problem full screen with color tracking and webcam

pietrondo

Hi! I have a big question, I'm trying to go to full screen with a simple colortracking game but my webcam doesn't support the resolution of my monitor. (I'm playing with Shiffman code).

How can I do? I have tried with image to resize the output but after how Can i "take" (I'm not english native speaker) the right pixel of the output to use for the color traking (and not the pixel of the low-res camera)?

thx

Lord_of_the_Galaxy

What code are you using? Please post.

pietrondo

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

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

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

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

pietrondo

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

pietrondo

(i have updated the code)