Android实现图像灰度化、线性灰度变化和二值化处理方法

public Bitmap bitmap2Gray(Bitmap bmSrc) {   // 得到图片的长和宽   int width = bmSrc.getWidth();   int height = bmSrc.getHeight();   // 创建目标灰度图像   Bitmap bmpGray = null;   bmpGray = Bitmap.createBitmap(width, height, Bitmap.Config.RGB_565);   // 创建画布   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(bmSrc, 0, 0, paint);   return bmpGray; }

public Bitmap lineGrey(Bitmap image) {  //得到图像的宽度和长度   int width = image.getWidth();   int height = image.getHeight();   //创建线性拉升灰度图像   Bitmap linegray = null;   linegray = image.copy(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++) {       //得到每点的像素值       int col = image.getPixel(i, j);       int alpha = col & 0xFF000000;       int red = (col & 0x00FF0000) >> 16;       int green = (col & 0x0000FF00) >> 8;       int blue = (col & 0x000000FF);       // 增加了图像的亮度       red = (int) (1.1 * red + 30);       green = (int) (1.1 * green + 30);       blue = (int) (1.1 * blue + 30);       //对图像像素越界进行处理       if (red >= 255)        {         red = 255;       }       if (green >= 255) {         green = 255;       }       if (blue >= 255) {         blue = 255;       }       // 新的ARGB       int newColor = alpha | (red << 16) | (green << 8) | blue;       //设置新图像的RGB值       linegray.setPixel(i, j, newColor);     }   }   return linegray; } 

public Bitmap gray2Binary(Bitmap graymap) {   //得到图形的宽度和长度   int width = graymap.getWidth();   int height = graymap.getHeight();   //创建二值化图像   Bitmap binarymap = null;   binarymap = graymap.copy(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++) {       //得到当前像素的值       int col = binarymap.getPixel(i, j);       //得到alpha通道的值       int alpha = col & 0xFF000000;       //得到图像的像素RGB的值       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; }