Android 图像处理
Duang Duang~
学习一下原理：
Matrix：
其中 e,j,o,t 为偏移量
aR+bG+cB+dA+e
fR+gG+hB+iA+j
kR+lG+mB+nA+o
pR+qG+rB+sA+t
=
R1
G1
B1
A1
在 onCreate 函数中用 post 来获取组件的宽高：
mGroup.post(new Runnable() {
@Override
public void run() {
mEtWidth = mGroup.getWidth() / 5;
mEtHeight = mGroup.getHeight() / 4;
addEts();
initMatrix();
}
});
最后一弹，共实现负片，怀旧，浮雕，灰度，圆角，油画和左右对称 7 种特效：
实现的 ImageHelper 如下：
package com.zms.imageprocess;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.ColorMatrix;
import android.graphics.ColorMatrixColorFilter;
import android.graphics.Matrix;
import android.graphics.Paint;
import android.graphics.PorterDuff;
import android.graphics.PorterDuffXfermode;
import android.graphics.Rect;
import android.graphics.RectF;
import java.util.Random;
/**
Created by Administrator on 2015/4/1.
*/
public class ImageHelper {
// hue-色相 saturation-饱和度 lum-亮度
public static Bitmap ImageEffect(Bitmap bitmap, float hue, float saturation, float luminance) {
Bitmap mBitmap = Bitmap.createBitmap(bitmap.getWidth(), bitmap.getHeight(), Bitmap.Config.ARGB_8888);
Canvas canvas = new Canvas(mBitmap);
Paint paint = new Paint(Paint.ANTI_ALIAS_FLAG);
// Hue-色相/色调
ColorMatrix hueMatrix = new ColorMatrix();
hueMatrix.setRotate(0, hue); // RED
hueMatrix.setRotate(1, hue); // GREEN
hueMatrix.setRotate(2, hue); // BLUE
// Saturation-饱和度
ColorMatrix saturationMatrix = new ColorMatrix();
saturationMatrix.setSaturation(saturation);
// Luminance-亮度/明度
ColorMatrix luminanceMatrix = new ColorMatrix();
// setScale(float rScale, float gScale, float bScale, float aScale)
luminanceMatrix.setScale(luminance, luminance, luminance, 1);
ColorMatrix imageMatrix = new ColorMatrix();
imageMatrix.postConcat(hueMatrix);
imageMatrix.postConcat(saturationMatrix);
imageMatrix.postConcat(luminanceMatrix);
paint.setColorFilter(new ColorMatrixColorFilter(imageMatrix));
// drawBitmap(@NonNull Bitmap bitmap, float left, float top, @Nullable Paint paint)
canvas.drawBitmap(bitmap, 0, 0, paint);
return mBitmap;
}
public static Bitmap handleImage(Bitmap bm, int effect) {
Bitmap bitmap = Bitmap.createBitmap(bm.getWidth(), bm.getHeight(),
Bitmap.Config.ARGB_8888);
int width = bm.getWidth();
int height = bm.getHeight();
int color = 0;
int r, g, b, a, r1, g1, b1;
int[] oldPx = new int[width * height];
int[] newPx = new int[width * height];
bm.getPixels(oldPx, 0, width, 0, 0, width, height);
switch (effect) {
case 0: // 负片效果
for (int i = 0; i < width * height; i++) {
color = oldPx[i];
r = Color.red(color);
g = Color.green(color);
b = Color.blue(color);
a = Color.alpha(color);
r = 255 - r;
g = 255 - g;
b = 255 - b;
if (r > 255) {
r = 255;
} else if (r < 0) {
r = 0;
}
if (g > 255) {
g = 255;
} else if (g < 0) {
g = 0;
}
if (b > 255) {
b = 255;
} else if (b < 0) {
b = 0;
}
newPx[i] = Color.argb(a, r, g, b);
}
bitmap.setPixels(newPx, 0, width, 0, 0, width, height);
break;
case 1: // 怀旧效果
for (int i = 0; i < width * height; i++) {
color = oldPx[i];
a = Color.alpha(color);
r = Color.red(color);
g = Color.green(color);
b = Color.blue(color);
r1 = (int) (0.393 * r + 0.769 * g + 0.189 * b);
g1 = (int) (0.349 * r + 0.686 * g + 0.168 * b);
b1 = (int) (0.272 * r + 0.534 * g + 0.131 * b);
if (r1 > 255) {
r1 = 255;
}
if (g1 > 255) {
g1 = 255;
}
if (b1 > 255) {
b1 = 255;
}
newPx[i] = Color.argb(a, r1, g1, b1);
}
bitmap.setPixels(newPx, 0, width, 0, 0, width, height);
break;
case 2: // 浮雕效果
int colorBefore = 0;
for (int i = 1; i < width * height; i++) {
colorBefore = oldPx[i - 1];
a = Color.alpha(colorBefore);
r = Color.red(colorBefore);
g = Color.green(colorBefore);
b = Color.blue(colorBefore);
color = oldPx[i];
r1 = Color.red(color);
g1 = Color.green(color);
b1 = Color.blue(color);
r = (r - r1 + 127);
g = (g - g1 + 127);
b = (b - b1 + 127);
if (r > 255) {
r = 255;
}
if (g > 255) {
g = 255;
}
if (b > 255) {
b = 255;
}
newPx[i] = Color.argb(a, r, g, b);
}
bitmap.setPixels(newPx, 0, width, 0, 0, width, height);
break;
case 3: // 灰度
int alpha = 0xFF << 24;
for (int i = 0; i < height; i++) {
for (int j = 0; j < width; j++) {
int grey = oldPx[width * i + j];
int red = ((grey & 0x00FF0000) >> 16);
int green = ((grey & 0x0000FF00) >> 8);
int blue = (grey & 0x000000FF);
