[AS3][写経]エッジ解析

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

    package
    {
        // 写経元に感謝
        // http://www.oreilly.co.jp/books/9784873114378/
        
        import flash.display.Bitmap;
        import flash.display.BitmapData;
        import flash.display.Sprite;
        import flash.display.StageAlign;
        import flash.display.StageScaleMode;
        import flash.events.Event;
        import flash.filters.BlurFilter;
        import flash.filters.ConvolutionFilter;
        import flash.geom.Matrix;
        import flash.media.Camera;
        import flash.media.Video;     

        public class Shakyo5_3_3_4 extends Sprite {
            private var _cam:Camera;
            private var _vid:Video;
            private var _bmpd:BitmapData;

            public function Shakyo5_3_3_4() {
                stage.align = StageAlign.TOP_LEFT;
                stage.scaleMode = StageScaleMode.NO_SCALE;         

                _cam = Camera.getCamera();
                _cam.setMode(320, 240, 15);

                _vid = new Video(320, 240);
                _vid.attachCamera(_cam);
                _vid.filters = [new ConvolutionFilter(1, 3, [0, 4, -4]), new BlurFilter()];  

                _bmpd = new BitmapData(320, 240, false);
                addChild(new Bitmap(_bmpd));       

                addEventListener(Event.ENTER_FRAME, onEnterFrame);
            }

           

            private function onEnterFrame(e:Event):void {
                _bmpd.draw(_vid, new Matrix(-1, 0, 0, 1, _bmpd.width, 0));
            }

        }

    }