How can I use multiple webcams?

sincos

i want to use the integrated camera from the netbook and two external webcams. how can I get the index number form the cameras?

kfrajer

Check more towards the end but most of the post is informative:

https://forum.processing.org/two/discussion/comment/78656/#Comment_78656

Kf

sincos

thanks! but still doesent work with 3 webcams

kfrajer

Make sure you can access each cam individually before trying all three at the same time. Then Try two at the time. Also please post the code you have so far. Show your approach.

Kf

sincos

    //colores a elegir
    color color1 = color(0, 255, 0);
    color color2 = color(255, 0, 0);
    color fondo = color(0, 0, 0);
    //thresholds de brillo
    float treshold2;
    float treshold1;
    //cuentafotos
    int suma = 0;
    int bandera = 0;
    //importa la biblioteca de video
    import processing.video.*;

    Capture cam1;
    Capture cam2;
    //Capture cam3;para agregar mas camaras

    void setup() {
      size(640, 480);

      String[] cameras = Capture.list();
      //if de seguridad
      if (cameras.length == 0) {
        println("There are no cameras available for capture.");
        exit();
      } else {
        println("Available cameras:");
      }
      for (int i = 0; i < cameras.length; i++) {
        println(cameras[i]);
      }

      cam1 = new Capture(this, cameras[0]);
      cam2 = new Capture(this, cameras[12]);
      //metodo para comenzar las camaras
      cam1.start();
      cam2.start();
      //carga de pixeles
      loadPixels();
      cam1.loadPixels();
      cam2.loadPixels();
    }

    //el trehold de la cam2 se controlacon el mouse dragged
    void mouseDragged() {
      treshold2 = map(mouseX, 0, width, 0, 255);
      treshold1 = map(mouseY, 0, width, 0, 255);
    }


    void draw() {
      if (cam1.available() == true) {
        cam1.read();
      }

      if (cam2.available() == true) {
        cam2.read();
      }

      //println(cam1.width,cam1.height);
      //recorrer los pixeles de las camaras
      for (int y = 0; y<cam2.width; y++)
      {
        for (int x = 0; x<cam1.height; x++)
        {      
          //buscapixeles
          int loc = x+y*cam1.height;
          //banderas de brillo
          int loc1 = 0;
          int loc2 = 0;
          //medidores de brillo para cada camara
          float bright1 = brightness(cam1.pixels[loc]);
          float bright2 = brightness(cam2.pixels[loc]);

          if (bright1>treshold1)
          {
            loc1 = 1;
          }

          if (bright2>treshold2)
          {
            loc2 = 1;
          }

          if (loc1 == 1 && loc2 == 0)
          {
            pixels[loc] = color1;
          }

          if (`loc2==1 && loc1==0)
          {
            pixels[loc] = color2;
          }

          if (loc1 == 1 && loc2==1) {
            pixels[loc] = color1+color2;
          }

          if (loc1 == 0 && loc2==0) {
            pixels[loc] = fondo;
          }
        }
      }
      updatePixels();
    }

    void mousePressed() {
      for (int i = 0; i<suma; i++) {
        saveFrame("data/pruebas"+i+".jpg");
      }
      suma++;
    }

this is the code, its a video sinthetizer trying to bea replica of the paik-abe sinthethizer

kfrajer

Please describe the problem you are having currently. Do you get an error? You get nothing? Also try implementing the algorithm as described in the link from earlier post as they were tested. Before try to work with brightness calculations, just focus in displaying the images in the canvas. Remove code that is not needed for this part of the troubleshooting. Can we assume the cameras work if run one by one by themselves?

Kf

koogs

There's an obvious error in line 90

koogs

Lines 62 and 64 are confusing. And 67.

Outer loop should be y and height, inner loop should be x and width. Index is x + (y * width). Yours might be equivalent but the above is clearer.

Line 108 is nonsense. You don't need a loop.

koogs

treshold1 = map(mouseY, 0, width, 0, 255);

why are you mapping mouseY with width?

for (int y = 0; y<cam2.width; y++) { for (int x = 0; x<cam1.height; x++)

cam2.width but cam1.height? you will have no end of problems if the cameras are different sizes.