Android图像处理技巧实例
来源：互联网 发布：杭州软件定制开发 编辑：程序博客网 时间：2024/06/05 07:03
导语
书上讲的很细，还讲了一些原理，原理需要一些线性代数的知识，线代都忘光了，这里都是实例，想看理论知识戳我。
主要内容
- 通过SeekBar调节色调、饱和度、亮度
- 模拟4x5的颜色矩阵
- 底片效果、老照片效果、浮雕效果
- 飘动的旗子
- 刮刮卡效果
- 倒影图片效果
- 正弦曲线
- 绘图板
具体内容
通过SeekBar调节色调、饱和度、亮度
布局：
<?xml version="1.0" encoding="utf-8"?><RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical"> <ImageView android:id="@+id/imageview" android:layout_width="300dp" android:layout_height="300dp" android:layout_centerHorizontal="true" android:layout_marginBottom="24dp" android:layout_marginTop="24dp" /> <SeekBar android:id="@+id/seekbarHue" android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_below="@id/imageview" /> <SeekBar android:id="@+id/seekbarSaturation" android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_below="@id/seekbarHue" /> <SeekBar android:id="@+id/seekbatLum" android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_below="@id/seekbarSaturation" /></RelativeLayout>Activity：
public class PrimaryColor extends Activity implements SeekBar.OnSeekBarChangeListener { private static int MAX_VALUE = 255; private static int MID_VALUE = 127; private ImageView mImageView; private SeekBar mSeekbarhue, mSeekbarSaturation, mSeekbarLum; private float mHue, mStauration, mLum; private Bitmap bitmap; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.primary_color); bitmap = BitmapFactory.decodeResource(getResources(), R.drawable.test3); mImageView = (ImageView) findViewById(R.id.imageview); mSeekbarhue = (SeekBar) findViewById(R.id.seekbarHue); mSeekbarSaturation = (SeekBar) findViewById(R.id.seekbarSaturation); mSeekbarLum = (SeekBar) findViewById(R.id.seekbatLum); mSeekbarhue.setOnSeekBarChangeListener(this); mSeekbarSaturation.setOnSeekBarChangeListener(this); mSeekbarLum.setOnSeekBarChangeListener(this); mSeekbarhue.setMax(MAX_VALUE); mSeekbarSaturation.setMax(MAX_VALUE); mSeekbarLum.setMax(MAX_VALUE); mSeekbarhue.setProgress(MID_VALUE); mSeekbarSaturation.setProgress(MID_VALUE); mSeekbarLum.setProgress(MID_VALUE); mImageView.setImageBitmap(bitmap); } @Override public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) { switch (seekBar.getId()) { case R.id.seekbarHue: mHue = (progress - MID_VALUE) * 1.0F / MID_VALUE * 180; break; case R.id.seekbarSaturation: mStauration = progress * 1.0F / MID_VALUE; break; case R.id.seekbatLum: mLum = progress * 1.0F / MID_VALUE; break; } mImageView.setImageBitmap(ImageHelper.handleImageEffect( bitmap, mHue, mStauration, mLum)); } @Override public void onStartTrackingTouch(SeekBar seekBar) { } @Override public void onStopTrackingTouch(SeekBar seekBar) { }}ImageHelper：
public class ImageHelper { public static Bitmap handleImageEffect(Bitmap bm, float hue, float saturation, float lum) { Bitmap bmp = Bitmap.createBitmap( bm.getWidth(), bm.getHeight(), Bitmap.Config.ARGB_8888); Canvas canvas = new Canvas(bmp); Paint paint = new Paint(); ColorMatrix hueMatrix = new ColorMatrix(); hueMatrix.setRotate(0, hue); hueMatrix.setRotate(1, hue); hueMatrix.setRotate(2, hue); ColorMatrix saturationMatrix = new ColorMatrix(); saturationMatrix.setSaturation(saturation); ColorMatrix lumMatrix = new ColorMatrix(); lumMatrix.setScale(lum, lum, lum, 1); ColorMatrix imageMatrix = new ColorMatrix(); imageMatrix.postConcat(hueMatrix); imageMatrix.postConcat(saturationMatrix); imageMatrix.postConcat(lumMatrix); paint.setColorFilter(new ColorMatrixColorFilter(imageMatrix)); canvas.drawBitmap(bm, 0, 0, paint); return bmp; }}效果图：
