APPENDIX
iKon-L APPENDIX
Page 158
A1.1.6.2 - Horizontal Binning (Creating Superpixels)
Shifting the charge horizontally from several pixels at a time into the output node is known as Horizontal
Binning.
Horizontal binning in combination with Vertical binning allows you to define so-called superpixels that in Image
Display Mode represent as a single picture element charge that has been binned from a group of pixels. For
example, charge that is binned vertically from two rows and horizontally from two pixels before being read out is
displayed as a superpixel of dimensions 2x2 pixels. You can define these superpixels from the Imaging Dialog
Box,
On the one hand, superpixels (by comparison with single pixels) result in a more coarsely defined image when
the data are displayed in Image Display Mode; on the other hand, superpixels offer the advantages of summing
data on-chip prior to readout.
In the example below, where each superpixel is of dimensions 2x2 pixels, charge from two rows is first binned
vertically into the shift register. Charge from two pixels of the shift register is then binned horizontally into the
output node of the amplifier. The effect of the combined binning processes is a summed charge equating to a
2x2 ‘superpixel’.
Since this example initially involves binning charge from two rows, the process begins in the same way as
Steps 1 - 4 of Vertical Binning of Two Rows on page 157), then horizontal binning begins.
Charge from two rows has already been vertically binned into the shift register (please refer to Vertical
Binning of Two Rows on page 157). Now charge in the shift register is moved horizontally by one
pixel, so that charge on the endmost pixel of the shift register is moved into the Gain Register, and
subsequently into the output node of the amplifier.)
Charge in the shift register is again moved horizontally, so that the output node of the amplifier now
contains charge from two pixels of the shift register - i.e. the charge has been horizontally binned.
The charge in the output node of the amplifier is passed to the analog-to-digital converter and is read
out.
Steps 4 to 6 are repeated until the shift register is empty. The process is repeated from Step 2
please refer to page 157) until the whole frame is read out.
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