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UMV
,→Visual Concept
View video 'Flow'.
==Documentation==
* Source Code:
-coding consists of initialization of camera, bitmap manipulating to create motion-detecting/color/background editing effects, and some animating code.
-camera code and motion detecting code is adapted from [[http://drawlogic.com/2007/10/17/motion-detection-in-flash-as2-and-as3-and-c/]], with some changes for color and background editing effects.
CAMERA:
-sets up webcam and shows security panel
import flash.media.Camera;
import flash.system.Security;
import flash.system.SecurityPanel;
import flash.events.*;
var cam:Camera = Camera.getCamera();
if(cam != null){
cam.setMode(video1.width, video1.height, 12, true);
video1.attachCamera(cam);
cam.addEventListener(ActivityEvent.ACTIVITY, activityHandler);
}else{
Security.showSettings(SecurityPanel.CAMERA)
}
var inited:Boolean=false;
function activityHandler(event:ActivityEvent):void {
if(cam.muted){
Security.showSettings(SecurityPanel.CAMERA)
}else if(!inited){
initialize();
inited=true;
}
//trace("activityHandler: " + event);
}
BITMAP:
import flash.display.Bitmap;
import flash.display.BitmapData;
import flash.geom.Matrix;
import flash.utils.Timer;
import flash.events.TimerEvent;
var now:BitmapData;
var out:BitmapData;
var before:BitmapData;
var bitmap:Bitmap;
var timer:Timer;
var m:Matrix;
var max:int = 7;
function initialize(){
//create an array that will be the fading image cue
list=new Array()
//create an identity matrix
m=new Matrix()
//scale the transformation matrix to match the scale of the Video object on stage
m.scale((video1.scaleX),(video1.scaleY))
//create a bitmap object in memory that is the same size as the Video object on stage
now=new BitmapData(video1.width, video1.height, true, 0x00000000);
//create a bitmap object in memory to hold a layered bitmap from the fading image cue
out=new BitmapData(video1.width, video1.height, true, 0x00000000);
//out.draw(video1,m);
before = out.clone();
bitmap=new Bitmap();
//create a bitmap to display the bitmapdata
this.addChild(bitmap);
//position it to the right of the live Webcam feed
//bitmap.x=video1.x+video1.width;
bitmap.x=video1.x;
bitmap.y=video1.y;
//call the snap function every 1/10th of a second
timer = new Timer(100);
timer.addEventListener(TimerEvent.TIMER, snap);
timer.start();
}
//capture a freezeframe from the webcam and copy it, called regularly do detect movement
function snap(event:TimerEvent){
bitmap.bitmapData=out;
//draw the video into the bitmapdata object object with the scaled transformation matrix
now.draw(video1,m)
//copy the current freezeframe
done=now.clone()
//now draw the previous freezeframe ("BEFORE"!) on top of the current frameframe and apply the 'difference' blendmode
done.draw(before,m,null,"difference")
//filter out all pixels in the differenced bitmap that are greater than just over black (0xFF111111) and make them green (0xFF00FF00)
//over-write the previous contents of the bitmap
done.threshold(done,done.rect,done.rect.topLeft,">",0xFF707070,0xFF00FF00,0xFFFFFFFF,true) //important line, used to set threshold of colors and change background to black while movement/people to green
//add the finished bitmap to a fading image cue
list.push(done.clone())
//if the cue is now greater than the maximum length we specified
if(list.length > max)
{
//then remove the bitmap at the very front of the cue
//and free the memory it was using
list.shift().dispose()
}
//how many items in the fading cue
var l=list.length
//how much should the green channel deteriate on each degradation
var each=255/l
//declare local var to speed up the loop
var g
//var changed:uint
//clear the out bitmap object so we can start a fresh
out.fillRect(out.rect,0xFF000000)
//copy the current bitmap and save it for the next time this function is called
before=now.clone()
//loop through each bitmap in the fading image cue
for(var i=0;i<l;++i)
{
//determine the current degradation
g=each*i
out.threshold(list[i], out.rect, out.rect.topLeft, "<=", 0xFF707070, 0x00000000, 0xFF000000, true);
//this line was added to make unimportant pixels transparent - used for background changing
//copy all the pixels that are green in the current item in the fading image cue and make them into the degradated green color
//add those pixels on top of the bitmap that will displayed to the user
out.threshold(list[i],out.rect,out.rect.topLeft,"==",0xFF00FF00,(255<<24 | 0<<16 | g<<8 | 0),0x00FFFFFF,false)
}
