The D435 camera is producing inconsistent data while performing in different light conditions.

[Sanjaikrishnaa-HTIC]

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Required Info
Camera Model	Intel RealSense D435
Serial Number	830112070107
Firmware Version	5.16.0.1
Advanced Mode	YES
Camera Locked	YES
USB - Type Descriptor	3.2
Product Line	D400
Operating System & Version	Win 10
Platform	PC
SDK Version	v2.55.1
Language	python
Segment	3D Reconstruction

Issue Description

Hi everyone..!
We are trying to 3D reconstruct a Phantom. While working on that, we faced some issues with acquiring data from the camera. The camera is producing inconsistent depth data when operating in different lighting conditions. When we try to capture the point cloud data of the Phantom, the data acquisition becomes unstable or even vanishes in some bright spots on the Phantom. We fixed the camera at about 90° and a distance of 40cm to 45cm from the Phantom to acquire the point cloud data.

Light condition 1:

The depth data are missing in the bright places on the Phantom, becoming inconsistent or even vanishing

lighting in phantom:

view from realsense-viewer:

Reconstructed mesh of the phantom:

But when we try to capture the point cloud data in different lighting conditions, even with bright spots on the Phantom, the point cloud data acquisition is fine.

Light condition 2:

Lighting in phantom:

Reconstructed mesh of the phantom:

The main issue is that only in the First lighting condition the acquisition of point cloud data are unstable or missing data, but trying in different lighting condition the acquisition points are fine. Please help me to find a solution to solve this problem in first lighting condition.

[MartyG-RealSense]

Hi @Sanjaikrishnaa Your scans are high quality so this indicates to me that the overhead lights are not generating interference. Instead, where the light intensity is creating white spots on the surface due to reflected light, such areas will be difficult for the camera to analyze for depth information.

A quick fix for dampening reflectivity in object scans is to apply a fine spray-on powder such as baby powder or foot powder to the object's surface. There are also professional 3D scanning aerosol sprays available for reflection damping when scanning reflective objects such as jewelry.

If applying a powder to the object is not possible then another approach to negating glare from reflections would be to attach a thin film linear polarization filter over the lenses on the front of the camera. Any polarization filter should work so long as it is linear, so they can be obtained inexpensively by searching stores such as Amazon for linear polarization filter sheet

[MartyG-RealSense]

Hi @Sanjaikrishnaa Do you require further assistance with this case, please? Thanks!

[MartyG-RealSense]

Case closed due to no further comments received.