Lively Dots

Lively dots is an interactive work that is based on camera input. Movement is detected to control an image, the image is not shown until something moves.

Interaction

mouse pressed can pause the video
key: s stands for save the picture
key: a stands for add the number of the balls
key: m stands for minus the number of the balls

Camera

Use library

import JMyron.*;
JMyron m;   //a camera object

Camera Settings

void drawCamera() {
  //get the normal image of the camera
  int[] img = m.differenceImage(); 
  loadPixels();
  //loop through all the pixels
  for (int i=0;i<width*height;i++) { 
    //draw each pixel to the screen 
    pixels[i] = img[i];
  }
  updatePixels();
}

Dots

Initial value

float objx = 320;
float objy = 240;
float objdestx = 320;
float objdesty = 240;

int numBalls = 25600;
float maxVelocity = 16; 
minAccel = 0.8; 
maxAccel = 1.8;

Location of the dots

if (!(avX==0&&avY==0)&&centers.length>0) {
  objdestx = avX;
  objdesty = avY;
}
objx += (objdestx-objx)/10.0f;
objy += (objdesty-objy)/10.0f;
for (int i=0; i<numBalls; i++) {
  ball[i].seek(new PVector(objx, objy));
  ball[i].render();

PROGRAM

File:Processing einfuehrung jin.zip