Allied Guppy, Техническое руководство, Страница: 143 / 238

Video formats, modes and bandwidth
GUPPY Technical Manual V4.0.1
143
Area of interest (AOI)
The cameras image sensor has a defined resolution. This indicates the maxi-
mum 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.
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.
Note
L
The setting of AOIs is supported only in video Format_7.
Note Attention should be paid to the increments entered in the
UNIT_SIZE_INQ and UNIT_POSITION_INQ registers when con-
figuring IMAGE_POSITION and IMAGE_SIZE.
IMAGE_POSITION and IMAGE_SIZE contain the respective bits
values for the column and line of the upper left corner and
values for the width and height.