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progressively indexed over the entire panel. Direction can be dynamically controlled by sending the
appropriate direction command to the camera or via the CLHS GPIO (General Purpose Input /
Output) control bits. The CLHS GPIO direction is controlled by writing Frame Grabber register
#80524, bit 2. Set bit 2 to 0 for forward and 1 for reverse.
It is important to note that when the camera line rate comes to a stop and the direction is changed
the correct imaging will not be achieved for several scan lines. Therefore, it is necessary for the
system to over-scan the area being imaged, including the lines that are not valid as a result of the
direction change. This will ensure that valid data will be generated on the return path, as the
camera field of view reaches the area to be inspected. The number of invalid lines that result after
the direction change are as follows:
The mechanical diagram shows which direction is designated as forward for the camera. However,
due to the characteristics of the lens, the direction of the objects motion is opposite to the image
motion direction.
Camera Orientation
The diagram below shows the definition of forward and reverse with respect to the camera body.
Note that the diagram assumes the use of a lens which inverts the image.
Figure 7: Object Movement and Camera Direction Example using a Lens
The Piranha XL Camera
Number of Rows
4
8
12
Number of Invalid Lines
7
15
23
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