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ARGB

int 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

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;

}

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持编程圈。