安卓實現高斯模糊

關於如何對圖片進行模糊處理，網上方法比較多，常用而又便捷的方法就是使用高斯模糊，但網上的方法大多效果並不理想，今天分享一個之前項目中用到的模糊處理方法來實現高斯模糊，好了，先看模糊效果：

原圖：

 

 

模糊：

 

 

注意點：

對圖片的各種處理大多數是通過bitmap進行操作的，本例也不例外，另外本例是使用imageloader加載的網絡圖片，以給大家一個模糊網絡圖片的參考，當然，加載網絡圖片必然是異步的，所以首次進入界面加載圖片時會有一個等待時間，如果想要完美用戶體驗的話，就需要大家開動腦筋了!

高斯封裝工具類：

BitmapBlurUtil:

package com.byl.blur;

import java.util.concurrent.ExecutorService;

import java.util.concurrent.Executors;

import android.graphics.Bitmap;

import android.graphics.drawable.BitmapDrawable;

import android.graphics.drawable.Drawable;

import android.os.Handler;

import android.os.Message;

public class BitmapBlurUtil {

private static ExecutorService executor;

private static int POOL_SIZE = 2;// 單個CPU線程池大小

private static ExecutorService getExecutor() {

if (executor == null) {

int cpuNums = Runtime.getRuntime().availableProcessors();

executor = Executors.newFixedThreadPool(cpuNums * POOL_SIZE);

}

return executor;

}

public static void addTask(Bitmap bitmap, Handler handler) {

getExecutor().submit(new BitmapVagueTask(bitmap, handler));

}

/** 水平方向模糊度 */

private static float hRadius = 3;

/** 豎直方向模糊度 */

private static float vRadius = 3;

/** 模糊迭代度 */

private static int iterations = 5;

/**

* 異步

* @author baiyuliang

*/

private static class BitmapVagueTask implements Runnable {

private Bitmap bitmap;

private Handler handler;

public BitmapVagueTask(Bitmap bitmap, Handler handler) {

super();

this.bitmap = bitmap;

this.handler = handler;

}

@Override

public void run() {

boxBlurFilter(bitmap, handler);

}

}

/**

* 高斯模糊

*

* @param bmp

* @return

*/

private static void boxBlurFilter(Bitmap bmp, Handler handler) {

int width = bmp.getWidth();

int height = bmp.getHeight();

int[] inPixels = new int[width * height];

int[] outPixels = new int[width * height];

Bitmap bitmap = Bitmap.createBitmap(width, height,Bitmap.Config.ARGB_8888);

bmp.getPixels(inPixels, 0, width, 0, 0, width, height);

for (int i = 0; i < iterations; i++) {

blur(inPixels, outPixels, width, height, hRadius);

blur(outPixels, inPixels, height, width, vRadius);

}

blurFractional(inPixels, outPixels, width, height, hRadius);

blurFractional(outPixels, inPixels, height, width, vRadius);

bitmap.setPixels(inPixels, 0, width, 0, 0, width, height);

if (handler != null) {

@SuppressWarnings("deprecation")

Drawable drawable = new BitmapDrawable(bitmap);

Message message = new Message();

message.obj = drawable;

handler.sendMessage(message);

}

}

private static void blur(int[] in, int[] out, int width, int height,float radius) {

int widthMinus1 = width - 1;

int r = (int) radius;

int tableSize = 2 * r + 1;

int divide[] = new int[256 * tableSize];

for (int i = 0; i < 256 * tableSize; i++)

divide[i] = i / tableSize;

int inIndex = 0;

for (int y = 0; y < height; y++) {

int outIndex = y;

int ta = 0, tr = 0, tg = 0, tb = 0;

for (int i = -r; i <= r; i++) {

int rgb = in[inIndex + clamp(i, 0, width - 1)];

ta += (rgb >> 24) & 0xff;

tr += (rgb >> 16) & 0xff;

tg += (rgb >> 8) & 0xff;

tb += rgb & 0xff;

}

for (int x = 0; x < width; x++) {

out[outIndex] = (divide[ta] << 24) | (divide[tr] << 16)

| (divide[tg] << 8) | divide[tb];

int i1 = x + r + 1;

if (i1 > widthMinus1)

i1 = widthMinus1;

int i2 = x - r;

if (i2 < 0)

i2 = 0;

int rgb1 = in[inIndex + i1];

int rgb2 = in[inIndex + i2];

ta += ((rgb1 >> 24) & 0xff) - ((rgb2 >> 24) & 0xff);

tr += ((rgb1 & 0xff0000) - (rgb2 & 0xff0000)) >> 16;

tg += ((rgb1 & 0xff00) - (rgb2 & 0xff00)) >> 8;

tb += (rgb1 & 0xff) - (rgb2 & 0xff);

outIndex += height;

}

inIndex += width;

}

}

private static void blurFractional(int[] in, int[] out, int width,

int height, float radius) {

radius -= (int) radius;

float f = 1.0f / (1 + 2 * radius);

int inIndex = 0;

for (int y = 0; y < height; y++) {

int outIndex = y;

out[outIndex] = in[0];

outIndex += height;

for (int x = 1; x < width - 1; x++) {

int i = inIndex + x;

int rgb1 = in[i - 1];

int rgb2 = in[i];

int rgb3 = in[i + 1];

int a1 = (rgb1 >> 24) & 0xff;

int r1 = (rgb1 >> 16) & 0xff;

int g1 = (rgb1 >> 8) & 0xff;

int b1 = rgb1 & 0xff;

int a2 = (rgb2 >> 24) & 0xff;

int r2 = (rgb2 >> 16) & 0xff;

int g2 = (rgb2 >> 8) & 0xff;

int b2 = rgb2 & 0xff;

int a3 = (rgb3 >> 24) & 0xff;

int r3 = (rgb3 >> 16) & 0xff;

int g3 = (rgb3 >> 8) & 0xff;

int b3 = rgb3 & 0xff;

a1 = a2 + (int) ((a1 + a3) * radius);

r1 = r2 + (int) ((r1 + r3) * radius);

g1 = g2 + (int) ((g1 + g3) * radius);

b1 = b2 + (int) ((b1 + b3) * radius);

a1 *= f;

r1 *= f;

g1 *= f;

b1 *= f;

out[outIndex] = (a1 << 24) | (r1 << 16) | (g1 << 8) | b1;

outIndex += height;

}

out[outIndex] = in[width - 1];

inIndex += width;

}

}

public static int clamp(int x, int a, int b) {

return (x < a) ? a : (x > b) ? b : x;

}

}

模糊程度可以調節類中的hRadius，vRadius，iterations，三個變量!使用方法：

//加載網絡圖片並得到bitmap

ImageLoader.getInstance().loadImage("/meinv/uploads/160328/1-16032Q42211962.jpg", new ImageLoadingListener() {

@Override

public void onLoadingStarted(String imageUri, View view) {

}

@Override

public void onLoadingFailed(String imageUri, View view,FailReason failReason) {

}

@Override

public void onLoadingComplete(String imageUri, View view, final Bitmap loadedImage) {

if(loadedImage!=null){

//模糊處理

BitmapBlurUtil.addTask(loadedImage, new Handler(){

@Override

public void handleMessage(Message msg) {

super.handleMessage(msg);

Drawable drawable = (Drawable) msg.obj;

iv_blur.setImageDrawable(drawable);

loadedImage.recycle();

}

});

}

}

@Override

public void onLoadingCancelled(String imageUri, View view) {

}

});