Operation and Features
3-32 BASLER L304kc
Draft
3.7 Area of Interest (AOI)
The area of interest feature lets you specify a portion of the CCD array and during operation, only
the pixel information from the specified portion of the array is signaled as valid to the frame
grabber. Pixels outside of the AOI are transmitted to the frame grabber as black pixels and
signaled as invalid to the grabber.
The size of the area of interest is defined by declaring a starting pixel and a length in pixels (see
Figure 3-22). For example, if you specify the starting pixel as 10 and the length in pixels as 15, the
camera will output all of the pixel values for the array but only pixels 10 through 24 will be signalled
as valid.
Figure 3-22: Area of Interest
When the area of interest feature is used, the number of transmitted pixels does not decrease and
the maximum achieveable line rate does not increase.
Valid pixels are signalled using the line valid and data valid bits. On the pixel clock cycle where
AOI data transmission begins, the line valid and data valid bits will become high. After the pixel
clock cycle where AOI data transmission ends, the line valid and data valid bits will become low.
For example, if you specify the starting pixel as 5 and the length as 4072, the line valid and data
valid bits will become high on the clock cycle where pixel 5 is transmitted (see Figure 3-23). After
the 4072 pixels in the AOI have been transmitted, the line valid and data valid bits will become low
indicating that valid line data is no longer being transmitted.
L
In normal operation, the camera is set to use all of the pixels in each line of the array.
To use all of the pixels, the starting pixel should be set to 1 and the length in pixels to
4080.
See Section 3.8 for information about how the camera will operate if the AOI feature
and the stamp feature are both enabled.
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