Itala | INSTRUCTION MANUAL
TestPattern Selects the type of test pattern
that is generated by the device
as image source
IEnumeration RW
Table 15: Image control features
6.2.1 Image ROI
The Width, Height, OffsetX, OffsetY parameters are used to change the image format and to
stream only a part of the full resolution image: in particular, the offsets set the displacement of
the ROI (region of interest), while the width and height parameters set the effective dimensions of
the image.
The sum of OffsetX and Width cannot exceed the WidthMax value and the sum of OffsetY and
Height cannot exceed the HeightMax.
WidthMax and HeightMax are sensor specific and cannot be set by the user.
In Fig.36 is shown a graphical explanation of these parameters.
offset_x
width
ROI
FULL RES
IMAGE
height
offset_y
Figure 36: Image ROI paramenters.
6.2.2 Binning
Binning mode is used to increase camera sensitivity by summing the values of adiacent pixels, with
the drawback of a lower effective resolution.
As depicted in Fig.37, a 2x1 binning halves the image resolution along the x-axis, but the overall
image brightness is doubled (since two adiacent pixels have been combined). If a 2x2 binning is
performed, the image resolution is one quarter of the initial one, but the brightness is four time
the initial brightness.
In case of color sensors, Bayer filter must be taken into account: since adiacent pixels have different
chroma information, binning is performed on alternate pixels, as depicted in Fig.38. In this way,
chroma information is not affected by algorithm artifacts.
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