Background removal

import processing.video.*; // Variable for capture device Capture video; // Saved background PImage backgroundImage; // How different must a pixel be to be a foreground pixel float threshold = 20; void setup() { size(320, 240); video = new Capture(this, width, height, 30); // Create an empty image the same size as the video backgroundImage = createImage(video.width, video.height, RGB); } void draw() { // Capture video if (video.available()) { video.read(); } loadPixels(); video.loadPixels(); backgroundImage.loadPixels();

image(video, 0, 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; // Step 1, what is the 1D pixel location color fgColor = video.pixels[loc]; // Step 2, what is the foreground color // Step 3, what is the background color color bgColor = backgroundImage.pixels[loc]; // Step 4, compare the foreground and background color float r1 = red(fgColor); float g1 = green(fgColor); float b1 = blue(fgColor); float r2 = red(bgColor); float g2 = green(bgColor); float b2 = blue(bgColor); float diff = dist(r1, g1, b1, r2, g2, b2); // Step 5, Is the foreground color different from the background color if (diff > threshold) { // If so, display the foreground color pixels[loc] = fgColor; } else { // If not, display green pixels[loc] = color(0, 255, 0); } } } updatePixels(); } void mousePressed() { // Copying the current frame of video into the backgroundImage object // Note copy takes 5 arguments: // The source image // x,y,width, and height of region to be copied from the source // x,y,width, and height of copy destination backgroundImage.copy(video, 0, 0, video.width, video.height, 0, 0, video.width, video. height); backgroundImage.updatePixels(); }

I try to run it but the output only show the green screen.