增加噪声的动作视频 [英] adding noise to a video in actionscript
问题描述
在我开始之前，我想道歉，如果有什么我要问的是被认为是超级新手的问题。
Before I begin, I would like to apologize if what I'm going to ask is to be considered as super newbie question.
所以，我尝试使用的ActionScript3创建一个简单的AR场景李布赖姆洛的教程。 （http://blog.theflashblog.com/?p=901） 它制定了pretty的同时，考虑到我从来没有创造出来的东西的Adobe的Flex Builder之前。 （我安装的Flex Builder之后我看到那些教程）
so I was trying out Lee Brimelow's tutorial on creating a simple AR scene using actionscript3. (http://blog.theflashblog.com/?p=901) It worked out pretty well, considering I have never created something out of Adobe Flex Builder before. (I installed Flex Builder right after I saw those tutorial)
下面是源$ C $ C
here is the source code
package {
import flash.display.BitmapData;
import flash.display.Sprite;
import flash.events.Event;
import flash.media.Camera;
import flash.media.Video;
import flash.utils.ByteArray;
import org.libspark.flartoolkit.core.FLARCode;
import org.libspark.flartoolkit.core.param.FLARParam;
import org.libspark.flartoolkit.core.raster.rgb.FLARRgbRaster_BitmapData;
import org.libspark.flartoolkit.core.transmat.FLARTransMatResult;
import org.libspark.flartoolkit.detector.FLARSingleMarkerDetector;
import org.libspark.flartoolkit.support.pv3d.FLARBaseNode;
import org.libspark.flartoolkit.support.pv3d.FLARCamera3D;
import org.papervision3d.lights.PointLight3D;
import org.papervision3d.materials.shadematerials.FlatShadeMaterial;
import org.papervision3d.materials.utils.MaterialsList;
import org.papervision3d.objects.primitives.Cube;
import org.papervision3d.render.BasicRenderEngine;
import org.papervision3d.scenes.Scene3D;
import org.papervision3d.view.Viewport3D;
[SWF(width="640", height="480", frameRate="30", backgroundColor="#FFFFFF")]
public class FLARdemo extends Sprite
{
[Embed(source="pat1.pat", mimeType="application/octet-stream")]
private var pattern:Class;
[Embed(source="camera_para.dat", mimeType="application/octet-stream")]
private var params:Class;
private var fparams:FLARParam;
private var mpattern:FLARCode;
private var vid:Video;
private var cam:Camera;
private var bmd:BitmapData;
private var raster:FLARRgbRaster_BitmapData;
private var detector:FLARSingleMarkerDetector;
private var scene:Scene3D;
private var camera:FLARCamera3D;
private var container:FLARBaseNode;
private var vp:Viewport3D;
private var bre:BasicRenderEngine;
private var trans:FLARTransMatResult;
public function FLARdemo()
{
setupFLAR();
setupCamera();
setupBitmap();
setupPV3D();
addEventListener(Event.ENTER_FRAME, loop);
}
private function setupFLAR():void
{
fparams = new FLARParam();
fparams.loadARParam(new params() as ByteArray);
mpattern = new FLARCode(16, 16);
mpattern.loadARPatt(new pattern());
}
private function setupCamera():void
{
vid = new Video(640, 480);
cam = Camera.getCamera();
cam.setMode(640, 480, 30);
vid.attachCamera(cam);
addChild(vid);
}
private function setupBitmap():void
{
bmd = new BitmapData(640, 480);
bmd.draw(vid);
raster = new FLARRgbRaster_BitmapData(bmd);
detector = new FLARSingleMarkerDetector(fparams, mpattern, 80);
}
private function setupPV3D():void
{
scene = new Scene3D();
camera = new FLARCamera3D(fparams);
container = new FLARBaseNode();
scene.addChild(container);
var pl:PointLight3D = new PointLight3D();
pl.x = 1000;
pl.y = 1000;
pl.z = -1000;
var ml:MaterialsList = new MaterialsList({all: new FlatShadeMaterial(pl)});
var Cube1:Cube = new Cube(ml, 30, 30, 30);
var Cube2:Cube = new Cube(ml, 30, 30, 30);
Cube2.z = 50
var Cube3:Cube = new Cube(ml, 30, 30, 30);
Cube3.z = 100
container.addChild(Cube1);
container.addChild(Cube2);
container.addChild(Cube3);
bre = new BasicRenderEngine();
trans = new FLARTransMatResult();
vp = new Viewport3D;
addChild(vp);
}
private function loop(e:Event):void
{
bmd.draw(vid);
try
{
if(detector.detectMarkerLite(raster, 80) && detector.getConfidence() > 0.5)
{
detector.getTransformMatrix(trans);
container.setTransformMatrix(trans);
bre.renderScene(scene, camera, vp);
}
}
catch(e:Error){}
}
}
}
我所问的是： 是我们有可能增加一些噪音，在最终视频输出？我试图找出PSNR分别增加噪音。 我可以做的噪声和视频之间的一些卷积？
what I am asking is : is it possible for us to add some noise in the final video output? I'm trying to find out the PSNR by adding noises respectively. can I do some convolution between the noise and the video?
