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我正在轉換字節組圖像到YuvImage在Android界面我xamarin廣告應用程式這樣如何xamarin的Android
public KeyValuePair<string, string> CaptureImageFromBarcode(byte[] bt, int width, int height)
{
Java.IO.FileOutputStream outStream = null;
Android.Graphics.YuvImage yuvimage = new Android.Graphics.YuvImage(bt, Android.Graphics.ImageFormat.Nv21, width, height,null);
MemoryStream baos = new MemoryStream();
yuvimage.CompressToJpeg(new Android.Graphics.Rect(0, 0, width, height), 80, baos);
var directory = Android.OS.Environment.GetExternalStoragePublicDirectory(Android.OS.Environment.DirectoryPictures);
string filenamefile = DateTime.Now.Ticks.ToString() + ".jpg";
string filename = System.IO.Path.Combine(directory.AbsolutePath, filenamefile);
outStream = new Java.IO.FileOutputStream(filename);
outStream.Write(baos.ToArray());
outStream.Close();
return new KeyValuePair<string, string>(filenamefile, filename);
}
在這裏，我將圖片保存到磁盤。但保存的圖像旋轉90度左旋YuvImage所以我想保存90度旋轉右圖像。我嘗試了一些代碼，但它沒有給我正確的輸出。
這是我試過的。
試圖代碼1：
private byte[] rotateYUV420Degree90(byte[] data, int imageWidth, int imageHeight)
{
byte[] yuv = new byte[imageWidth * imageHeight * 3/2];
// Rotate the Y luma
int i = 0;
for (int x = 0; x < imageWidth; x++)
{
for (int y = imageHeight - 1; y >= 0; y--)
{
yuv[i] = data[y * imageWidth + x];
i++;
}
}
// Rotate the U and V color components
i = imageWidth * imageHeight * 3/2 - 1;
for (int x = imageWidth - 1; x > 0; x = x - 2)
{
for (int y = 0; y < imageHeight/2; y++)
{
yuv[i] = data[(imageWidth * imageHeight) + (y * imageWidth) + x];
i--;
yuv[i] = data[(imageWidth * imageHeight) + (y * imageWidth) + (x - 1)];
i--;
}
}
return yuv;
}
試過代碼2：
public static byte[] rotateNV21(byte[] input, byte[] output, int width, int height, int rotation)
{
Boolean swap = (rotation == 90 || rotation == 270);
Boolean yflip = (rotation == 90 || rotation == 180);
Boolean xflip = (rotation == 270 || rotation == 180);
for (int x = 0; x < width; x++)
{
for (int y = 0; y < height; y++)
{
int xo = x, yo = y;
int w = width, h = height;
int xi = xo, yi = yo;
if (swap)
{
xi = w * yo/h;
yi = h * xo/w;
}
if (yflip)
{
yi = h - yi - 1;
}
if (xflip)
{
xi = w - xi - 1;
}
output[w * yo + xo] = input[w * yi + xi];
int fs = w * h;
int qs = (fs >> 2);
xi = (xi >> 1);
yi = (yi >> 1);
xo = (xo >> 1);
yo = (yo >> 1);
w = (w >> 1);
h = (h >> 1);
// adjust for interleave here
int ui = fs + (w * yi + xi) * 2;
int uo = fs + (w * yo + xo) * 2;
// and here
int vi = ui + 1;
int vo = uo + 1;
output[uo] = input[ui];
output[vo] = input[vi];
// return output;
}
}
return output;
}
試過代碼3：
public static void rotateY12toYUV420(byte[] input, byte[] output, int width, int height, int rotation)
{
Boolean swap = (rotation == 90 || rotation == 270);
Boolean flip = (rotation == 90 || rotation == 180);
for (int x = 0; x < width; x++)
{
for (int y = 0; y < height; y++)
{
int xo = x, yo = y;
int w = width, h = height;
int xi = xo, yi = yo;
if (swap)
{
xi = w * yo/h;
yi = h * xo/w;
}
if (flip)
{
xi = w - xi - 1;
yi = h - yi - 1;
}
output[w * yo + xo] = input[w * yi + xi];
int fs = w * h;
int qs = (fs >> 2);
xi = (xi >> 1);
yi = (yi >> 1);
xo = (xo >> 1);
yo = (yo >> 1);
w = (w >> 1);
int ui = fs + w * yi + xi;
int uo = fs + w * yo + xo;
int vi = qs + ui;
int vo = qs + uo;
output[uo] = input[vi];
output[vo] = input[ui];
}
}
}
試過代碼4：
public Bitmap rotateImage(int angle, Bitmap bitmapSrc)
{
Matrix matrix = new Matrix();
matrix.postRotate(angle);
return Bitmap.createBitmap(bitmapSrc, 0, 0,
bitmapSrc.getWidth(), bitmapSrc.getHeight(), matrix, true);
}
請幫忙。 謝謝。
你爲什麼想這樣做。您可以捕捉帶有旋轉的jpeg，而不是轉換成YUV。如果它的工作比它容易的方式 – DreamCoder
實際上這裏圖像（字節[] bt）我得到不是從camera.that我從條形碼掃描儀DLL的結果。所以它默認是旋轉的。 –
好吧，你用於條碼掃描的庫。該庫不提供旋轉功能？ – DreamCoder