RealSense D400 series- using multiple Camera

[TNasi1]

Hi Guys,

I have a query regarding using multiple RealSense depth cameras (D400 Series) for an application. Will these cameras interfere with each other if placed around an object to scan it from different directions simultaneously.

[MartyG]

I researched this question carefully but could not find confirmation that the D-cameras will have the anti-interference technology that the ZR300 camera does. The development branch of Librealsense (which the new RealSense SDK 2.0 is on) does have a new multi-cam sample. But that is not confirmation in itself, since Librealsense always supported multi-camera capture. The question is whether those streams would interfere with each other.

https://github.com/IntelRealSense/librealsense/tree/development/examples/multicam librealsense/examples/multicam at development · IntelRealSense/librealsense · GitHub

The D-camera are designed to synchronize with other external devices (though the documentation does not mention cameras specifically), with the ability to provide a trigger every time-frame. The D435 camera model (referred to as RS430 in the documentation) seems particularly flexible about external device synching.

https://github.com/IntelRealSense/librealsense/blob/development/doc/rs400/external_devices.md librealsense/external_devices.md at development · IntelRealSense/librealsense · GitHub

[TNasi1]

Thanks, for answering that.

I was wondering if there are any established methods such as tweaking the wavelength of each camera so that overlapping patterns are at different wavelengths and the noise can be filtered out from an image.

Any such possibilities you may know of, tried on previously released Intel depth cameras.

[MartyG]

The ZR300 camera model can use multiple cameras without interference. I have no knowledge of whether that feature is in the D-cameras though.

Another way to disrupt interference would be to place a camera on a rotating platform, or rotate the camera, so that - like a lighthouse - the laser beam faces towards an object.and then away from it for a time period, allowing another camera's laser to take a capture without an interrupting beam crossing its projection during the period when the other camera is facing in another direction.

You can install a physical external shutter, though these are reportedly ugly and expensive.

Research on the Kinect camera that breaks up interference by vibrating the camera has also been mentioned.

.https://www.precisionmicrodrives.com/tech-blog/2012/08/28/using-vibration-motors-microsoft-kinect Using Vibration Motors with Microsoft Kinect | Precision Microdrives