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OAK 4 SoM
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Based on
RVC4
Dot projector
Yes
Infrared
No
IMU
None
IR Projector

Looking for more details? Visit specific features at Platform -> Features

IR perception

The Pro version of this device has notch IR filters at 940nm on the stereo camera pair, which allows both visible light and IR light from illumination LED/laser dot projector to be perceived by the camera.
IR Dot Projector
IR Illumination LED

IR Dot Projector

The IR laser dot projector projects many small dots in front of the device, which helps with disparity matching, especially for low-visual-interest surfaces (blank surfaces with little to no texture), such as a wall or floor. The technique that we use is called ASV - conventional Active Stereo Vision - as stereo matching is performed on the device the same way as on OAK-D (passive stereo).On the image below there's a blank wall with no texture. Without the dot projector, (passive) depth perception is poor. With the dot projector set to ~200mA, the (active) depth perception looks much better. If you look closely at the bottom left frame, you can see little dots all around the wall.

Getting started

You can set IR laser dot projector and illumination LED via the API as below:
Python
1# Either within Script node:
2script = pipeline.create(dai.node.Script)
3script.setScript("""
4  Device.setIrLaserDotProjectorIntensity(0.5)
5  Device.setIrFloodLightIntensity(0)
6""")
7
8with dai.Device() as device:
9  # Or, using the dai.Device object from the host:
10  device.setIrLaserDotProjectorIntensity(0.5) # in %, from 0 to 1
11  device.setIrFloodLightIntensity(0.0) # in %, from 0 to 1

Dot projector specifications

Himax TL-10Datasheet
Number of dots
8208
HFOI* 50%
72
VFOI* 50%
77
VSCEL wavelength
940nm
Operating temperature
0°C to ~60°C
Temperature absolute limits
0°C to ~80°C

Power consumption

The RVC4 itself has a maximum power peaks of about 25W, which is mainly consumed by the SoC, Qualcomm's QCS8550, that is integrated inside the RVC4.
  • Max peak: 25W
  • Max average: 10-15W
  • Average idle: 1.6W
  • Booting peak: 12W
  • Booting average: 2.3W (~15sec)

Laser Safety

This product is classified as a Class 1 Laser Product under the EN/IEC 60825-1, Edition 3 (2014) internationally.
  • Do not power on the product if any external damage was observed.
  • Do not attempt to open any portion of this laser product.
  • Invisible laser radiation when opened. Avoid direct exposure to the beam.
  • There are no user serviceable parts with this laser product.
  • Modification or service of the stereo module, specifically the infrared projector, may cause the emissions to exceed Class 1.
  • No magnifying optical elements, such as eye loupes and magnifiers, are allowed.
  • Do not try to update camera firmware that is not officially released for specific camera module and revision.