Basler A640F, User Manual

Page: 43 / 188

Basic Operation & Standard Features
BASLER A640
f
3-21
DRAFT
3.4 Area of Interest (AOI)
The area of interest (AOI) feature allows you to specify a portion of the CCD array and during
operation, only the pixel information from the specified portion of the array is transmitted out of the
camera.
The area of interest is referenced to the top left corner of the CCD array. The top left corner is
designated as column 0 and row 0 as shown in Figure 3-13.
The location and size of the area of interest is defined by declaring a left-most column, a width, a
top row and a height. For example, suppose that you specify the left column as 10, the width as
16, the top row as 4 and the height as 10. The area of the array that is bounded by these settings
is shown in Figure 3-13.
The camera will only transmit pixel data from within the area defined by your settings. Information
from the pixels outside of the area of interest is discarded.
Figure 3-13: Area of Interest
On
A641
f
monochrome cameras, the AOI feature is enabled by setting the camera to operate in
Format 7, Mode 0. This is accomplished by setting the Format field of the Current Video Format
control register (see page
4-24 ) to 7 and the Mode field of the Current Video Mode control register
(see page 4-23 ) to 0.
On
A641
fc
color cameras, the AOI feature is enabled by setting the camera to operate in Format
7, Mode 0 or Format 7, Mode 1. This is accomplished by setting the Format field of the Current
Video Format control register to 7 and the Mode field of the Current Video Mode control register
to 0 or 1 as desired. (Format 7, Mode 1 is only available on color cameras.)
If you working with a camera set for Format 7, Mode 0, the location of the area of interest is defined
by setting a value for the Left field and a value for the Top field of the Image Position control
register for Format 7, Mode 0 (see page
4-36 ). The size of the area of interest is defined by setting