模拟4x5的颜色矩阵
布局：
<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical"> <ImageView android:id="@+id/imageview" android:layout_width="match_parent" android:layout_height="0dp" android:layout_weight="2" /> <GridLayout android:id="@+id/group" android:layout_width="match_parent" android:layout_height="0dp" android:layout_weight="3" android:columnCount="5" android:rowCount="4"> </GridLayout> <LinearLayout android:layout_width="match_parent" android:layout_height="wrap_content" android:orientation="horizontal"> <Button android:layout_width="0dp" android:layout_height="wrap_content" android:layout_weight="1" android:onClick="btnChange" android:text="Change" /> <Button android:layout_width="0dp" android:layout_height="wrap_content" android:layout_weight="1" android:onClick="btnReset" android:text="Reset" /> </LinearLayout></LinearLayout>Activity：
public class ColorMatrix extends Activity { private ImageView mImageView; private GridLayout mGroup; private Bitmap bitmap; private int mEtWidth, mEtHeight; private EditText[] mEts = new EditText[20]; private float[] mColorMatrix = new float[20]; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.color_matrix); bitmap = BitmapFactory.decodeResource(getResources(), R.drawable.test1); mImageView = (ImageView) findViewById(R.id.imageview); mGroup = (GridLayout) findViewById(R.id.group); mImageView.setImageBitmap(bitmap); mGroup.post(new Runnable() { @Override public void run() { // 获取宽高信息 mEtWidth = mGroup.getWidth() / 5; mEtHeight = mGroup.getHeight() / 4; addEts(); initMatrix(); } }); } // 获取矩阵值 private void getMatrix() { for (int i = 0; i < 20; i++) { mColorMatrix[i] = Float.valueOf( mEts[i].getText().toString()); } } // 将矩阵值设置到图像 private void setImageMatrix() { Bitmap bmp = Bitmap.createBitmap( bitmap.getWidth(), bitmap.getHeight(), Bitmap.Config.ARGB_8888); android.graphics.ColorMatrix colorMatrix = new android.graphics.ColorMatrix(); colorMatrix.set(mColorMatrix); Canvas canvas = new Canvas(bmp); Paint paint = new Paint(); paint.setColorFilter(new ColorMatrixColorFilter(colorMatrix)); canvas.drawBitmap(bitmap, 0, 0, paint); mImageView.setImageBitmap(bmp); } // 作用矩阵效果 public void btnChange(View view) { getMatrix(); setImageMatrix(); } // 重置矩阵效果 public void btnReset(View view) { initMatrix(); getMatrix(); setImageMatrix(); } // 添加EditText private void addEts() { for (int i = 0; i < 20; i++) { EditText editText = new EditText(ColorMatrix.this); mEts[i] = editText; mGroup.addView(editText, mEtWidth, mEtHeight); } } // 初始化颜色矩阵为初始状态 private void initMatrix() { for (int i = 0; i < 20; i++) { if (i % 6 == 0) { mEts[i].setText(String.valueOf(1)); } else { mEts[i].setText(String.valueOf(0)); } } }}关键点：将一个颜色矩阵传入画笔，然后画出原始的图在新建的图上面。
paint.setColorFilter(new ColorMatrixColorFilter(colorMatrix));效果图：
底片效果、老照片效果、浮雕效果
布局：
<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical"> <LinearLayout android:layout_width="match_parent" android:layout_height="0dp" android:layout_weight="1"> <ImageView android:id="@+id/imageview1" android:layout_width="0dp" android:layout_height="match_parent" android:layout_weight="1" /> <ImageView android:id="@+id/imageview2" android:layout_width="0dp" android:layout_height="match_parent" android:layout_weight="1" /> </LinearLayout> <LinearLayout android:layout_width="match_parent" android:layout_height="0dp" android:layout_weight="1"> <ImageView android:id="@+id/imageview3" android:layout_width="0dp" android:layout_height="match_parent" android:layout_weight="1" /> <ImageView android:id="@+id/imageview4" android:layout_width="0dp" android:layout_height="match_parent" android:layout_weight="1" /> </LinearLayout></LinearLayout>Activity：
