高斯模糊的Java实现

1、http://jhlabs.com/ip/index.html

java;gutter:true; public static byte[] blur(byte[] data) throws IOException { ByteArrayInputStream bais = new ByteArrayInputStream(data); BufferedImage img = ImageIO.read(bais); GaussianFilter gaussianFilter = new GaussianFilter(); gaussianFilter.filter(img, img); ByteArrayOutputStream baos = new ByteArrayOutputStream(); ImageIO.write(img, "jpg", baos); return baos.toByteArray(); }</p> <pre><code> Maven地址：http://mvnrepository.com/artifact/com.jhlabs/filters 除了高斯模糊，这人还写了好多图片处理的filter，参见：http://jhlabs.com/ip/filters/index.html 2、别人写的一个类，也很赞 ;gutter:true;
package com.extr.util;

import javax.imageio.ImageIO;
import java.awt.*;
import java.awt.image.BufferedImage;
import java.awt.image.PixelGrabber;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;

public class GaussianBlurUtil {

public static byte[] blur(byte[] data) throws IOException {
ByteArrayInputStream bais = new ByteArrayInputStream(data);
BufferedImage img = ImageIO.read(bais);
img = blur(img, 50);
ByteArrayOutputStream baos = new ByteArrayOutputStream();
ImageIO.write(img, "jpg", baos);
return baos.toByteArray();
}

/**
* 模糊执行方法
*
* @param img 原图片
* @param radius 模糊权重
* @return 模糊后图片
*/
public static BufferedImage blur(BufferedImage img, int radius) throws IOException {
int height = img.getHeight();
int width = img.getWidth();
int[] values = getPixArray(img, width, height);
values = doBlur(values, width, height, radius);
img.setRGB(0, 0, width, height, values, 0, width);
return img;
}

/**
* 获取图像像素矩阵
*
* @param im
* @param w
* @param h
* @return
*/
private static int[] getPixArray(Image im, int w, int h) {
int[] pix = new int[w * h];
PixelGrabber pg = null;
try {
pg = new PixelGrabber(im, 0, 0, w, h, pix, 0, w);
if (pg.grabPixels() != true)
try {
throw new java.awt.AWTException("pg error" + pg.status());
} catch (Exception eq) {
eq.printStackTrace();
}
} catch (Exception ex) {
ex.printStackTrace();
}
return pix;
}

/**
* 高斯模糊算法。
*
* @param pix
* @param w
* @param h
* @param radius
* @return
*/
public static int[] doBlur(int[] pix, int w, int h, int radius) throws IOException {
int wm = w – 1;
int hm = h – 1;
int wh = w * h;
int div = radius + radius + 1;
int r[] = new int[wh];
int g[] = new int[wh];
int b[] = new int[wh];
int rsum, gsum, bsum, x, y, i, p, yp, yi, yw;
int vmin[] = new int[Math.max(w, h)];
int divsum = (div + 1) >> 1;
divsum *= divsum;
int dv[] = new int[256 * divsum];
for (i = 0; i < 256 * divsum; i++) {
dv[i] = (i / divsum);
}
yw = yi = 0;
int[][] stack = new int[div][3];
int stackpointer;
int stackstart;
int[] sir;
int rbs;
int r1 = radius + 1;
int routsum, goutsum, boutsum;
int rinsum, ginsum, binsum;
for (y = 0; y < h; y++) {
rinsum = ginsum = binsum = routsum = goutsum = boutsum = rsum = gsum = bsum = 0;
for (i = -radius; i > 16;
sir[1] = (p & 0x00ff00) >> 8;
sir[2] = (p & 0x0000ff);
rbs = r1 – Math.abs(i);
rsum += sir[0] * rbs;
gsum += sir[1] * rbs;
bsum += sir[2] * rbs;
if (i > 0) {
rinsum += sir[0];
ginsum += sir[1];
binsum += sir[2];
} else {
routsum += sir[0];
goutsum += sir[1];
boutsum += sir[2];
}
}
stackpointer = radius;
for (x = 0; x < w; x++) {
r[yi] = dv[rsum];
g[yi] = dv[gsum];
b[yi] = dv[bsum];
rsum -= routsum;
gsum -= goutsum;
bsum -= boutsum;
stackstart = stackpointer – radius + div;
sir = stack[stackstart % div];
routsum -= sir[0];
goutsum -= sir[1];
boutsum -= sir[2];
if (y == 0) {
vmin[x] = Math.min(x + radius + 1, wm);
}
p = pix[yw + vmin[x]];
sir[0] = (p & 0xff0000) >> 16;
sir[1] = (p & 0x00ff00) >> 8;
sir[2] = (p & 0x0000ff);
rinsum += sir[0];
ginsum += sir[1];
binsum += sir[2];
rsum += rinsum;
gsum += ginsum;
bsum += binsum;
stackpointer = (stackpointer + 1) % div;
sir = stack[(stackpointer) % div];
routsum += sir[0];
goutsum += sir[1];
boutsum += sir[2];
rinsum -= sir[0];
ginsum -= sir[1];
binsum -= sir[2];
yi++;
}
yw += w;
}
for (x = 0; x < w; x++) {
rinsum = ginsum = binsum = routsum = goutsum = boutsum = rsum = gsum = bsum = 0;
yp = -radius * w;
for (i = -radius; i 0) {
rinsum += sir[0];
ginsum += sir[1];
binsum += sir[2];
} else {
routsum += sir[0];
goutsum += sir[1];
boutsum += sir[2];
}
if (i < hm) {
yp += w;
}
}
yi = x;
stackpointer = radius;
for (y = 0; y < h; y++) {
pix[yi] = (0xff000000 & pix[yi]) | (dv[rsum] << 16)
| (dv[gsum] << 8) | dv[bsum];
rsum -= routsum;
gsum -= goutsum;
bsum -= boutsum;
stackstart = stackpointer – radius + div;
sir = stack[stackstart % div];
routsum -= sir[0];
goutsum -= sir[1];
boutsum -= sir[2];
if (x == 0) {
vmin[y] = Math.min(y + r1, hm) * w;
}
p = x + vmin[y];
sir[0] = r[p];
sir[1] = g[p];
sir[2] = b[p];
rinsum += sir[0];
ginsum += sir[1];
binsum += sir[2];
rsum += rinsum;
gsum += ginsum;
bsum += binsum;
stackpointer = (stackpointer + 1) % div;
sir = stack[stackpointer];
routsum += sir[0];
goutsum += sir[1];
boutsum += sir[2];
rinsum -= sir[0];
ginsum -= sir[1];
binsum -= sir[2];
yi += w;
}
}
return pix;
}
}

Original: https://www.cnblogs.com/haitao-fan/p/8729091.html
Author: 尼玛范爷
Title: 高斯模糊的Java实现