CAMERAS FRAME GRABBERS IMAGING SOLUTIONS
BOBCAT Hardware User’s Manual
IMPERX
Rev. 2.0.9
6421 Congress Ave.
4/8/2014
Boca Raton, FL 33487
www.imperx.com
+1 (561) 989-0006
160 of 329
2.4 BINNING
Horizontal binning combines adjacent pixels in horizontal directions to effectively create
larger pixels and less resolution. BOBCAT supports 4 binning modes 2x, 3x, 4x and 8x. In
2:1 horizontal binning mode, two adjacent pixels in each line are summed together (in the
horizontal direction), for example, pixels 1+2, 3+4, 5+6, in each line are summed together.
Horizontal
binning does not affect the frame rate. It does, however, reduce the horizontal
resolution by a factor of 2. This occurs because when binning two pixels together, only half
of the pixels per line remain. Horizontal binning 2:1 is equivalent to 2:1 sub-sampling in the
horizontal direction. The same rule applies for higher binning modes. In horizontal binning
mode, the entire image is captured and displayed, which is different than horizontal
windowing, where only a portion of the image is captured and displayed.
Vertical binning is a readout mode of progressive scan CCD image sensors where several
image lines are clocked simultaneously into the horizontal CCD register before being read
out. This
results in summing the charges of adjacent pixels (in the vertical direction) from
two lines.
BOBCAT supports 4 binning modes 2x, 3x, 4x, and 8x.
In 2:1 binning for
example,
the corresponding pixels in every two lines (1+2, 3+4, 5+6 …) are summed
together.
Vertical binning reduces the vertical resolution by a factor of 2, and almost
doubles the frame rate. This occurs because when binning two lines together, only half of
the lines need to be read out. Vertical binning 2:1 is equivalent to 2:1 sub-sampling in the
vertical direction. The same rule applies for higher binning modes. In vertical binning the
entire image is captured and displayed, which is different than vertical windowing, where
only a portion of the image is captured and displayed.
Horizontal and Vertical binning can be used simultaneously – Figure 2.11. Horizontal and
vertical binning can work simultaneously with AOI. The corresponding image sizes and
frame rates for different binning modes are shown in Table 2.3a, Table 2.3b and Table 2.3c.
“
H size”
shows the image size for different LVAL selections, “
V size”
shows the image
size for different FVAL selections, “
Speed”
shows the camera speed for slow and fast speed
modes. The speed difference is shown for the bigger LVAL/FVAL value.
Figure 2.11 – 2:2 Horizontal and vertical binning