Intel D4XX series depth camera filter installation problem

[dingbaiyin]

In the experimental test, the HWB830 infrared high-transmittance filter is selected, and the filter is 90% high-transparent in the 850 nm band. The filter is installed in front of the two cameras without high-transparency glass, and the filter is not installed in front of the Projector, the test effect is very good. Now the company wants to integrate into the product and encounter several problems

1. Can filters be added in front of Projector
2. Is it possible to use high-transparent glass with filters in front of the camera?

[MartyG-RealSense]

1. Section 4.2 of Intel's paper about optical filters discusses the advantages and disadvantages of how adding a filter to the projector can affect the camera's performance.

For example, a long-pass filter on the projector may let IR light pass through but attenuate some of the visible light and so make the image darker. Ambient light can also help the camera to see over a greater distance range. An advantage though of a long-pass filter is that it may make distant white walls more visible to the camera.

https://dev.intelrealsense.com/docs/optical-filters-for-intel-realsense-depth-cameras-d400#section-4-the-use-of-optical-filters

2. The Chief Technical Officer of the RealSense Group at Intel (agrunnet) offers advice about choosing filters and cover materials in the links below:

IntelRealSense/librealsense#2566 (comment)

IntelRealSense/librealsense#2875 (comment)

Regarding the thin-film linear polarizers discussed in the second of the above links, more details can be found here:

IntelRealSense/librealsense#6159

[dingbaiyin]

I am surprised to receive your reply so soon. Thank you very much.

[MartyG-RealSense]

Thanks so much for your filter test feedback. I will pass it on personally to Intel.

[MartyG-RealSense]

I will close the case now. Please feel free to create new issues for further questions. Thanks!