動体検知のテスト

/**
 * Copyright atsonic ( http://wonderfl.net/user/atsonic )
 * MIT License ( http://www.opensource.org/licenses/mit-license.php )
 * Downloaded from: http://wonderfl.net/c/kbsI
 */

package
{
	import flash.display.Sprite;
	import flash.display.Bitmap;
	import flash.display.BitmapData;
	import flash.display.BlendMode;
	import flash.events.Event;
	import flash.geom.Point;
	import flash.geom.Rectangle;
	import flash.geom.ColorTransform;
	import flash.geom.Matrix;
	import flash.media.Camera;
	import flash.media.Video;
	import flash.filters.ConvolutionFilter;
	/**
	 * 動体検知のテスト。
	 * 精度は微妙。
	 * @author atsonic
	 */
	public class FlashTest extends Sprite
	{
		private var cameraW:uint;
		private var cameraH:uint;
		private var _camera:Camera;
		private var _video:Video;
		private var _bmp:Bitmap;
		private var _bmd:BitmapData;
		private var _rect:Rectangle;
		private var _point:Point;
		private var _type:String;
		private var _typeArray:Array;
		private var _now:BitmapData;
		private var _old:BitmapData;
		private var _square:Sprite;
		private var _convolutionFilter:ConvolutionFilter;
		/**
		 * constructor
		 */
		public function FlashTest ()
		{
			cameraW = 465;
			cameraH = 465;
			_rect = new Rectangle(0, 0, cameraW, cameraH);
			_point = new Point(0, 0);
			_type = "normal";
			
			_camera = Camera.getCamera();
			if (_camera != null)
			{
				stage.addEventListener(Event.ENTER_FRAME, enterFrameHandler);
				_camera.setMode(cameraW / 2, cameraH / 2, 30);
				_video = new Video(cameraW, cameraH);
				_video.attachCamera(_camera);
			}
			else
			{
				trace("You need a camera.");
			}
			var array:Array = [1,  1,  1,
				           1,  16,  1,
					   1,  1,  1];
			_convolutionFilter = new ConvolutionFilter(3, 3, array);
			_convolutionFilter.bias = -(0x1000 + 0x100 * 6);

			_bmd = new BitmapData(cameraW, cameraH , false, 0xFFFFFF);
			_bmp = new Bitmap(_bmd);
			_bmp.x = (stage.stageWidth - cameraW) / 2;
			_bmp.y = (stage.stageHeight - cameraH) / 2;
			//_bmp.alpha = 0.8;
			addChild(_video);
			addChild(_bmp);
			_square = new Sprite();
			addChild(_square);
			_now = new BitmapData(cameraW, cameraH);
			_old = new BitmapData(cameraW, cameraH);
		}
		/**
		 * enterFrameHandler
		 * @param event Event
		 */
		private function enterFrameHandler(event:Event):void
		{
			if (_video == null || _camera == null)
			{
				return;
			}
			if (_camera.muted == true)
			{
				return;
			}
			_now.draw(_video);
			_now.draw(_old, new Matrix(), new ColorTransform(), BlendMode.DIFFERENCE);
			_now.threshold(_now, _rect, _point, ">", 0xff111111, 0xffffffff);
			_now.applyFilter(_now, _rect, _point, _convolutionFilter);
			_old.draw(_video);
			
			_bmd.lock();
			_bmd.copyPixels(_now, _rect, _point);
			_bmd.unlock();
			/*
			var rect:Rectangle = _bmd.getColorBoundsRect( 0xFFFFFFFF, 0xFFFFFFFF, true );
			_square.graphics.clear();
			_square.graphics.lineStyle(1, 0xFF0000);
			_square.graphics.drawRect(rect.x, rect.y, rect.width, rect.height);
			*/
                        
		}
	}
}