目录
Normalize
ExtractMat
GCHandleType
Normalize
static float[] mean = { 0.485f, 0.456f, 0.406f };
static float[] std = { 0.229f, 0.224f, 0.225f };
public static void Normalize(Mat src)
{
src.ConvertTo(src, MatType.CV_32FC3, 1.0 / 255 );
Mat[] bgr = src.Split();
for (int i = 0; i < bgr.Length; ++i)
{
bgr[i].ConvertTo(bgr[i], MatType.CV_32FC1, 1 / std[i], (0.0 - mean[i]) / std[i]);
}
Cv2.Merge(bgr, src);
foreach (Mat channel in bgr)
{
channel.Dispose();
}
}ExtractMat
public static float[] ExtractMat(Mat src)
{
OpenCvSharp.Size size = src.Size();
int channels = src.Channels();
float[] result = new float[size.Width * size.Height * channels];
GCHandle resultHandle = default;
try
{
resultHandle = GCHandle.Alloc(result, GCHandleType.Pinned);
IntPtr resultPtr = resultHandle.AddrOfPinnedObject();
for (int i = 0; i < channels; ++i)
{
Mat cmat = new Mat(
src.Height, src.Width,
MatType.CV_32FC1,
resultPtr + i * size.Width * size.Height * sizeof(float));
Cv2.ExtractChannel(src, cmat, i);
cmat.Dispose();
}
}
finally
{
resultHandle.Free();
}
return result;
}static float[] mean = { 0.485f, 0.456f, 0.406f };
static float[] std = { 0.229f, 0.224f, 0.225f };
public static void Normalize(Mat src)
{
src.ConvertTo(src, MatType.CV_32FC3, 1.0 / 255 );
Mat[] bgr = src.Split();
for (int i = 0; i < bgr.Length; ++i)
{
bgr[i].ConvertTo(bgr[i], MatType.CV_32FC1, 1 / std[i], (0.0 - mean[i]) / std[i]);
}
Cv2.Merge(bgr, src);
foreach (Mat channel in bgr)
{
channel.Dispose();
}
}
public static float[] ExtractMat(Mat src)
{
OpenCvSharp.Size size = src.Size();
int channels = src.Channels();
float[] result = new float[size.Width * size.Height * channels];
GCHandle resultHandle = default;
try
{
resultHandle = GCHandle.Alloc(result, GCHandleType.Pinned);
IntPtr resultPtr = resultHandle.AddrOfPinnedObject();
for (int i = 0; i < channels; ++i)
{
Mat cmat = new Mat(
src.Height, src.Width,
MatType.CV_32FC1,
resultPtr + i * size.Width * size.Height * sizeof(float));
Cv2.ExtractChannel(src, cmat, i);
cmat.Dispose();
}
}
finally
{
resultHandle.Free();
}
return result;
}GCHandleType
Normal：对象被标记为完全不被GC管理的状态，但会被GC移动内存位置，需要我们手动调用Free来释放对应的GC对象
Pinned：对象被标记为完全不被GC管理的状态，不被GC回收也不被GC移动内存地址，需要我们手动调用Free来释放对应的GC对象
Weak：如果对象被标记为“不可达”（没有被任何对象使用，需要清除的状态）时（但是其对象的内存还未真的被回收），Weak所指向的对象就会标记为null；不需要我们手动调用Free来释放对应的GC对象
WeakTrackResurrection：如果对象在最終處理期間重新恢復狀態控制代碼不歸零；也就是说只有GC对象最终被回收，在此之前，我们都能够通过Handle获取到实际对象，不需要我们手动调用Free来释放对应的GC对象
