Allied Vision Technologies MF-145B2 Manuel d'instructions télécharger pdf (Page 120)

Marlin Technical ManualV.2.7.0

120

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.

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.

Note



The setting of AOIs is supported only in video Format_7.

Note



For more information see Table 95: Format_7 control and sta-

tus register on page 193.

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Allied Vision Technologies MF-145B2 Manuel d'instructions Page 120