Jitter Filter

昨日に引き続き画像処理手法の簡単な紹介。

このフィルタは画素値を周りに拡散させます。
Photoshopの [フィルタ] > [表現技法] > [拡散]と同じ効果です。
実際の処理は参照する座標値をランダムに決めているだけ。

・ソースコード

package	 {
	import __AS3__.vec.Vector;
	
	import flash.display.*;
	
	[SWF(width = "600", height = "250", backgroundColor = "#000000", frameRate = "30")]
	
	public class Jitter extends Sprite{
		[Embed(source = 'assets/picture.jpg')]
		public var SrcImg:Class;
		
		private var src:Bitmap;
		private var dst:Bitmap;
		private var srcData:Vector.<uint>;
		private var w:int;
		private var h:int;
		
		public function Jitter() {
			stage.scaleMode = "noScale";
			src = new SrcImg() as Bitmap;
			w = src.width;
			h = src.height;
			dst = new Bitmap(new BitmapData(w, h, false));
			addChild(src);
			srcData = new Vector.<uint>(w*h, true);
			srcData = src.bitmapData.getVector(src.bitmapData.rect);
			dst.bitmapData.setVector(dst.bitmapData.rect, filterJitter(srcData, 10));
			addChild(dst).x += w;
		}
		private function filterJitter(src:Vector.<uint>, amount:int):Vector.<uint> {
			var dst:Vector.<uint> = new Vector.<uint>(w*h, true);
			var nx:int, ny:int;
			for (var y:int=0;y<h;y++) {
				for (var x:int=0;x<w;x++) {
					nx = x + (Math.random() - 0.5)*amount;
					ny = y + (Math.random() - 0.5)*amount;
					try {
						dst[w*y + x] = src[w*ny + nx];
					}catch(e:RangeError) {
						dst[w*y + x] = src[w*y + x];
					}catch(e:ReferenceError) {
						dst[w*y + x] = src[w*y + x];
					}
				}
			}
			return dst;
		}
	}
}

package {

import __AS3__.vec.Vector;

import flash.display.*;

[SWF(width = "600", height = "250", backgroundColor = "#000000", frameRate = "30")]

public class Jitter extends Sprite{

[Embed(source = 'assets/picture.jpg')]

public var SrcImg:Class;

private var src:Bitmap;

private var dst:Bitmap;

private var srcData:Vector.<uint>;

private var w:int;

private var h:int;

public function Jitter() {

stage.scaleMode = "noScale";

src = new SrcImg() as Bitmap;

w = src.width;

h = src.height;

dst = new Bitmap(new BitmapData(w, h, false));

addChild(src);

srcData = new Vector.<uint>(w*h, true);

srcData = src.bitmapData.getVector(src.bitmapData.rect);

dst.bitmapData.setVector(dst.bitmapData.rect, filterJitter(srcData, 10));

addChild(dst).x += w;

}

private function filterJitter(src:Vector.<uint>, amount:int):Vector.<uint> {

var dst:Vector.<uint> = new Vector.<uint>(w*h, true);

var nx:int, ny:int;

for (var y:int=0;y<h;y++) {

for (var x:int=0;x<w;x++) {

nx = x + (Math.random() - 0.5)*amount;

ny = y + (Math.random() - 0.5)*amount;

try {

dst[w*y + x] = src[w*ny + nx];

}catch(e:RangeError) {

dst[w*y + x] = src[w*y + x];

}catch(e:ReferenceError) {

dst[w*y + x] = src[w*y + x];

}

return dst;

}

・関連記事
Symmetric Nearest Neighbour

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