public class PixelsEffect extends Activity { private ImageView imageView1, imageView2, imageView3, imageView4; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.pixels_effect); Bitmap bitmap = BitmapFactory.decodeResource(getResources(), R.drawable.test2); imageView1 = (ImageView) findViewById(R.id.imageview1); imageView2 = (ImageView) findViewById(R.id.imageview2); imageView3 = (ImageView) findViewById(R.id.imageview3); imageView4 = (ImageView) findViewById(R.id.imageview4); imageView1.setImageBitmap(bitmap); imageView2.setImageBitmap(ImageHelper.handleImageNegative(bitmap)); imageView3.setImageBitmap(ImageHelper.handleImagePixelsOldPhoto(bitmap)); imageView4.setImageBitmap(ImageHelper.handleImagePixelsRelief(bitmap)); }}工具类：
public class ImageHelper { public static Bitmap handleImageNegative(Bitmap bm) { int width = bm.getWidth(); int height = bm.getHeight(); int color; int r, g, b, a; Bitmap bmp = Bitmap.createBitmap(width, height , Bitmap.Config.ARGB_8888); int[] oldPx = new int[width * height]; int[] newPx = new int[width * height]; bm.getPixels(oldPx, 0, width, 0, 0, width, height); 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); } bmp.setPixels(newPx, 0, width, 0, 0, width, height); return bmp; } public static Bitmap handleImagePixelsOldPhoto(Bitmap bm) { Bitmap bmp = 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, bm.getWidth(), 0, 0, width, height); 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); } bmp.setPixels(newPx, 0, width, 0, 0, width, height); return bmp; } public static Bitmap handleImagePixelsRelief(Bitmap bm) { Bitmap bmp = Bitmap.createBitmap(bm.getWidth(), bm.getHeight(), Bitmap.Config.ARGB_8888); int width = bm.getWidth(); int height = bm.getHeight(); int color = 0, colorBefore = 0; int a, r, g, b; int r1, g1, b1; int[] oldPx = new int[width * height]; int[] newPx = new int[width * height]; bm.getPixels(oldPx, 0, bm.getWidth(), 0, 0, width, height); 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); } bmp.setPixels(newPx, 0, width, 0, 0, width, height); return bmp; }}效果图：
飘动的旗子
FlagBitmapMeshView：
public class FlagBitmapMeshView extends View { private final int WIDTH = 200; private final int HEIGHT = 200; private int COUNT = (WIDTH + 1) * (HEIGHT + 1); private float[] verts = new float[COUNT * 2]; private float[] orig = new float[COUNT * 2]; private Bitmap bitmap; private float A; private float k = 1; public FlagBitmapMeshView(Context context) { super(context); initView(context); } public FlagBitmapMeshView(Context context, AttributeSet attrs) { super(context, attrs); initView(context); } public FlagBitmapMeshView(Context context, AttributeSet attrs, int defStyleAttr) { super(context, attrs, defStyleAttr); initView(context); } private void initView(Context context) { setFocusable(true); bitmap = BitmapFactory.decodeResource(context.getResources(), R.drawable.test); float bitmapWidth = bitmap.getWidth(); float bitmapHeight = bitmap.getHeight(); int index = 0; for (int y = 0; y <= HEIGHT; y++) { float fy = bitmapHeight * y / HEIGHT; for (int x = 0; x <= WIDTH; x++) { float fx = bitmapWidth * x / WIDTH; orig[index * 2 + 0] = verts[index * 2 + 0] = fx; orig[index * 2 + 1] = verts[index * 2 + 1] = fy + 100; index += 1; } } A = 50; } @Override protected void onDraw(Canvas canvas) { flagWave(); k += 0.1F; canvas.drawBitmapMesh(bitmap, WIDTH, HEIGHT, verts, 0, null, 0, null); invalidate(); } private void flagWave() { for (int j = 0; j <= HEIGHT; j++) { for (int i = 0; i <= WIDTH; i++) { verts[(j * (WIDTH + 1) + i) * 2 + 0] += 0; float offsetY = (float) Math.sin((float) i / WIDTH * 2 * Math.PI + Math.PI * k); verts[(j * (WIDTH + 1) + i) * 2 + 1] = orig[(j * WIDTH + i) * 2 + 1] + offsetY * A; } } }}效果图：
