Balluff MATRIX VISION mvBlueNAOS Technical Manual page 290

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Note
The mvBlueNAOS device uses 1-lane PCIe 2.0 on the Raspberry Pi Compute Module 4. If you are using
the Raspberry Pi Compute Module 4 IO Board like us, you may need to cut out the edge of the slot to be
able to insert the adapter board (like shown in the test setup above).
Though the following test has been carried out with a mvBlueNAOS2 device, it is recommended to use
the Raspberry Pi Compute Module 4 together with a mvBlueNAOS1 device due to the board's limited
PCIe speed and CPU processing power.
If you are using Raspberry Pi OS (64-bit) on the Raspberry Pi Compute Module 4, please make sure that
the Kernel version is
1.20.1.4.2.2 Additional Settings Applied On The System In order for the system's X Server not to auto-detect
the mvBlueNAOS as a GPU, the following configuration has to be adapted:
1. Create a directory
2. Create a file named
3. Added the following content to the file:
Section "ServerFlags"
Option "AutoAddGPU" "false"
EndSection
1.20.1.4.2.3 Results The following tests have been performed using different de-Bayering scenarios to achieve
the max. FPS while maintaining 0 lost images. The CPU load during the acquisition is also documented below.
Scenarios that have been tested are listed as follows:
1. When de-Bayering is carried out on the camera: The camera delivers RGB8 image data to the host system.
This setting results in a lower CPU load but a lower frame rate.
2. When de-Bayering is carried out on the host system: The camera delivers Bayer8 image data to the host
system. The Bayer8 image data then get de-Bayered to RGB8 format on the host system. This setting results
in a higher frame rate but a higher CPU load as well.
3. When no de-Bayering is performed: The camera delivers Bayer8 image data to the host system. No de-
Bayering is performed. This settings results in a lower CPU load and a higher frame rate. The behavior is
identical to monochrome cameras.
Camera Resolution
CA-BN2- 2464 x 2056
0051ZC
Camera Resolution
=5.10.11.
/etc/X11/xorg.conf.d
10-force_no_auto.conf
Pixel Format
RGB8 (on
camera) -
RGB8 (on
host)
Pixel Format
Test setup
.
under the directory
Frame Rate Bandwidth
[Frames/s] [MB/s]
25 375.47
Frame Rate Bandwidth
[Frames/s] [MB/s]
/etc/X11/xorg.conf.d
CPU Load CPU
With Image Without Im-
Display age Display
8% 4%
CPU Load CPU
With Image Without Im-
Display age Display
MATRIX VISION GmbH
.
Load
Load