Author: Tom Zicarelli

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cv.jit motion analysis

By Jean-Marc Pelletier

http://jmpelletier.com/cvjit/

Motion Analysis
cv.jit.opticalflow Estimates the optical flow using various algorithms.
cv.jit.LKflow Estimates the optical flow using the Lucas-Kanade technique.
cv.jit.HSflow Estimates the optical flow using the Horn-Schunk technique.
cv.jit.track Track the position of up to 255 individual pixels.
cv.jit.features2track Initialize cv.jit.track to easiest pixels to track.
cv.jit.framesub Difference between consecutive frames.
cv.jit.shift Region tracking using the MeanShift and CAMShift algorithms.
cv.jit.touches Track multiple regions at a time. (Optimized for multi-touch interfaces.)

 

Project examples:

http://www.yourepeat.com/g/cv.jit

 

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Cycle-delic

Video feedback generator

By Adam Schabtach at cycling74.com 

in Max/MSP examples: examples/jitter-examples/3rd-party/Cycle-delic.maxpat

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Audio from Video

Using video to generate audio.

jit.peek~ outputs an audio signal from video matrix data.

(jit.peek~ help)

from cycling74.com

At any point in the the process, matrix data can be tapped to produce an audio signal. Analyzing video is very much like analyzing audio. For example, using envelope following and spectral analysis. Here are examples.

examples

1. jit.peek~-additivesynth.maxpat (in Max/MSP examples/jitter-examples/audio)

Draw a song

By Adam Florin and Joshua Kit Clayton

2. Frame subtraction

By Adam Rokshar

https://reactivemusic.net/?p=7005

3. Sound Emotion2 – using Macbook built-in camera

By Andreas Wittich

https://reactivemusic.net/?p=9225

4. jit.peek~-osctrack.maxpat (in Max/MSP examples/jitter-examples/audio)

Derives rhythmic audio data from video. (Using bball.mov)

By cycling74.com

5. Whispering Heights (in Max/MSP examples/jitter-examples/3rd-party/image-to-spectral-filter/whispering_heights.maxpat)

Similar to above but uses video to create a moving spectral filter.

6. Wolframatic.maxpat  (in Max/MSP examples/jitter-examples/other/Wolframatic/)

Fractal generator also generates audio.

By R. Luke Dubois