/**
* 转为二值图像
*
* @param bmp
* 原图bitmap
* @return
*/
public static Bitmap convertToBMW(Bitmap bmp) {
int width = bmp.getWidth(); // 获取位图的宽
int height = bmp.getHeight(); // 获取位图的高
int[] pixels = new int[width * height]; // 通过位图的大小创建像素点数组
bmp.getPixels(pixels, 0, width, 0, 0, width, height);
for (int i = 0; i < height; i++) {
for (int j = 0; j < width; j++) {
int grey = pixels[width * i + j];
// 分离三原色
int alpha = ((grey & 0xFF000000) >> 24);
int red = ((grey & 0x00FF0000) >> 16);
int green = ((grey & 0x0000FF00) >> 8);
int blue = (grey & 0x000000FF);
int avg = (red + green +blue)/3;
avg = getTowValue(avg);//去掉 为灰度图
pixels[width * i + j] = alpha << 24 | avg << 16 | avg << 8
| avg;
}
}
// 新建图片
Bitmap newBmp = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);
// 设置图片数据
newBmp.setPixels(pixels, 0, width, 0, 0, width, height);
Bitmap resizeBmp = ThumbnailUtils.extractThumbnail(newBmp, width, height);
return resizeBmp;
}
static int getTwoValue(int value){
// 设定二值化的域值,默认值为100
if (value>100){
return 255;
}else {
return 0;
}
}
android 灰度图 黑白图
最新推荐文章于 2023-08-21 19:35:41 发布