search

IntelRealSense / librealsense

Intel® RealSense™ SDK
https://www.intelrealsense.com/
Apache License 2.0
7.64k stars 4.83k forks source link

spectrum of 435 stereo imagers #1999

Closed timprepscius closed 6 years ago

timprepscius commented 6 years ago
Required Info
Camera Model D435
Firmware Version 5.9.13
Operating System & Version MacOS
Platform PC
SDK Version 2.13
Language C++
Segment others

Issue Description

It seems like the stereo imagers of the 435 are not just IR. Is this correct?

What is the spectrum of measured light?

Is there anyway to do some sort of filter so that it is just ~850nm IR, or so infrared1 & infrared2 send back just the ~850nm IR?

agrunnet commented 6 years ago

It is “all pass”. All visible and IR wavelengths. For the D435 you cannot select which wavelength it sees. For the d415 it has Bayer Pattern filters so it does have some spectral selectivity. Check out the Remove IR setting that allows you to remove the IR pattern from the left imager even when the projector is turned on.

timprepscius commented 6 years ago

Thank you for this information.

I'm going to try to apply a physical camera IR pass filter, see what effect that has.

timprepscius commented 6 years ago

Do you know how far the IR spectrum of the D435 extends? Is it 850/920/->??

agrunnet commented 6 years ago

Above 940nm but the sensitivity does fall quite fast.

RealSense-Customer-Engineering commented 6 years ago

[Realsense Customer Engineering Team Comment] hi @timprepscius,

do you need more support on this topic?