White balance & Locked white balance

[ravikiran]

Hello,

Used below args for configuring and lock the white balance.

wbmode : White balance affects the color temperature of the photo
flags: readable, writable
Enum “GstNvArgusCamWBMode” Default: 1, “auto”
(0): off - GST_NVCAM_WB_MODE_OFF
(1): auto - GST_NVCAM_WB_MODE_AUTO
(2): incandescent - GST_NVCAM_WB_MODE_INCANDESCENT
(3): fluorescent - GST_NVCAM_WB_MODE_FLUORESCENT
(4): warm-fluorescent - GST_NVCAM_WB_MODE_WARM_FLUORESCENT
(5): daylight - GST_NVCAM_WB_MODE_DAYLIGHT
(6): cloudy-daylight - GST_NVCAM_WB_MODE_CLOUDY_DAYLIGHT
(7): twilight - GST_NVCAM_WB_MODE_TWILIGHT
(8): shade - GST_NVCAM_WB_MODE_SHADE
(9): manual - GST_NVCAM_WB_MODE_MANUAL

awblock : set or unset the auto white balance lock
flags: readable, writable
Boolean. Default: false

HW Setup : imx678 + GMSL3 + Jetson orin nx jetpack 6.2

The problem is, able to set modes and lock.

But, when i exposed camera to white paper, WB mode : Auto, the colors & gains are not exactly mapped to white.

When i used WB mode : manual, green is completely dominating. I have attached pic for reference.

What is the best way to set White balance mode?

[ShaneCCC]

Auto mode and Manual mode are the same result?

[ravikiran]

No, above snap shot captured in manual mode. if i used Auto, locked as below.

in both cases, green is dominating. when i was used clear white paper

[ShaneCCC]

It’s indoor environment? How about in the outdoor?

Thanks

[ShaneCCC]

Suppose you need set the whiteBalanceGains[channel] for your environment in manual mode.

You can reference to userAutoWhiteBalance MMAPI sample code to do it.

Thanks

[ravikiran]

Hello, I was checked in manual modes,

v4l2-ctl -d /dev/video0 --set-ctrl red_balance=100
unknown control ‘red_balance’

Also, tested using multimedia APIs. But no difference. gain values are not effective to the overlays

[ShaneCCC]

What’s I want to explain is when you set AWB to manual mode you need to set the whiteBalanceGains to adjust the color to what you profer.

BTW, I don’t thin using v4l2-ctl can tell any thing here v4l2-ctl won’t invove ISP and 3A alg.

Thanks

[ravikiran]

ok, I dont see any color shift if i use nvarguscamerasrc, it is shifting only color temperatures. No shift in colors.

My observation is: Using white paper, Locked white balance. Observed other objects colors

1. unlocked white balance, using blue sheet, locked white balance
2. After locked, Observed objects there is no blue shades /color in the objects. looks same color as i was locked using white paper.

gst-inspect-1.0 nvarguscamerasrc | grep -E “gain|wbmode”
gainrange : Property to adjust gain range
eg: gainrange=“1 16”
ispdigitalgainrange : Property to adjust digital gain range
eg: ispdigitalgainrange=“1 8”
wbmode : White balance affects the color temperature of the photo.

unable to update color gains