Instruction manual
Guppy PRO Technical ManualV4.1.0
157
Video formats, modes and bandwidth
Area of interest (AOI)
The camera’s image sensor has a defined resolution. This indicates the maximum
number of rows and pixels per row 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 sec-
tion when reading it out from the camera. At a lower vertical resolution the sen-
sor can be read out faster and thus the frame rate is increased.
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 = AOI) 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.
AF_AREA_POSITION and AF_AREA_SIZE contain in the respective bits values for
the column and row of the upper left corner and values for the width and height.
Note
The setting of AOIs is supported only in video Format_7.
Note
Pay attention to the increments entering in the UNIT_-
SIZE_INQ and UNIT_POSITION_INQ registers when configuring
IMAGE_POSITION and IMAGE_SIZE.
Note
For more information see table 124.