Autoexposure is very slow and coarse time changes randomly

Robotics & Edge Computing Jetson & Embedded Systems Jetson AGX Xavier
22

Sorry to tell can’t configure the ISP digital gain from device tree.
You can lock WB but can’t disable it. Please check argus_camera sample APP.

23

@ShaneCCC where can i edit the isp digital gain ? From libargus application ?

Btw i tried to tune analog gain, exposure time and isp digital exposure and there still this flickering behavior.

What get me confused is that we’re using the same camera control as JetPack 4 but there is this new behavior when we migrated to JetPack 5.

Thank you for your support

24

Yes, there’s API to modify it. Please reference to argus_camera.

1 Like
25

Maybe try the antibanding.
You can configure it via argus_camera UI

1 Like
26

With gstreamer:

gst-launch-1.0 nvarguscamerasrc gainrange="8 8" ispdigitalgainrange="4 4" wbmode=off awblock=1 ....

For more options, see:

gst-inspect-1.0 nvarguscamerasrc

EDIT: Also noticed same filckering when using a different framerate than native sensor mode. Be sure that your gstreamer framerate after nvarguscamerasrc is the native framerate of sensor-mode.

1 Like
27

Hey @Honey_Patouceul thank you for your suggestions

To summarize, i had a driver for ar0820 sensor that i was using in JetPack 4.x, there was no flickering and AE issues.

Since i migrated the driver from JetPack 4.x to JetPack 5.x, this issues appeared.

I didn’t changed the camera control part in the driver (I mean the low level registers values and behavior).

The only thing i changed are the serdes_pix_clk_hz from 833 Mhz to 416 Mhz due to the deskew calibration in JetPack 5.x

That’s why i am confused why this issues appeared even if am using the same camera control and the same setup

Regarding the frame rate i am using 30 fps, it’s the frame rate of the sensor and the one used in gstreamer, also i tested using LibArgus samples, and still the same flickering behavior

Thank you again for your support

28

Boost the clocks to try due to pix_clk_hz reduce.

sudo su
echo 1 > /sys/kernel/debug/bpmp/debug/clk/vi/mrq_rate_locked
echo 1 > /sys/kernel/debug/bpmp/debug/clk/isp/mrq_rate_locked
echo 1 > /sys/kernel/debug/bpmp/debug/clk/nvcsi/mrq_rate_locked
echo 1 > /sys/kernel/debug/bpmp/debug/clk/emc/mrq_rate_locked
cat /sys/kernel/debug/bpmp/debug/clk/vi/max_rate |tee /sys/kernel/debug/bpmp/debug/clk/vi/rate
cat /sys/kernel/debug/bpmp/debug/clk/isp/max_rate | tee  /sys/kernel/debug/bpmp/debug/clk/isp/rate
cat /sys/kernel/debug/bpmp/debug/clk/nvcsi/max_rate | tee /sys/kernel/debug/bpmp/debug/clk/nvcsi/rate
cat /sys/kernel/debug/bpmp/debug/clk/emc/max_rate | tee /sys/kernel/debug/bpmp/debug/clk/emc/rate
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