哦，顺便说一句，我这样做，我在大学分配。我的教授要我解释完全FlarToolKit工作。 （详细信息，如矩阵推算，做迭代法等获得的错误。）
oh btw I'm doing this for my assignment in college. My prof wanted me to explain how exactly the FlarToolKit works. (details such as Matrix Projections, Obtaining Errors by doing Iterative Method, etc.)
感谢您。 Prama
Thank you. Prama
推荐答案
动态创建细粒度噪声的计算成本高昂，所以我产生低分辨率的噪音和将其放大。在项目中，单纯的addEventListener调用后添加位设置code，然后添加一行产生噪声的活动循环。
Creating fine-grained noise dynamically is computationally expensive, so I generate low-res noise and scale it up. In your project, simply add the bitmap setup code after the addEventListener call and then add the single line to generate the noise to your activity loop.
package
{
import flash.display.Bitmap;
import flash.display.BitmapData;
import flash.display.BlendMode;
import flash.display.Sprite;
import flash.events.Event;
import flash.geom.Matrix;
import flash.media.Camera;
import flash.media.Video;
import flash.utils.getTimer;
public class NoiseMain extends Sprite
{
protected static const VID_WIDTH : uint = 640;
protected static const VID_HEIGHT : uint = 480;
protected static const NOISE_SCALE_X : Number = 4;
protected static const NOISE_SCALE_Y : Number = 2;
protected var _vid : Video;
protected var _noise : BitmapData;
protected var _composite : BitmapData;
protected var _matrix : Matrix;
public function NoiseMain()
{
// We're creating a webcam outlet, but not adding it to the stage since we want to post-process the image.
_vid = new Video(VID_WIDTH, VID_HEIGHT);
var cam : Camera = Camera.getCamera();
cam.setMode(VID_WIDTH, VID_HEIGHT, 30);
_vid.attachCamera(cam);
var w : uint = Math.ceil(VID_WIDTH / NOISE_SCALE_X);
var h : uint = Math.ceil(VID_HEIGHT / NOISE_SCALE_Y);
_noise = new BitmapData(w, h, false, 0xFFFFFF);
_composite = new BitmapData(VID_WIDTH, VID_HEIGHT, false, 0x000000);
var bmp : Bitmap = new Bitmap(_composite);
addChild(bmp);
_matrix = new Matrix(NOISE_SCALE_X, 0, 0, NOISE_SCALE_Y);
stage.addEventListener(Event.ENTER_FRAME, enterFrameHandler);
}
protected function enterFrameHandler(evt : Event) : void
{
_noise.noise(getTimer(), 204, 255, 7, true);
_composite.lock();
_composite.draw(_vid);
_composite.draw(_noise, _matrix, null, BlendMode.MULTIPLY);
_composite.unlock();
}
}
}
编辑：我已经修改后的我的例子更符合你想要做的事。你可以调整噪音刻度常数改变质感的噪音以及与噪声（第2和第3个参数的噪声（）方法）的强度和噪声的改变则blendMode的视觉外观搞乱在第2个平局（）调用）。
I've revised my example to be more in line with what you're trying to do. You can tweak the noise scale constants to change the "texture" of the noise as well as messing with the strength of the noise (the 2nd and 3rd arguments to the noise() method) and the visual appearance of the noise by changing the BlendMode in the 2nd draw() call).
这篇关于增加噪声的动作视频的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
