Instruction manual

Video formats, modes and bandwidth
MARLIN Technical Manua
l
Page 73
10.6 Area of interest (AOI)
The image sensor on the camera has a defined resolution. This indicates the maximum number of
lines and pixels per line that the recorded image may have.
However, often only a certain section of the entire image is of interest. The amount of data to be
transferred can be decreased by limiting the image to a section when reading it out from the
camera. At a lower vertical resolution the sensor can be read out faster and thus the frame rate is
increased.
 The setting of AOIs is supported only in video Format_7.
While the size of the image read out for most other video formats and modes is fixed by the IIDC
specification, thereby determining the highest possible frame rate, in Format_7 mode the user
can set the “upper left corner” and “width and height” of the section (Area of Interest) he is
interested in to determine the size and thus the highest possible frame rate.
Setting the AOI is done in the IMAGE_POSITION and IMAGE_SIZE registers.
Attention should be paid to the increments entered in the UNIT_SIZE_INQ and
UNIT_POSITION_INQ registers when configuring IMAGE_POSITION and IMAGE_SIZE.
IMAGE_POSITION and IMAGE_SIZE contain in the respective bits values for the column and line of
the upper left corner and values for the width and height.
Figure 43: Area of Interest