Jonathan Pord

I would like to create a small grid with my webcam. The goal is that when people pass over certain areas, it can trigger sounds. Basically I need certain areas of the camera to create a bang. I am having trouble getting started with jitter, so any information helps.

I would like to create a small grid with my webcam. The goal is that when people pass over certain areas, it can trigger sounds. Basically I

using-jitter-in-max-to-create-webcam-grid

 object reports the position of mouse clicks in its display window. Alternatively, the 

 object reports the position of the mouse in its display window even without clicking if the

 attribute is set. Look for the x and y coordinate values, and test to see whether they fall within particular regions in order to know where the mouse is in the window.

The jit.world object reports the position of mouse clicks in its display window. Alternatively, the jit.window object reports the position of the mouse in its display window even without clicking if the @mouseidle attribute is set. Look for the x and y coordinate values, and test to see whether they fall within particular regions in order to know where the mouse is in the window.


Thanks! Thats getting me closer to my goal. But how does motion in the display window become registered. For example: If I move my hand in the top right corner of the display window, how can I register that movement as a bang? Ideally Id like to divide the display window up so that different parts of the display window can be triggered by movement. Perhaps I am wrong in thinking this is possible. Maybe I need an infrared camera to detect movement instead?

This is why clarity of expression is important. When you wrote "when people pass over certain areas", your meaning of "people" and "certain areas" were unclear. I thought you meant "when a viewer of the webcam image moves the mouse over a certain area of the display window". Apparently I was mistaken. It seems you meant "when the person in the webcam's image moves in a particular region of the image". For that, I recommend Jean-Marc Pelletier's cv.jit package of external objects for computer vision. 

This is why clarity of expression is important. When you wrote "when people pass over certain areas", your meaning of "people" and "certain areas" were unclear. I thought you meant "when a viewer of the webcam image moves the mouse over a certain area of the display window". Apparently I was mistaken. It seems you meant "when the person in the webcam's image moves in a particular region of the image". For that, I recommend Jean-Marc Pelletier's cv.jit package of external objects for computer vision. http://jmpelletier.com/cvjit/ 

Agree with Christopher: cv.jit is great. But for simple motion detection on-the-grid you don't need any additional packages:

Here is a simple algorithm I'm typically using for this kind of tasks.

Yes. That's a good, concise example for detecting change in regions of the image.

great. I will be playing around. thanks a lot for sharing

Yaniki, thank you for your patch! I have some questions though:

Haven't been using Max for a while, last time 2004, and back then I was using Cyclops to trigger sounds and notes from grids and colors. It was a very easy procedure, but with cv.jit it seems more cumbersome. I'm not a programmer and I actually went over to Plogue Bidule for its simpler interface (my subjective/normative point of view), and I haven't found a way to get the motion/non-motion numbers in your jit.cellblock to trigger sounds.

If anyone knows, please instruct this comeback Max(Msp:er). Also, if anyone knows how to use color-triggering (like in Cyclops) with cv.jit, please share your experiences. 

Yaniki, thank you for your patch! I have some questions though: 

Haven't been using Max for a while, last time 2004, and back then I was using Cyclops to trigger sounds and notes from grids and colors. It was a very easy procedure, but with cv.jit it seems more cumbersome. I'm not a programmer and I actually went over to Plogue Bidule for its simpler interface (my subjective/normative point of view), and I haven't found a way to get the motion/non-motion numbers in your jit.cellblock to trigger sounds. 

If anyone knows, please instruct this comeback Max(Msp:er). Also, if anyone knows how to use color-triggering (like in Cyclops) with cv.jit, please share your experiences. 

Blessings

Thank you for the patch Yaniki. I have some questions though:

Haven't been using Max for a while, last time in 2004, and back then I was using Cyclops to trigger sounds and notes from its grids and being able to use different colors to trigger different things in Max to use in theater performances and art installations. It was a very easy procedure, but with cv.jit it seems more cumbersome. I haven't found a way to get the motion/non-motion numbers in the jit.cellblock to trigger sounds. I'm not a programmer and I actually went over to Plogue Bidule for its simpler interface and Rewire integration with Cubase (my subjective opinion).

If anyone knows, please . Also, if anyone knows how to use color-triggering (like in Cyclops) with cv.jit, please share your experience.

Thank you for the patch Yaniki. I have some questions though: 

Haven't been using Max for a while, last time in 2004, and back then I was using Cyclops to trigger sounds and notes from its grids and being able to use different colors to trigger different things in Max  to use in theater performances and art installations. It was a very easy procedure, but with cv.jit it seems more cumbersome. I haven't found a way to get the motion/non-motion numbers in the jit.cellblock to trigger sounds. I'm not a programmer and I actually went over to Plogue Bidule for its simpler interface and Rewire integration with Cubase (my subjective opinion). 

Haven't been using Max for a while, last time in 2004, and back then I was using Cyclops to trigger sounds and notes from its grids and being able to use different colors to trigger different things in Max to use in theater performances and art installations. It was a very easy procedure, but with cv.jit it seems more cumbersome. I haven't found a way to get the motion/non-motion numbers in the jit.cellblock to trigger sounds.

Haven't been using Max for a while, last time in 2004, and back then I was using Cyclops to trigger sounds and notes from its grids and being able to use different colors to trigger different things in Max  to use in theater performances and art installations. It was a very easy procedure, but with cv.jit it seems more cumbersome. I haven't found a way to get the motion/non-motion numbers in the jit.cellblock to trigger sounds. 

Using Jitter in Max to create Webcam grid