private void Init() { _windowDC = User.GetWindowDC(_windowHandle); // hdcSys _compatDC = Gdi.CreateCompatibleDC(_windowDC); // hdcMem BITMAPINFO bi = new BITMAPINFO(); bi.bmiHeader.Init(); bi.bmiHeader.biWidth = _rc.Width; bi.bmiHeader.biHeight = -_rc.Height; bi.bmiHeader.biPlanes = 1; bi.bmiHeader.biBitCount = 32; _bitmap = Gdi.CreateDIBSection(_windowDC, ref bi, DIBColors.DIB_RGB_COLORS, out _bitmapPixels, IntPtr.Zero, 0); IntPtr hOldBmp = Gdi.SelectObject(_compatDC, _bitmap); Gdi.DeleteObject(hOldBmp); _mat = new Image <Bgra, byte>(_rc.Width, _rc.Height, 0, _bitmapPixels); }