java图像处理之倒角距离变换

package com.gloomyfish.image.transform; 
 
import java.awt.Color; 
import java.awt.image.BufferedImage; 
import java.util.Arrays; 
 
import com.gloomyfish.filter.study.AbstractBufferedImageOp; 
 
public class CDTFilter extends AbstractBufferedImageOp { 
  private float[] dis; // nn-distances 
  private int[] pos; // nn-positions, 32 bit index 
  private Color bakcgroundColor; 
   
  public CDTFilter(Color bgColor) 
  { 
    this.bakcgroundColor = bgColor; 
  } 
 
  @Override 
  public BufferedImage filter(BufferedImage src, BufferedImage dest) { 
    int width = src.getWidth(); 
    int height = src.getHeight(); 
 
    if (dest == null) 
      dest = createCompatibleDestImage(src, null); 
 
    int[] inPixels = new int[width * height]; 
    pos = new int[width * height]; 
    dis = new float[width * height]; 
    src.getRGB(0, 0, width, height, inPixels, 0, width); 
    // 随机生成距离变换点 
    int index = 0; 
    Arrays.fill(dis, Float.MAX_VALUE); 
    int numOfFC = 0; 
    for (int row = 0; row  L->R, T-B 
    for (rows = 1; rows  R->L, B-T 
    // exactly same as first pass, just in the reverse direction 
    for (rows = height - 2; rows >= 1; rows--) { 
      for (cols = width - 2; cols >= 1; cols--) { 
        i = rows * width + cols; 
 
        nd = dis[i]; 
        nearestPixel = pos[i]; 
        if (nd != 0) { 
          in = i; 
 
          in += +1; // 4 
          if ((nd_tmp = d1 + dis[in])  255 &＃63; 255 : (i <0 &＃63; 0 : i); 
  } 
 
}