android图像处理方式有哪些内容,Android图像处理总结。

安卓中图像处理主要通过两种方式：改变颜色矩阵，改变像素点

改变颜色矩阵

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(Paint.ANTI_ALIAS_FLAG);

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;

}

改变像素点

这里以实现图片的怀旧效果为例：

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;

}