Michel,
On Wed, 10 Jan 2007 01:49:31 -0800, Michel Xhaard <[EMAIL PROTECTED]> wrote:
>> > Seem strange that we cannot change the exposure in manuel
>> > mode ?
>>
>> There should be a control to set the absolute exposure time ...
>>
>> > Is there a way to set/reset the autowhite balance too ? a lot of
>> > robotic project need these features
>>
>> ... and one for white balance temperature. I'll double check tomorrow on
>> my Linux machine but those are standard UVC controls that our cameras
>> support.
> I have try to used it (look at the last luvcview release) but that did
> not work on my orbit. luvcview use the same code for all control, each
> control can be up or down from the v4l2 step parameter luvcview test if
> we are
> between min and max and then apply the needed change. For some strange
> reason exposure and white balance always return a value outside the
> range ? maybe i am wrong here, but i don't see the reason :( Help are
> welcome !!
I've just tested it and both controls work for me. Here's what they look
like on my Fusion (2006 model):
Listing available controls for device video0:
White Balance Temperature
ID : 8,
Type : Dword,
Flags : { CAN_READ, CAN_WRITE, IS_CUSTOM },
Values : [ 0 .. 10000, step size: 10 ],
Default : 4000
White Balance Temperature, Auto
ID : 9,
Type : Boolean,
Flags : { CAN_READ, CAN_WRITE, IS_CUSTOM },
Values : [ 0 .. 9984, step size: 0 ],
Default : 1
Exposure (Absolute)
ID : 17,
Type : Dword,
Flags : { CAN_READ, CAN_WRITE, IS_CUSTOM },
Values : [ 0 .. 9984, step size: 0 ],
Default : 0
Auto-exposure mode
ID : 15,
Type : Choice,
Flags : { CAN_READ, CAN_WRITE },
Values : { 'Manual'[1], 'Aperture priority'[8] },
Default : 8
[...]
The zero step size for the absolute exposure time is obviously wrong. I
don't currently have my USB analyzer to check what's going on there. Also,
I get errors when I try to read these controls. This seems to be why the
controls don't work in luvcview.
Apart from that everything seems okay. Both controls, white balance and
exposure time, do what they should in my test application. I'll post an
update as soon as I find out what's going on there.
Cheers,
Martin
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