The white balance

General discussion about topics related to OpenMV.
chenyukai
Posts: 12
Joined: Wed Jul 10, 2019 12:21 am

The white balance

Postby chenyukai » Wed Aug 14, 2019 1:21 am

Don't OpenMV need to turn on white balance when working?
What functions require white balance gain?
Or what kind of environment needs to be turned on?
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kwagyeman
Posts: 3514
Joined: Sun May 24, 2015 2:10 pm

Re: The white balance

Postby kwagyeman » Wed Aug 14, 2019 11:50 am

White balance is on by default for the camera modules. You should turn it off for color tracking. If white balance is not used the image colors will look off given the environment.
Nyamekye,
chenyukai
Posts: 12
Joined: Wed Jul 10, 2019 12:21 am

Re: The white balance

Postby chenyukai » Wed Aug 21, 2019 9:14 pm

Do you have to turn off the white balance when looking for color blocks?
For example, does openmv have to be on white balance to run in a factory?
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kwagyeman
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Re: The white balance

Postby kwagyeman » Thu Aug 22, 2019 1:32 am

Yes, just do:

sensor.set_auto_white_bal(False)

Immediately after resetting the sensor.

http://docs.openmv.io/library/omv.senso ... o_whitebal
Nyamekye,
chenyukai
Posts: 12
Joined: Wed Jul 10, 2019 12:21 am

Re: The white balance

Postby chenyukai » Mon Aug 26, 2019 11:20 pm

How far does the Apriltag feature recognize?
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kwagyeman
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Re: The white balance

Postby kwagyeman » Tue Aug 27, 2019 12:14 am

Depends on the tag size relative to the camera. An 8"x8" tag is about 8ft.
Nyamekye,

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