Changes To The Max Frame Rate With Area Of Interest - Basler A400K User Manual

Basic Operation and Features

3.8.3 Changes to the Max Frame Rate with Area of Interest

When the area of interest feature is used, the camera's maximum achieveable frame rate
increases. The amount that the maximum frame rate increases depends on the number of lines
included in the area of interest (AOI Height) and the width of the area of interest (AOI Width). The
fewer the number of lines in the area of interest and the smaller the width, the higher the maximum
frame rate.
To determine the maximum frame rate for a given AOI, use your AOI settings to calculate a result
in each of the two formulas below. These formulas take your AOI size into account. The formula
that returns the lowest value will determine the maximum frame rate for the given AOI.
Formula 1:
A402 : Max. frames per second (approximated)
k
A403 :
Max. frames per second (approximated)
k
A404 : Max. frames per second (approximated)
k
Formula 2:
Maximum frames per second (approximated)
For example, using the full AOI height of 1726 lines, the frame rate cannot be higher than
126.9 fps (frames per second). With an AOI height of 200 lines, the frame rate cannot be higher
than 1085.6 fps.
In some exposure modes, you must set the frame period in [µs]. To convert the calculated frame
rate (frames per second) into the frame period [µs], use the following formula:
Frame period [µs]
3-26
DRAFT
1
×
------------------------------------ -
= 1 000 000
Frame rate [s]
50 MHz
=
----------------------------------------------------------------------------------------------------- -
⎛ AOI Width
-------------------------- - + 8
⎝
2
50 MHz
=
----------------------------------------------------------------------------------------------------- -
⎛ AOI Width
-------------------------- - + 8
⎝
4
50 MHz
=
----------------------------------------------------------------------------------------------------- -
⎛ AOI Width
-------------------------- - + 7
⎝
8
1
=
---------------------------------------------------------------------------- -
×
( )
AOI Height + 2 4.56 µs
⎞
×
(AOI Height + 1)
⎠
⎞
×
(AOI Height + 1)
⎠
⎞
×
(AOI Height + 1)
⎠
Basler A400k