刮刮卡效果
XfermodeView：
public class XfermodeView extends View { private Bitmap mBgBitmap, mFgBitmap; private Paint mPaint; private Canvas mCanvas; private Path mPath; public XfermodeView(Context context) { super(context); init(); } public XfermodeView(Context context, AttributeSet attrs) { super(context, attrs); init(); } public XfermodeView(Context context, AttributeSet attrs, int defStyleAttr) { super(context, attrs, defStyleAttr); init(); } private void init() { mPaint = new Paint(); mPaint.setAlpha(0); mPaint.setXfermode( new PorterDuffXfermode(PorterDuff.Mode.DST_IN)); mPaint.setStyle(Paint.Style.STROKE); mPaint.setStrokeJoin(Paint.Join.ROUND); mPaint.setStrokeWidth(50); mPaint.setStrokeCap(Paint.Cap.ROUND); mPath = new Path(); mBgBitmap = BitmapFactory.decodeResource(getResources(), R.drawable.test); mFgBitmap = Bitmap.createBitmap(mBgBitmap.getWidth(), mBgBitmap.getHeight(), Bitmap.Config.ARGB_8888); mCanvas = new Canvas(mFgBitmap); mCanvas.drawColor(Color.GRAY); } @Override public boolean onTouchEvent(MotionEvent event) { switch (event.getAction()) { case MotionEvent.ACTION_DOWN: mPath.reset(); mPath.moveTo(event.getX(), event.getY()); break; case MotionEvent.ACTION_MOVE: mPath.lineTo(event.getX(), event.getY()); break; } mCanvas.drawPath(mPath, mPaint); invalidate(); return true; } @Override protected void onDraw(Canvas canvas) { canvas.drawBitmap(mBgBitmap, 0, 0, null); canvas.drawBitmap(mFgBitmap, 0, 0, null); }}效果图：
倒影图片效果
ReflectView：
public class ReflectView extends View { private Bitmap mSrcBitmap, mRefBitmap; private Paint mPaint; private PorterDuffXfermode mXfermode; public ReflectView(Context context) { super(context); initRes(context); } public ReflectView(Context context, AttributeSet attrs) { super(context, attrs); initRes(context); } public ReflectView(Context context, AttributeSet attrs, int defStyleAttr) { super(context, attrs, defStyleAttr); initRes(context); } private void initRes(Context context) { mSrcBitmap = BitmapFactory.decodeResource(getResources(), R.drawable.test); Matrix matrix = new Matrix(); matrix.setScale(1F, -1F); mRefBitmap = Bitmap.createBitmap(mSrcBitmap, 0, 0, mSrcBitmap.getWidth(), mSrcBitmap.getHeight(), matrix, true); mPaint = new Paint(); mPaint.setShader(new LinearGradient(0, mSrcBitmap.getHeight(), 0, mSrcBitmap.getHeight() + mSrcBitmap.getHeight() / 4, 0XDD000000, 0X10000000, Shader.TileMode.CLAMP)); mXfermode = new PorterDuffXfermode(PorterDuff.Mode.DST_IN); } @Override protected void onDraw(Canvas canvas) { canvas.drawColor(Color.BLACK); canvas.drawBitmap(mSrcBitmap, 0, 0, null); canvas.drawBitmap(mRefBitmap, 0, mSrcBitmap.getHeight(), null); mPaint.setXfermode(mXfermode); // 绘制渐变效果矩形 canvas.drawRect(0, mSrcBitmap.getHeight(), mRefBitmap.getWidth(), mSrcBitmap.getHeight() * 2, mPaint); mPaint.setXfermode(null); }}效果图：
正弦曲线
SinView：
