Instruction manual
Guppy Technical ManualV7.4.0
174
Video formats, modes and bandwidth
Area of interest (AOI)
The camera’s image sensor 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 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.
Note
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 val-
ues for the width and height.