Using the Raspberry Pi Camera to see through the mirror

[Synthic]

@slametps Yeah, I know the camera works well normally. So your camera works by seeing through the mirror from the other side? Did you have to tweak any camera settings or did it just work?

[lolobyte]

@Synthic yes behind the mirror glass without any tweaks.

[broberg]

Do consider that there is difference in properties between the types of two way mirrors out there,
one type could work well with a camera lens while another type doesn’t work at all.

for an example many two way coatings are made to filter out IR light.

[Synthic]

@broberg That is a valid point. How would one know what kind of two-way mirror I posess? Haven’t been able to find any “comprehensive overview” of two-way mirrors

[dpenney]

@Synthic Infrared is blocked by cameras anyway so that wouldn’t make a difference. The only thing the camera cares about is visible light so if you are able to see through the mirror you are using then there is no reason that the camera shouldn’t be able to do the same thing regardless of what material the mirror is made from.

I too have the basic PiCam located behind the glass and it works perfectly. Does your cam work without the glass in place?

[Synthic]

@dpenney That’s what bugs me:

1. The PiCamera works great normally
2. I can see through the mirror
3. My Nexus 5 camera can see through the mirror
4. The PiCamera can not. (it CAN, but it is waaaay too dark)

[dpenney]

@Synthic That is frustrating…

I think the facial recognition module uses python-picamera to talk to the camera, are you able to tweak the configs somewhere in order to up the brightness?
https://www.raspberrypi.org/documentation/usage/camera/python/README.md

[dpenney]

This is where the camera is setup - try adding
camera.brightness = 90

https://github.com/paviro/MMM-Facial-Recognition/blob/master/facerecognition/picam.py

Worth a shot :)

[broberg]

@Synthic I can tell you that my nexus 5 camera does not like my glass at all, al tough, the light transmission on my mirror is really low.

[Synthic]

@dpenney This is my setup:

This photo is with normal camera:

This photo with PiCamera:

With brightness=90, I tried screwing around with most settings without result.