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OpenKinect / libfreenect2

Open source drivers for the Kinect for Windows v2 device
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Switch off IR light #338

Open grigorig opened 9 years ago

grigorig commented 9 years ago

The old Kinect V1 SDK allowed users to (temporarily) switch off the IR light. Does the new Kinect V2 hardware support this as well? The new official SDK unfortunately does not support this. If possible, this functionality should be added to libfreenect2.

floe commented 9 years ago

If it's not supported by the official SDK, then we don't really have a way to find out if it's possible at all. I assume you mean disabling just the IR light, but keeping the camera running? Based on how the ToF camera works, I'm not quite sure if this would give any picture at all.

floe commented 9 years ago

According to https://github.com/OpenKinect/libfreenect2/issues/307#issuecomment-116165299, this should be possible after all. You could just try sending this command and see what happens :-)

grigorig commented 9 years ago

Played around with this to no avail. If I send the 0x0A command after starting streaming, I don't receive any complete frames anymore. I'll maybe try some other things later.

xlz commented 8 years ago

Right now I think it's not possible to turn it off outside of the firmware. Every second 30 frames are transmitted from Kinect. Each frame has 10 layers. the 10-th layer is obtained with IR led turned off (by firmware).

floe commented 8 years ago

IIRC the 10th image isn't used in the depth calculation anyway. Could this simply be exposed as another frame type?

xlz commented 8 years ago

It could. But what is the use of it?

grigorig commented 8 years ago

I don't really understand. So the Kinect always sends layer 10 which is always recorded, with the IR LED momentarily turned off? Or what is the deal here?

xlz commented 8 years ago

The 10th layer can be used to detect special IR blinkers on Xbox One controllers. It might also be used to correct background illumination.

floe commented 8 years ago

The IR image provided by the depth processor is without ambient illumination, while the 10th image would contain just the ambient illumination. I imagine this might be useful in some computer vision scenarios?