problem full screen with color tracking and webcam

Answers

• Lord_of_the_Galaxy

  February 2017

  What code are you using? Please post.
• pietrondo

  February 2017 edited February 2017

  I have take the code of Shiffman

  import processing.video.*;
  
  // Variable for capture device
  Capture video;
  PImage img;
  PImage img1;
  
  // A variable for the color we are searching for.
  color trackColor; 
  
  // A Snake variable
  Snake snake;
  
  void setup() {
    size(1280,720);
    video = new Capture(this,width,height);
    video.start();
    // Start off tracking for red
    trackColor = color(172,107,72);
    img =loadImage("gatto.jpg");
      img1 =loadImage("cane.jpg");
  
    // Initialize the snake
    snake = new Snake(50);
    
  }
  `
  
  `
  // New frame available from camera
  void captureEvent(Capture video) {
    video.read();
  }
  
  void draw() {
    video.loadPixels();
    image(video,0,0);
  
    // Before we begin searching, the "world record" for closest color is set to a high number that is easy for the first pixel to beat.
    float worldRecord = 800; 
  
    // XY coordinate of closest color
    int closestX = 0;
    int closestY = 0;
  
    // Begin loop to walk through every pixel
    for (int x = 0; x < video.width; x ++ ) {
      for (int y = 0; y < video.height; y ++ ) {
        int loc = x + y*video.width;
        // What is current color
        color currentColor = video.pixels[loc];
        float r1 = red(currentColor);
        float g1 = green(currentColor);
        float b1 = blue(currentColor);
        float r2 = red(trackColor);
        float g2 = green(trackColor);
        float b2 = blue(trackColor);
  
        // Using euclidean distance to compare colors
        float d = dist(r1,g1,b1,r2,g2,b2); // We are using the dist( ) function to compare the current color with the color we are tracking.
  
        // If current color is more similar to tracked color than
        // closest color, save current location and current difference
        if (d < worldRecord) {
          worldRecord = d;
          closestX = x;
          closestY = y;
        }
      }
    }
  `
    
  `// We only consider the color found if its color distance is less than 10. 
    // This threshold of 10 is arbitrary and you can adjust this number depending on how accurate you require the tracking to be.
    if (worldRecord < 10) { 
      // Update the snake's location
      snake.update(closestX,closestY);
    }
    
    snake.display();
  
  }
  
  
  
  void mousePressed() {
    // Save color where the mouse is clicked in trackColor variable
    int loc = mouseX + mouseY*video.width;
    trackColor = video.pixels[loc];
    print(red(trackColor),"\n");
      print(green(trackColor),"\n");
  
    print(blue(trackColor),"\n");
  
  }
  class Snake {
    // x and y positions
    int[] xpos;
    int[] ypos;
  
    // The constructor determines the length of the snake
    Snake(int n) {
      xpos = new int[n];
      ypos = new int[n];
    }
  
    void update(int newX, int newY) {
      // Shift all elements down one spot. 
      // xpos[0] = xpos[1], xpos[1] = xpos = [2], and so on. Stop at the second to last element.
      for (int i = 0; i < xpos.length-1; i ++ ) {
        xpos[i] = xpos[i+1]; 
        ypos[i] = ypos[i+1];
      }
  
      // Update the last spot in the array with the mouse location.
      xpos[xpos.length-1] = newX; 
      ypos[ypos.length-1] = newY;
    }
  
    void display() {
      // Draw everything
      for (int i = 0; i < xpos.length; i ++ ) {
        // Draw an ellipse for each element in the arrays. 
        // Color and size are tied to the loop's counter: i.
        stroke(0);
        fill(255-i*5);
        ellipse(xpos[i],ypos[i],i,i); 
      }
  
    }
  
  }
  

  `
• Lord_of_the_Galaxy

  February 2017

  I think you missed some lines here. But I get what code you're talking about. It would still be better if you post your try at making it work.
• pietrondo

  February 2017 edited February 2017

  yep. it missed the snake class:

  class Snake {
    // x and y positions
    int[] xpos;
    int[] ypos;
  
    // The constructor determines the length of the snake
    Snake(int n) {
      xpos = new int[n];
      ypos = new int[n];
    }
  
    void update(int newX, int newY) {
      // Shift all elements down one spot. 
      // xpos[0] = xpos[1], xpos[1] = xpos = [2], and so on. Stop at the second to last element.
      for (int i = 0; i < xpos.length-1; i ++ ) {
        xpos[i] = xpos[i+1]; 
        ypos[i] = ypos[i+1];
      }
  
      // Update the last spot in the array with the mouse location.
      xpos[xpos.length-1] = newX; 
      ypos[ypos.length-1] = newY;
    }
  
    void display() {
      // Draw everything
      for (int i = 0; i < xpos.length; i ++ ) {
        // Draw an ellipse for each element in the arrays. 
        // Color and size are tied to the loop's counter: i.
        stroke(0);
        fill(#098156);
        ellipse(xpos[i],ypos[i],i,i); 
      }
  
    }
  
  }
  
• Lord_of_the_Galaxy

  February 2017

  I also meant the last line (#86). It is clearly incomplete.
• pietrondo

  February 2017

  ohh some strange problem. I have removed some lines now `
• pietrondo

  February 2017

  (i have updated the code)