Dynamic Area Of Interest (A504K/Kc Only); Area Of Interest Stamp (A504K/Kc Only) - Basler A500k User Manual

Basic Operation and Features

3.9.2 Dynamic Area of Interest (A504k/kc Only)

Dynamic AOI is a useful feature for object tracking applications. It needs to be activated if you
want to displace the AOI position diagonally.
To show the usefulness of this feature, this section explains first what happens if you move the
AOI diagonally with Dynamic AOI deactivated. When you change the AOI starting line register, the
value becomes immediately active. As a result, the AOI shifts vertically in one of the next images.
Since you can only write commands to the camera sequentially, you would enter the AOI starting
column register next. The value becomes active and the AOI shifts horizontally in one of the next
images. Even if the commands are written immediately after one another, the image output is so
fast that the commands will be realized separately in different images. Shifting the AOI position
diagonally can only be achieved via an intermediate AOI position.
With Dynamic AOI activated, the AOI shifts diagonally without moving to an intermediate position.
You enter the AOI values as follows:
1. You write the AOI Starting Line register. It does not yet become active.
2. You write the AOI Starting Column register.
Now both values become active in the camera at the same time.
AOI Width and AOI Height are not affected by Dynamic AOI.
You can activate or deactivate Dynamic AOI using either the Camera Configuration Tool Plus (see
Section 4.1) or binary commands (see Section

3.9.3 Area of Interest Stamp (A504k/kc Only)

A command sent to the camera will become active only after a short latency. At low frame rates,
the command usually becomes active for the next image. At high frame rates, as for the A504k,
you do not know on exactly which image the command will become active. This information is
especially required for tracking applications where the camera is operating at a high frame rate
and the Area of Interest is changed frequently. Information about the selected AOI can be
stamped into the image.
If the Area of Interest Stamp feature is activated, the stamp is applied to the last 10 pixels of the
last line, that is, the bottom right of every image. It replaces the image information for these pixels
(1 Byte per pixel). The stamp contains the following information:
Pixel0 Pixel1
high byte low byte
Frame Counter
Table 3-3: AOI Stamp Structure
Frame Counter: 16 Bit counter. The counter is increased by one with each image and ranges
from 0 to 65535. After 65535, the counter restarts at 0. The counter can not be reset.
3-36
PRELIMINARY
Pixel2 Pixel3 Pixel4
high byte low byte high byte
AOI Starting AOI Width
Column
4.2.4.13 "Area of Interest
Pixel5 Pixel6 Pixel7
low byte high byte low byte
AOI Starting Line
Feature").
Pixel8 Pixel9
high byte low byte
AOI Height
k
Basler A500