How does the Gemini 335 IR camera read QR codes in low light?

Technical Support & Q&A Basic
1

Hello everyone, I’m using the Gemini 335 IR camera (Intel RealSense) and encountering some difficulties in low-light conditions:

Recognition capability: In dark or extremely low-light environments, is the IR sensor of this model sensitive enough to clearly see details like QR codes? Or will the image be excessively noisy?

Additional light source: Is it necessary to equip an external IR LED?

Equipment advice: If an external IR LED is needed, what wavelength (850nm or 940nm) would be optimal for this sensor? What is the power rating? Are there any specific models I can refer to?

Installation: What are some tips on installing the LED to avoid glare on the QR code surface (usually glossy labels)?

I would greatly appreciate any experiences from those who have implemented this in practice. Thank you!

2

I don’t know about the QR code reading but the Gemini series of cameras are active stereovision, meaning they project IR dots onto the scene then need to see those dots to function well.

If you illuminate your scene with IR LEDs then you will create a lot of ambient IR, which runs the risk of washing out the laser dots and making it difficult or impossible for the camera to estimate depths.

None of these cameras do well in high ambient-IR environments and that’s essentially what you’d be creating. These are meant as depth cameras, not night-vision cameras.