Computer vision tricks for a "haunted house" installation.
A preset source video gets blended with live camera (shooting the same background) only where the image differs from the base frame. This makes people in the frame "ghost out" the people in the source video.
cp hauntconfig-example.py hauntconfig.py and edit.
- Shoot a video (e.g. with guvcview)
./stripvid.sh YOURVIDEO.mkv
Run ./doit.sh (see also example.desktop [for the ladies]).
Keyboard commands:
f: Toggle full screen.space(while scene is empty): Capture baseframe for all possible cam profiles with/without light (see WiFiSwitch). Beeps when done.g: Start "ghosting" (blending source video with cam). Pressing up/down arrows will increase and decrease the threshold accordingly.0,1,...,9: Jump to 0%,10%,...,90% of source video timeline.m: View the blending mask.d: Display cam image.q: Quit.
Hardware (see the Arduino folder) that switches
an AC socket on/off (used for lighting).
LIGHT_CUESHEET at hauntconfig.py controls the timing.
Note: if arduino is connected via serial (9600 bd), you can
send it '1' to turn switch on, and '0' [or anything else] to turn it off.
haunt.py prefers serial over wifi (faster response, no setup hassle).
You can use serial.sh in order to test the switch manually
(1[+enter] to select the port, then type 1 or 0 to control the switch).
