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源码：

package
{
    import flash.display.Bitmap;
    import flash.display.BitmapData;
    import flash.display.DisplayObjectContainer;
    import flash.display.Loader;
    import flash.display.Sprite;
    import flash.events.Event;
    import flash.events.MouseEvent;
    import flash.geom.Rectangle;
    import flash.net.FileReference;
    import flash.text.TextField;
    import flash.text.TextFieldAutoSize;
    import flash.text.TextFormat;

    /**
     * 分析图片生成文本表现形式
     * @author:Frost.Yen
     * @E-mail:871979853@qq.com
     * @create:    2016-6-28 下午12:25:01
     *
     */
    [SWF(width="1920",height="1080")]
    public class ImageToText extends Sprite
    {
        private var _charArr:Array = [];
        private var _text:TextField;
        private var _file:FileReference;
        private var _ldr:Loader;
        public function ImageToText()
        {
            _text = new TextField;
            var tfm:TextFormat = new TextFormat;
            tfm.size = 8;
            //tfm.leading = -2;
            _text.defaultTextFormat = tfm;
            _text.autoSize = TextFieldAutoSize.LEFT;
            var text:String = " ";
            var min:int = 32;
            var max:int = 120;
            while (++min < max) {
                var c:String = String.fromCharCode(min);
                text += c;
            }
            text += "           .'*#@%+-)(TiI?><~";
            for (var i:int = 0; i < text.length;i++ ) {
                c = text.charAt(i);
                _charArr.push({d:getDensity(c),t:c});
            }
            _charArr.sortOn("d", Array.NUMERIC|Array.DESCENDING);
            addChild(_text);

             var btn:TextField = getTextButton(this,"浏览图片",10,1000,100,30);
            btn.addEventListener(MouseEvent.CLICK,browse);
            _ldr = new Loader();
            _ldr.contentLoaderInfo.addEventListener(Event.COMPLETE, onLoad2);
        }
        public function getTextButton(parent:DisplayObjectContainer,text:String,x:Number,y:Number,width:Number,height:Number):TextField
        {
            var button:TextField = new TextField();
            button.autoSize = "center";
            button.width = width;
            button.height = height;
            button.selectable = false;
            button.border = true;
            button.htmlText = "<a href='event:#'>"+text+"</a>";
            button.x = x;
            button.y = y;
            parent.addChild(button);
            return button;

        }
        /**
         * 根据图像渲染生成文字效果
         * @param bmd 图像
         * @return
         */
        private function render(bmd:BitmapData):void {
            _text.width = bmd.width;
            _text.height = bmd.height;
            var x:int = 0;
            var y:int = 0;
            _text.text = "";
            while (y < bmd.height) {
                while (x<bmd.width) {
                    var gray:Number = getGray(bmd.getPixel(x, y)) / 0xff;
                    var index:int = int((_charArr.length - 1) * gray);
                    _text.appendText(_charArr[index].t);
                    var r:Rectangle = _text.getCharBoundaries(_text.text.length - 1);
                    x = r.right;
                }
                _text.appendText("\n");
                y = r.bottom;
                x = 0;
            }
        }
        /**
         * 获取文字的明暗值
         * @param t 文字
         * @return Number
         */
        private function getDensity(t:String):Number {
            var ttf:TextField = new TextField;
            ttf.autoSize = TextFieldAutoSize.LEFT;
            ttf.text = t;

            var bmd:BitmapData = new BitmapData(ttf.width, ttf.height, false, 0xffffff);
            bmd.draw(ttf);
            var c:int = 0;
            for (var x:int = 0; x < bmd.width;x++ ) {
                for (var y:int = 0; y < bmd.height;y++ ) {
                    if (bmd.getPixel(x,y)!=0xffffff) {
                        c++;
                    }
                }
            }
            return c / ttf.width / ttf.height;
        }

        private function getR(color:uint):uint {
            return color << 8 >>> 24;
        }
        private function getG(color:uint):uint {
            return color << 16 >>> 24;
        }
        private function getB(color:uint):uint {
            return color << 24 >>> 24;
        }
        /**
         * 获取像素点的灰度
         * @color 像素点的颜色值
         * @return uint
         */
        private function getGray(color:uint):uint {
            return getR(color) * 0.299 + getG(color) * 0.587 + getB(color) * 0.114;
        }

        private function browse(e:Event):void {
            _file = new FileReference();
            _file.browse();
            _file.addEventListener(Event.SELECT, onSelect);
        }

        private function onSelect(e:Event):void {
            _file.load();
            _file.addEventListener(Event.COMPLETE, onLoad);

        }

        private function onLoad(e:Event):void {

            _ldr.loadBytes(_file.data);

        }

        private function onLoad2(e:Event):void {
            var content:Bitmap = e.target.content as Bitmap;
            content.x = content.width+100;
            stage.addChild(content);
            render(content.bitmapData.clone());
        }
    }
}