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RMV Operations Manual Revision Copyright illunis LLC, 2014
Page 63
4.5: Exposure:
Binning
BINNING
uses the CCD sensor to combine adja-
cent pixels and lines to effectively create larger pixels. The
RMV can bin video data independently in both horizontal
and vertical modes. Vertical binning merges the charge
from adjacent lines on the CCD and creates a composite
line in the horizontal shift register on the CCD. This binned
data is then read out as a standard line. Vertical binning
can be performed in 1 to 32 line increments. Special care
must be taken when binning very bright images as the
charge in the horizontal shift register can overflow and
cause image artifacts. Horizontal binning is performed as
digital summation within the FPGA. There is no speed
difference between digital and analog binning. Horizontal
binning can be performed in 1 to 16 pixel increments. Your
capture device must qualify the video data with the DVAL
signal for horizontal binning to function. The H-bin math
sums the pixel data. You can use the bin data average
mode to average the binned pixel data. This will reduce
noise and increase the dynamic range of the camera.
Serial Commands
Target
Index
Command
R/W Description
04
04
Mode Register
W
0xM000 = Enable Bin
04
04
Mode Register
W
0xM002 = Disable Bin
M = 0: Common—both, M = 8: Free Run only, M = 4: Trigger only
04
28
Trigger Mode V Bin
R/W Values 1 to 32 (1 is no binning)
04
29
Trigger Mode H Bin
R/W Values 1 to 16 (1 is no binning)
04
2A
Free Run Mode V Bin
R/W Values 1 to 32 (1 is no binning)
04
2B
Free Run Mode H Bin
R/W Values 1 to 16 (1 is no binning)
04
52
Bin data average mode
R/W 0x0000 = Sum binned horizontal pixel data
0x0001 = Divide sum by 2
0x0002 = Divide sum by 4
0x0003 = Divide sum by 8
Quick FAQ’s:
►Binning can be independently set for any horizontal
and vertical combination.
►Horizontal binning in and two channel camera link
data modes do not function in all modes.
►Vertical binning can overload the HCCD in bright
images.
►
Binning can create super pixels in many sizes.
►
Vertical binning will increase the power
consumption of the camera.
►
Vertical binning increases the frame rate. 2X
vertical binning is does not increase the frame rate
by 2X as some time is needed to sum the image.
►
horizontal binning can be set to sum or to average
by using the divide function.
Binning Example: Multi Spectral imaging
In a multi spectral imaging (MSI) application several camera are used, each with a different optical filter. Imag-
es from each of the cameras are processed and merged. Examples of the MSI are vegetation detection and identification.
Since MSI used optical filters of various wavelengths, the QE response of the sensor at these wavelengths will vary. To
improve image brightness binning is used.
The RMV allows for independent binning in the horizontal and the vertical directions. The horizontal binning can
be set from 1 to 16 pixels. The vertical binning can be set from 1 to 32 lines. Vertical binning is performed on chip in the
HCCD and horizontal binning is performed as a digital summation of pixels with overflow checking.
The RMV can bin pixels in any shape such as 3x7 or 9x14. Please note that when the RMV is operating in Cam-
era Link dual channel mode some horizontal binning modes are not available. This is due to the fact that the DVAL signal
Is used in horizontal binning and the DVAL cannot distinguish between the active/inactive pixels on the two channels.
DVAL is only valid for both pixels on the dual channel output. If this is a problem then use the single channel Camera Link
readout mode.