4
2
BIN1
RW
0
0 = Subsample stage 1
1 = Bin
1:0
HBIN1
RW
00
00 = No Horizontal binning/skip—disabled
01 = Bin/skip every 2 pixels
10 = Bin/skip every 3 pixels
11 = Bin/skip every 4 pixels
Bit #
Name
DIR
Default
Function
7
SUM
RW
0
0 = Average the binned pixel
1 = Sum the binned pixels
6
BIND
RW
0
0 = Subsample Digital
1 = Bin Digital
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