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Extracting LED Colors for "AmbiLight"-Clones using a RaspberryPi, the PiCamera and OpenCV

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AmbiCam

Scripts for extracting LED Colors for "AmbiLight"-Clones using a RaspberryPi and the PiCamera.

NOTE This is a pre-alpha, work-in-progress, hobby project and is not (yet) destined to work for anybody else than my setup.

Getting started

AmbiCam does perform a homomorphic transformation to the image captured to not require the camera to be positioned directly opposite the screen.

First, start ambicam with -o to save the capture image (and stop using after a bit using Ctrl+C):

./ambicam --nosend -o img.bmp

Then, using some image processing tool like gimp, find the pixel positions of the top left, top right, bottom right and bottom left corners and provide the image and corner positions to calibrate:

./calibrate img.bmp "(145,243) (575,250) (576,486) (140,485)"

The resulting calibration will be written as ambicam.calib and can be given to ambicam now:

./ambicam -c ambicam.calib

TODO

  • Use Hyperion LED geometry (from config)
  • Fix / re-enable custom warping of the border regions
  • Automatic calibration using OpenCV and controlling leds
  • Configurable border, offset, blurring and mean calculations
  • Proper blackborder detection

Licence

AmbiCam is released under the Mozilla Public License Version 2.0.

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Extracting LED Colors for "AmbiLight"-Clones using a RaspberryPi, the PiCamera and OpenCV

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