直接上代码了

/** * 图片灰度化和二值化处理 * Created by kaifa on 2016/2/14. */public class ImageFilter {    /**     * 图片灰度处理     *     * @return     */    public static Bitmap grayScale(Bitmap bitmap) {        int width, height;        height = bitmap.getHeight();        width = bitmap.getWidth();        Bitmap bmpGray = null;        bmpGray = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);        Canvas c = new Canvas(bmpGray);        Paint paint = new Paint();        ColorMatrix cm = new ColorMatrix();        cm.setSaturation(0);        ColorMatrixColorFilter f = new ColorMatrixColorFilter(cm);        paint.setColorFilter(f);        c.drawBitmap(bitmap, 0, 0, paint);        return bmpGray;    }    /**     * 图片二值化处理     *     * @param bitmap     * @return     */    public static Bitmap binaryzation(Bitmap bitmap) {        //得到图形的宽度和长度          int width = bitmap.getWidth();        int height = bitmap.getHeight();        //创建二�?化图像 �?        Bitmap binarymap = null;        binarymap = bitmap.copy(Bitmap.Config.ARGB_8888, true);        //依次循环，对图像的像素进行处理 �?        for (int i = 0; i < width; i++) {            for (int j = 0; j < height; j++) {                //得到当前像素的�?                  int col = binarymap.getPixel(i, j);                //得到alpha通道的�?                  int alpha = col & 0xFF000000;                //得到图像的像素RGB的�?                  int red = (col & 0x00FF0000) >> 16;                int green = (col & 0x0000FF00) >> 8;                int blue = (col & 0x000000FF);                // 用公式X = 0.3×R+0.59×G+0.11×B计算出X代替原来的RGB                  int gray = (int) ((float) red * 0.3 + (float) green * 0.59 +                        (float) blue * 0.11);                //对图像进行二值化处理                  if (gray <= 95) {                    gray = 0;                } else {                    gray = 255;                }                // 新的ARGB                  int newColor = alpha | (gray << 16) | (gray << 8) | gray;                //设置新图像的当前像素值 �?                binarymap.setPixel(i, j, newColor);            }        }        return binarymap;    }}

忘了在哪里找的了，反正分享出来吧