我正在爲我的最後一年做臉部識別項目。我必須使用本地二進制模式(LBP)在Android上進行臉部識別。將位圖(RGB_565)轉換爲灰度(8位)Android
我在網上搜索了很多在java中使用LBP進行人臉識別的代碼,但在android上找不到任何可實現的東西。所以現在我不得不把它寫出來,而且我對android和圖像處理都是一種新手。
我已經找到了一種從相機捕捉圖像的方法。
public class CameraCapture extends Activity {
protected boolean _taken = true;
File sdImageMainDirectory;
protected static final String PHOTO_TAKEN = "photo_taken";
@Override
public void onCreate(Bundle savedInstanceState) {
try {
super.onCreate(savedInstanceState);
File root = new File(Environment
.getExternalStorageDirectory()
+ File.separator + "myDir" + File.separator);
root.mkdirs();
sdImageMainDirectory = new File(root, "myPicName");
startCameraActivity();
}
catch (Exception e) {
finish();
Toast.makeText(this, "Error occured. Please try again later.",
Toast.LENGTH_SHORT).show();
}
}
protected void startCameraActivity() {
Uri outputFileUri = Uri.fromFile(sdImageMainDirectory);
Intent intent = new Intent("android.media.action.IMAGE_CAPTURE");
intent.putExtra(MediaStore.EXTRA_OUTPUT, outputFileUri);
startActivityForResult(intent, 0);
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
switch (resultCode) {
case 0:
finish();
break;
case -1:
try {
StoreImage(this, Uri.parse(data.toURI()),
sdImageMainDirectory);
} catch (Exception e) {
e.printStackTrace();
}
finish();
startActivity(new Intent("com.piit.lbp.form.LBPFORMADD"));
}
}
@Override
protected void onRestoreInstanceState(Bundle savedInstanceState) {
if (savedInstanceState.getBoolean(CameraCapture.PHOTO_TAKEN)) {
_taken = true;
}
}
@Override
protected void onSaveInstanceState(Bundle outState) {
outState.putBoolean(CameraCapture.PHOTO_TAKEN, _taken);
}
public static void StoreImage(Context mContext, Uri imageLoc, File imageDir) {
Bitmap bm = null;
try {
bm = Media.getBitmap(mContext.getContentResolver(), imageLoc);
bmGray = toGrayScale(bm);
FileOutputStream out = new FileOutputStream(imageDir);
bm.compress(Bitmap.CompressFormat.JPEG, 100, out);
bm.recycle();
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} catch (Exception e) {
e.printStackTrace();
}
}
問題:什麼是「位圖bm」 - 像RGB_565或其他?和多少位。
之前壓縮位圖到jpeg我所說的RGB到灰度方法用下面的代碼
public static Bitmap toGrayscale(Bitmap bmpOriginal)
{
int width, height;
height = bmpOriginal.getHeight();
width = bmpOriginal.getWidth();
Bitmap bmpGrayscale = Bitmap.createBitmap(width, height, Bitmap.Config.RGB_565);
Canvas c = new Canvas(bmpGrayscale);
Paint paint = new Paint();
ColorMatrix cm = new ColorMatrix();
cm.setSaturation(0);
ColorMatrixColorFilter f = new ColorMatrixColorFilter(cm);
paint.setColorFilter(f);
c.drawBitmap(bmpOriginal, 0, 0, paint);
return bmpGrayscale;
}
然後我想用bmGray用於應用LBP算。 問題:當您使用ColorMatrix轉換爲灰度時,它是每像素8位?
因爲我想將bmGray轉換爲Byte Array,並且一次只能提取1個字節。而且我想知道是否可以將灰度圖像轉換爲像素值的2d矩陣,我知道它已經是像素值的2d矩陣,但我該如何處理它...就像選擇像素值上下的像素當前像素。 ??
謝謝你的信息。 – 2012-03-30 14:11:04