The Camera Oximeter uses the camera of a mobile phone as a photo detector. Illumination of the finger is provided through the integrated flash light. This allows completely eliminating external hardware, which allows the camera phone to become a standalone vital sign recording device at minimal cost (no additional cost other than the phone and the software). This principle has been applied in many mobile phone software applications available in various software repositories to measure the HR of the user. Preliminary research has shown that the extraction of SpO2 from a video recorded with a mobile phone is also possible. We have further extended this approach and want to calibrate and validate a software implementation of this approach.