Code

float noiseScale = 0.003;

PImage image1;
PImage image2;
PImage image3;

int iteration;

void setup()
{
  size(960, 540);
  image1 = loadImage("image1.png");
  image2 = loadImage("image2.png");
  image3 = loadImage("image3.png");
  iteration = 0;

  noiseSeed(10);
}

void draw()
{
  loadPixels();

  for(int i = 0; i < width; i++)
  {
    for(int j = 0; j < height; j++)
    {

      float noiseValue1 = noise(i * noiseScale,j * noiseScale, iteration * 0.01);
      if(noiseValue1 < 0.46)
        pixels[i + j * width] = image1.pixels[i + j * width];
      if(noiseValue1 >= 0.46 && noiseValue1 < 0.55)
        pixels[i + j * width] = image2.pixels[i + j * width];
      if(noiseValue1 >= 0.55)
        pixels[i + j * width] = image3.pixels[i + j * width];
    }
  }
  updatePixels();
  iteration++;
  if(iteration < 900)
  {
    saveFrame("frames/frame-####.tif");
  }
}