cam

// Step 1. Import the video library
import processing.video.*;

// Step 2. Declare a Capture object
Capture cam;

//Step 2b. Declare a PImage to hold the mirrored web cam image
PImage img;

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

  // Step 3. Initialize Capture object via Constructor
  cam = new Capture(this, width, height);
  cam.start();

  // Step 3b. Initialize 'mirror' image
  img = createImage(width, height, RGB);

}

// An event for when a new frame is available
void captureEvent(Capture cam) {
  // Step 4. Read the image from the camera.
  cam.read();
}
void draw() {
  // Step 4b. flip the image so it mirrors the users
  flipImage();
  // Step 5. Draw the (flipped) image.
  image(img,0,0);
}

void flipImage() {
  img = createImage(width, height, RGB);
  img.loadPixels();
  cam.loadPixels();
  for (int y = 0; y<height; y++) {
    for (int x = 0; x<width; x++) {
      img.pixels[y*width+x] = cam.pixels[y*width+(width-1-x)];
    }
  }
  img.updatePixels();
}