R G R G R G R G R G R G
G B G B G B G B G B G B
Bayer pattern filter – sensor has no gap between pixels or lines
OVERVIEW
The dual line sensor offers high flexibility so that
the sprint can meet a wide variety of application
requirements and can be easily integrated. Some
of the main unique properties and features of
the Basler sprint are:
AOI (area of interest) with linear speed increase
The AOI feature lets you focus precisely on the area
of an object that is important to you. This means
that the amount of data transmitted by the camera
will be reduced and that the image processing
application in your host PC will not be overloaded
with unnecessary data. In addition, you may see a
linear increase in the camera’s speed by reducing
the AOI.
Time delayed line sum
This feature uses the dual line sensor to scan
each object line twice in a time delayed fashion.
The double information is combined in the sprint’s
internal memory and this technique doubles the
sprint’s sensitivity. It also significantly reduces
noise and results in a 3 dB increase in the SNR.
Time delayed line averaging
With this feature, time delayed line summing is
performed and then the doubled information is
averaged. The advantages are an increase of
3 dB in the SNR and an increase of 3 dB in the
dynamic range.
Binning
Both horizontal and vertical binning are available.
Either two pixels or four pixels can be binned
together (see the graphics illustrating binning).
Shading correction (flat field correction)
DSNU (dark signal non-uniformity) and PRNU
(photo response non-uniformity) can be performed
to correct for the non-homogeneous behavior of
lighting, optics, and the sensor that can be present
in real world applications. Shading or vignetting
caused by lenses can be compensated by the
enhanced shading correction (ESC). The wide
range of the ESC is very helpful for image
processing, especially with larger sensors and
lenses with shorter focal lengths (please ask for
‚ESC models‘).
Color
A Bayer pattern filter is used to create the color
version of the sprint. One line in the sensor reports
red and green information and the second line
reports green and blue information. Image data
in a raw format is transferred to the frame grabber
where color processing happens in a fast, reliable
way similar to common color area scan cameras.
Several color creation schemes can be implemented.
Depending on the application needs, the active
color concept can focus on speed and reducing
the amount of data, or it can focus on higher color
fidelity. For higher color fidelity, each object line
is scanned twice, thus two times color information
is available for each image point. This approach
has a big advantage because standard lenses
and frame grabbers can be used. Because there
is no gap between the sensor’s two active lines,
adapting the camera to your application/object is
easy and no spatial correction is needed (see the
Bayer pattern graphic).
Vertical Binning
Horizontal and Vertical Binning
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