July 20th

Have started experimenting with the Histogram class for comparing bitmaps.

Using http://www.as3apex.com/uncategorized/flash-10s-bitmapdatahistogram-is-really-slow/and http://books.google.com/books?id=xm9COWxqfIkC&pg=PT233&dq=histogram+flash+actionscript&client=safari for guidence.

Today's code

import flash.display.Bitmap; 

import flash.display.BitmapData; 

var video:Video = new Video();

addChild(video);

 

var nc:NetConnection = new NetConnection();

nc.connect(null);

 

var ns:NetStream = new NetStream(nc);

ns.client = {};

ns.client.onMetaData = ns_onMetaData;

ns.client.onCuePoint = ns_onCuePoint;

ns.play("640x480.flv");

 

video.attachNetStream(ns);

 

function ns_onMetaData(item:Object):void {

    trace("metaData");

    // Resize video instance.

    video.width = item.width;

    video.height = item.height;

    // Center video instance on Stage.

    video.x = (stage.stageWidth - video.width) / 2;

    video.y = (stage.stageHeight - video.height) / 2;

}

function ns_onCuePoint(item:Object):void {

    trace("cuePoint");

    trace(item.name + "\t" + item.time);

}

//var snapshot : BitmapData; 

//snapshot = new BitmapData(myVideo.width,myVideo.height);  

//function takeSnapshot()  

//{  

  // snapshot.draw(myVideo);  

//}  

  

//call takeSnapshot every 100ms (0.1s)  

 

  

var now : BitmapData; 

var before: BitmapData;  

 

now = new BitmapData(video.width,video.height);  

//setInterval(this,"takeSnapshot",100);

//setInterval(this,"takeSnapshot",100); 

function takeSnapshot()  

{  

   now.draw(video);  

   // 1. capture 'now' 2. Do something 3. copy now to before   

   before=now.clone();  

 

var histogram(hRect:Rectangle=null):Vector.> = BitmapData.histogram;  

var oldC = before.histogram();

var newC = now.histogram();

if (oldC != newC) {  

   trace('Activity... in region');  

}

}

//function histogram(hRect:Rectangle = null):Vector