The issue with exposure step(step changes is not smooth)

Autonomous Machines Jetson & Embedded Systems Jetson Xavier NX
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1

We faced with a issue under exposure control in gstreamer.
The problem is exposure value not changed smooth
for example:
imx415_set_exposure val:16666
imx415_set_exposure val:8333
imx415_set_exposure val:16666
imx415_set_exposure val:8333
imx415_set_exposure val:16666

As you can see value just oscillate from 8333 to 16666.
Is it possible to control exposure step in gstreamer?

In device tree we have:
min_exp_time = “60”;
max_exp_time = “33200”;
step_exp_time = “1”;
default_exp_time = “15000”;

command used to start gstreamer:
gst-launch-1.0 -e nvarguscamerasrc sensor-id=0 sensor_mode=0 “video/x-raw(memory:NVMM), width=3864, height=2192, format=NV12,framerate=30/1” !
nvvidconv flip-method=0 ! “video/x-raw,width=1920, height=1080” ! nvvidconv ! nvoverlaysink

3

What’s your sensor module? IMX219/IMX477?

4

We use sensor IMX415-AAMR-C

5

You need make sure the sensor driver exposure control been linearity.

6

It’s a formula to control exposure:

coarse_time_shs1 = mode->signal_properties.pixel_clock.val *
val / mode->image_properties.line_length /
mode->control_properties.exposure_factor;

I got it from imx185.c Where “val” is a value getting from gstreamer.

In most cases it works correct. But starting from val >= 8000 gstreamer val just oscillate between two values.
For example 8333 and 16666.

Is it possible to control exposure step at gstreamer side?

7

Only able control the exposuretimerange by gstreamer.
Get the information from gst-inspect-1.0 nvarguscamewrasrc.

8

I tried change exposuretimerange, it does not help.
Can you guide me where exposure step val calculated? In gstreamer or nvarguscamewrasrc?

9

If set the range to 10000 12000 didn’t help that could be the sensor driver’s problem.
BTW the AE calculated didn’t public in any source.

11

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