public class SinView extends SurfaceView implements SurfaceHolder.Callback, Runnable { private SurfaceHolder mHolder; private Canvas mCanvas; private boolean mIsDrawing; private int x = 0; private int y = 0; private Path mPath; private Paint mPaint; public SinView(Context context) { super(context); initView(); } public SinView(Context context, AttributeSet attrs) { super(context, attrs); initView(); } public SinView(Context context, AttributeSet attrs, int defStyle) { super(context, attrs, defStyle); initView(); } private void initView() { mHolder = getHolder(); mHolder.addCallback(this); setFocusable(true); setFocusableInTouchMode(true); this.setKeepScreenOn(true); mPath = new Path(); mPaint = new Paint(Paint.ANTI_ALIAS_FLAG); mPaint.setColor(Color.RED); mPaint.setStyle(Paint.Style.STROKE); mPaint.setStrokeWidth(10); mPaint.setStrokeCap(Paint.Cap.ROUND); mPaint.setStrokeJoin(Paint.Join.ROUND); } @Override public void surfaceCreated(SurfaceHolder holder) { mIsDrawing = true; mPath.moveTo(0, 400); new Thread(this).start(); } @Override public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) { } @Override public void surfaceDestroyed(SurfaceHolder holder) { mIsDrawing = false; } @Override public void run() { while (mIsDrawing) { draw(); x += 1; y = (int) (100*Math.sin(x * 2 * Math.PI / 180) + 400); mPath.lineTo(x, y); } } private void draw() { try { mCanvas = mHolder.lockCanvas(); // SurfaceView背景 mCanvas.drawColor(Color.WHITE); mCanvas.drawPath(mPath, mPaint); } catch (Exception e) { } finally { if (mCanvas != null) mHolder.unlockCanvasAndPost(mCanvas); } }}效果图：
绘图板
SimpleDraw：
public class SimpleDraw extends SurfaceView implements SurfaceHolder.Callback, Runnable { private SurfaceHolder mHolder; private Canvas mCanvas; private boolean mIsDrawing; private Path mPath; private Paint mPaint; public SimpleDraw(Context context) { super(context); initView(); } public SimpleDraw(Context context, AttributeSet attrs) { super(context, attrs); initView(); } public SimpleDraw(Context context, AttributeSet attrs, int defStyle) { super(context, attrs, defStyle); initView(); } private void initView() { mHolder = getHolder(); mHolder.addCallback(this); setFocusable(true); setFocusableInTouchMode(true); this.setKeepScreenOn(true); mPath = new Path(); mPaint = new Paint(); mPaint.setColor(Color.RED); mPaint.setStyle(Paint.Style.STROKE); mPaint.setStrokeWidth(20); } @Override public void surfaceCreated(SurfaceHolder holder) { mIsDrawing = true; new Thread(this).start(); } @Override public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) { } @Override public void surfaceDestroyed(SurfaceHolder holder) { mIsDrawing = false; } @Override public void run() { long start = System.currentTimeMillis(); while (mIsDrawing) { draw(); } long end = System.currentTimeMillis(); // 50 - 100 if (end - start < 100) { try { Thread.sleep(100 - (end - start)); } catch (InterruptedException e) { e.printStackTrace(); } } } private void draw() { try { mCanvas = mHolder.lockCanvas(); mCanvas.drawColor(Color.WHITE); mCanvas.drawPath(mPath, mPaint); } catch (Exception e) { } finally { if (mCanvas != null) mHolder.unlockCanvasAndPost(mCanvas); } } @Override public boolean onTouchEvent(MotionEvent event) { int x = (int) event.getX(); int y = (int) event.getY(); switch (event.getAction()) { case MotionEvent.ACTION_DOWN: mPath.moveTo(x, y); break; case MotionEvent.ACTION_MOVE: mPath.lineTo(x, y); break; case MotionEvent.ACTION_UP: break; } return true; }}效果图：
总结
理解上面的案例。
进入我的CSDN戳这里（我的博客导航）
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