Android下常用的图像处理程序(灰度化、线性灰度变化、二值化)

来源：互联网发布：动态表单数据库设计编辑：程序博客网时间：2024/06/05 06:33

1、图像灰度化：

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;}

2、对图像进行线性灰度变化

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ARGBint newColor = alpha | (red << 16) | (green << 8) | blue;//设置新图像的RGB值linegray.setPixel(i, j, newColor);}}return linegray;}

3、对图像进行二值化

// 该函数实现对图像进行二值化处理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RGBint 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ARGBint 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;}