Using the Raspberry Pi Camera to see through the mirror

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:

The PiCamera works great normally
I can see through the mirror
My Nexus 5 camera can see through the mirror
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:
alt text

This photo is with normal camera:
alt text

This photo with PiCamera:
alt text

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

dpenney

Yeeesh that is dark - although even the pic with the normal camera is really dark. Much less contrast than I was getting, perhaps you do have a bad camera as the quality definitely shouldn’t be that poor.