osc-colored-blob-tracking's Introduction

osc-colored-blob-tracking

blob tracking w/ color support via OSC

Installation

Either build the sources from sketch/ or download the latest release.

Usage

Launch the .app then listen to the port 32000.

When a blob is tracked, an OSC message is sent on /blob, with the following data structure :

position	datatype	description
0	`int`	`blob.ID`
1	`String`	`blob.color_name`
2	`int`	`blob.polygon.npoints`
3 to `npoints`	`float`	`blob.polygon.xpoints[]`
`npoints + 4` to `npoints * 2 + 4`	`float`	`blob.polygon.ypoints[]`

When a blob is lost, an OSC message is sent on /remove with the following data structure :

position	datatype	description
0	`int`	`blob.ID`

In order to consolidate serv/client syncing, an OSC message is sent every X millis (see class_oscWrapper:26) on /consolidate with the following data structure :

position	datatype	description
0	`int`	`blobs.length`
1 to `blobs.length`	`int`	`blobs_id[]`

Example with Processing

import oscP5.*;
import netP5.*;

OscP5 oscP5;
NetAddress serverLocation;

void setup() {
  oscP5 = new OscP5(this, 32000);
  serverLocation = new NetAddress("127.0.0.1", 12000);
}

public void oscEvent(OscMessage message) {
  if (message.checkAddrPattern("/blob")) {
    int id = message.get(0).intValue();
    String colorName = message.get(1).stringValue();

    int npoints = message.get(2).intValue();
    int[] xpoints = new int[npoints];
    int[] ypoints = new int[npoints];

    for (int i = 0; i < npoints; i++) {
      xpoints[i] = message.get(i + 3).intValue();
      ypoints[i] = message.get(i + 3 + npoints).intValue();
    }

    // Blob blob = new Blob(this, id, colorName, xpoints, ypoints);

  } else if (message.checkAddrPattern("/remove")) {
    int id = message.get(0).intValue();
    // blobs.remove(id);
  }
}