grey = (int) ((float) red * 0.3 + (float) green * 0.59 + (float) blue * 0.11);
grey = alpha | (grey << 16) | (grey << 8) | grey;
newPx[width * i + j] = grey;
}
}
bitmap.setPixels(newPx, 0, width, 0, 0, width, height);
break;
case 4: // 圆角
int roundPx = 55;
Canvas canvas = new Canvas(bitmap);
int colorRound = 0xff424242;
Paint paint = new Paint();
Rect rect = new Rect(0, 0, bm.getWidth(), bm.getHeight());
RectF rectF = new RectF(rect);
paint.setAntiAlias(true);
canvas.drawARGB(0, 0, 0, 0);
paint.setColor(colorRound);
canvas.drawRoundRect(rectF, roundPx, roundPx, paint);
paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.SRC_IN));
canvas.drawBitmap(bm, rect, rect, paint);
break;
case 5: // 油画
int Radio = 0;
Random rnd = new Random();
int iModel = 10;
int i = width - iModel;
while (i > 1) {
int j = height - iModel;
while (j > 1) {
int iPos = rnd.nextInt(10) % iModel;
color = bm.getPixel(i + iPos, j + iPos);
bitmap.setPixel(i, j, color);
j = j - 1;
}
i = i - 1;
}
break;
case 6: // 左右对称
Canvas canvas2 = new Canvas(bitmap);
canvas2.drawColor(Color.BLACK);
canvas2.drawBitmap(bm, 0, 0, null);
Matrix matrix = new Matrix();
float[] values = {-1f, 0.0f, 0.0f, 0.0f, 1f, 0.0f, 0.0f, 0.0f, 1.0f};
matrix.setValues(values);
bitmap = Bitmap.createBitmap(bm, 0, 0, bm.getWidth(), bm.getHeight(),
matrix, true);
canvas2.drawBitmap(bitmap, bm.getWidth(), 0, null);
break;
}
return bitmap;
}
}
图像虚化：
上图是原图，下图是虚幻化后效果，可以拖拽 SeekBar 进行不同程度的虚化，如下：
package com.zms.blureffect;
import android.app.Activity;
import android.graphics.Bitmap;
import android.graphics.drawable.BitmapDrawable;
import android.graphics.drawable.Drawable;
import android.os.Bundle;
import android.util.Log;
import android.view.Display;
import android.widget.ImageView;
import android.widget.SeekBar;
import java.lang.reflect.Field;
public class Main extends Activity {
private int scaleWidth = 100;
private int scaleHeight = 100;
private int radius = 5;
private Drawable blurImage;
private String TAG = “BLUR”;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
SeekBar seekBar = (SeekBar) findViewById(R.id.seekBar1);
seekBar.setMax(24);
seekBar.setOnSeekBarChangeListener(new SeekBarListener());
Display display = this.getWindowManager().getDefaultDisplay();
scaleWidth = display.getWidth();
scaleHeight = (display.getHeight() - getStatusBarHeight()) / 2;
blurImage = getResources().getDrawable(R.drawable.note); // 要模糊的图片
BlurImage(blurImage, radius);
}
private class SeekBarListener implements SeekBar.OnSeekBarChangeListener {
// boolean fromUser 是用户操作进度条，还是代码中 setProgress
public void onProgressChanged(
SeekBar seekBar, int progress, boolean fromUser) {
System.out.println(progress);
if (seekBar.getProgress() > 0) {
BlurImage(blurImage, seekBar.getProgress());
} else {
// 当模糊半径为 0 时显示原图
ImageView imgAfter = (ImageView) findViewById(R.id.imgAfter);
Bitmap bitmapAfter = ((BitmapDrawable) blurImage).getBitmap();
Bitmap bitmapAfterAdjust = Bitmap.createScaledBitmap(bitmapAfter, scaleWidth,
scaleHeight, true); // 调整大小
imgAfter.setImageBitmap(bitmapAfterAdjust);
}
}
// 当用户开始滑动进度条时
public void onStartTrackingTouch(SeekBar seekBar) {
System.out.println("Start-->" + seekBar.getProgress());
}
// 当用户结束滑动进度条时
public void onStopTrackingTouch(SeekBar seekBar) {
System.out.println("Stop-->" + seekBar.getProgress());
}
}
public void BlurImage(Drawable blurImage, int radius) {
// 模糊前：
ImageView imgBefore = (ImageView) findViewById(R.id.imgBefore);
// Bitmap bitmapBefore =
// BitmapFactory.decodeResource(getResources(),R.drawable.note); // 方法一
Bitmap bitmapBefore = ((BitmapDrawable) blurImage).getBitmap(); // 方法二：drawable 转成 bitmap
Bitmap bitmapBeforeAdjust = Bitmap.createScaledBitmap(bitmapBefore,
scaleWidth, scaleHeight, true);
imgBefore.setImageBitmap(bitmapBeforeAdjust);
// 模糊后：
ImageView imgAfter = (ImageView) findViewById(R.id.imgAfter);
Bitmap bitmapAfter = Blur.fastblur(this, bitmapBefore, radius); // 第三个参数是模糊半径：0<radius<25
Bitmap bitmapAfterAdjust = Bitmap.createScaledBitmap(bitmapAfter,
scaleWidth, scaleHeight, true); // 调整大小
imgAfter.setImageBitmap(bitmapAfterAdjust);
}
/**
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