Grizzly Bear nomnomnoms a Camera
Youtube Direktnomnomnom, via Science Sushi
Ein Grizzly Bär lutscht auf der GoPro von Brad Joseph.
DIY-Webcam Video Magnification
Vor einem Jahr bloggte ich über die Eulerian Video Magnification, das Video ging vor ein paar Wochen nochmal rum, dürftet Ihr mitbekommen haben. Kurzversion: Das ist eine Art Vergrößerung für minimale Bewegungen in Videos, damit kann man beispielsweise Puls sichtbar machen. Und jetzt hat Github-User thearn eine DIY-Variante davon online gestellt, die dasselbe für Webcams bietet. Ich bin gespannt, wie lange das online bleibt, die hatten sich ihre Eulerian Video Magnification damals patentieren lassen.
This application uses openCV to find the location of the user’s face, then isolate the forehead region. Data is collected from this location over time to estimate the user’s heartbeat frequency. This is done by measuring average optical intensity in the forehead location, in the subimage’s green channel alone (a better color mixing ratio may exist, but the blue channel tends to be very noisy). Physiological data can be estimated this way thanks to the optical absorbtion characteristics of (oxy-) hemoglobin (see http://www.opticsinfobase.org/oe/abstract.cfm?uri=oe-16-26-21434).
With good lighting and minimal noise due to motion, a stable heartbeat should be isolated in about 15 seconds. Other physiological waveforms, such as Mayer waves (http://en.wikipedia.org/wiki/Mayer_waves), should also be visible in the raw data stream.
Once the user’s pulse signal has been isolated, real-time phase variation associated with the detected hearbeat frequency is also computed. This allows for the heartbeat frequency to be exaggerated in the post-process frame rendering; causing the highlighted forhead location to pulse in sync with the user’s own heartbeat.
Slitscan-Webcam in your Browser
Tolle Webcam-Spielerei von Cameron Adams: Slitscan-Video im Browser.
This experiment allows you to explore 4-dimensional space using your webcam. Once you’ve given this page permission to access your webcam try slowly waving your arm before undertaking more radical experimentation in the 4th dimension.
Ich hab’ mit dem Ding ein paar alberne GIFs gemacht, die gibt’s auf meinem Tumblelog und nach dem Klick, more to come: Gib mir den Rest, Baby…
1-Bit Cam-App
Die 1-Bit-Cam für’s iPhone ging neulich schonmal rum, aus irgendwelchen Gründen hatte ich die aber noch nicht gebloggt. Ist hiermit nachgeholt.
With 1-BIT CAMERA for iPhone you can see and record your world in one bit clarity, processed with dithering algorithms pioneered by Bill Atkinson and Bryce Bayer. Those are only fancy names, of course – but! – you have probably laid eyes on their immortalized legacy as per the superior imaging seen in the original Apple Macintosh OS and the Nintendo Gameboy Camera, respectively.
PRO-GEAR SPEC
- 1-bit dynamic range
- More than 150 kilopixels
- Real-time Atkinson and Bayer dithering algorithms
- Tumble, tweet and share your bits on the Facebook
