这是我将帧/图像保存到硬盘的代码。
我将图像旋转两次，一次 180 度，然后再一次 90 度。
但是视频显示女人从左到右走，但在旋转后，我在图片框中看到它，使用 trackBar 滚动从右到左像镜子一样移动。
这是旋转后的样子：
她开始从右到左走，她的脸朝左看，而原来的应该是从左到右。
这就是我将它旋转到 180 度时的样子，这也是它在原始视频文件中的样子：
我想要的是看到她在第一张图片中的样子，但从左到右走是应该的。就像在第二张图片中她的脸点对了！
这是我正在使用的代码：
int ISampleGrabberCB.BufferCB(double sampleTime, IntPtr pBuffer, int bufferLen)
{
using (var bitmap = new Bitmap(_width, _height, _width * 3, PixelFormat.Format24bppRgb, pBuffer))
{
bitmap.RotateFlip(RotateFlipType.Rotate180FlipX);
// bitmap.RotateFlip(RotateFlipType.Rotate90FlipX);
if (SaveToDisc)
{
String tempFile = _outFolder+ _frameId.ToString("D6") + ".bmp";
if (File.Exists(tempFile))
{
if (lbl1.InvokeRequired)
{
lbl1.Invoke(new MethodInvoker(delegate { lbl1.Text = _frameId.ToString(); }));
}
}
else
{
bitmap.Save(Path.Combine(_outFolder, _frameId.ToString("D6") + ".bmp"));
if (lbl1.InvokeRequired)
{
lbl1.Invoke(new MethodInvoker(delegate { lbl1.Text = _frameId.ToString(); }));
}
}
_frameId++;
}
else
{
if (Images == null)
Images = new List<Bitmap>();
Images.Add((Bitmap)bitmap.Clone());
}
}
return 0;
}
现在我将它旋转一次 180 度，我尝试将其再旋转 90 度，然后再旋转 180 度，但它没有用。
我想将第二张图像向右旋转 90 度，所以我尝试了一下：
bitmap.RotateFlip(RotateFlipType.Rotate90FlipX);
但它没有做到。
我该怎么做 ？
我现在尝试使用此功能进行旋转：
public static Image RotateImage(Image img, float rotationAngle)
{
//create an empty Bitmap image
Bitmap bmp = new Bitmap(img.Width, img.Height);
//turn the Bitmap into a Graphics object
Graphics gfx = Graphics.FromImage(bmp);
//now we set the rotation point to the center of our image
gfx.TranslateTransform((float)bmp.Width / 2, (float)bmp.Height / 2);
//now rotate the image
gfx.RotateTransform(rotationAngle);
gfx.TranslateTransform(-(float)bmp.Width / 2, -(float)bmp.Height / 2);
//set the InterpolationMode to HighQualityBicubic so to ensure a high
//quality image once it is transformed to the specified size
gfx.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.HighQualityBicubic;
//now draw our new image onto the graphics object
gfx.DrawImage(img, new Point(0, 0));
//dispose of our Graphics object
gfx.Dispose();
//return the image
return bmp;
}
然后我像这样使用它：
Bitmap t = new Bitmap(RotateImage(bitmap, 180));
t.Save(Path.Combine(_outFolder, _frameId.ToString("D6") + ".bmp"));
但它不会向右旋转 180 或 90 度！它使它成为镜像。如果她的脸指向右侧的第二张图像，我想将图像向右旋转 90 度，这样她的脸就会向右站立！但相反，我一直认为她的脸像镜子一样向左。
为什么 ？
这是从视频文件中提取帧并将其保存到硬盘的类：
using System;
using System.Diagnostics;
using System.Drawing;
using System.Drawing.Imaging;
using System.IO;
using System.Runtime.InteropServices;
using DirectShowLib;
using System.Windows.Forms;
using System.Collections.Generic;
using System.Drawing;
namespace Polkan.DataSource
{
internal class WmvAdapter : ISampleGrabberCB, IDisposable
{
#region Fields
//public Image img;
private IFilterGraph2 _filterGraph;
private IMediaControl _mediaCtrl;
private IMediaEvent _mediaEvent;
private int _width;
private int _height;
private readonly string _outFolder;
private int _frameId;
private Label lbl1;
public bool done;
#endregion
#region Constructors and Destructors
public WmvAdapter(string file, string outFolder , Label lbl)
{
_outFolder = outFolder;
lbl1 = lbl;
try
{
SetupGraph(file);
}
catch
{
Dispose();
MessageBox.Show("A codec is required to load this video file. Please use http://www.headbands.com/gspot/ or search the web for the correct codec");
throw;
}
}
~WmvAdapter()
{
CloseInterfaces();
}
#endregion
public void Dispose()
{
CloseInterfaces();
}
public void Start()
{
int hr = _mediaCtrl.Run();
WaitUntilDone();
DsError.ThrowExceptionForHR(hr);
}
public void WaitUntilDone()
{
int hr;
const int eAbort = unchecked((int)0x80004004);
do
{
System.Windows.Forms.Application.DoEvents();
EventCode evCode;
hr = _mediaEvent.WaitForCompletion(100, out evCode);
} while
(hr == eAbort);
DsError.ThrowExceptionForHR(hr);
lbl1.ForeColor = Color.Red;
lbl1.Invoke(new MethodInvoker(delegate { lbl1.Text = _frameId.ToString(); }));
done = true;
}
/// <summary> build the capture graph for grabber. </summary>
private void SetupGraph(string file)
{
ISampleGrabber sampGrabber = null;
IBaseFilter capFilter = null;
IBaseFilter nullrenderer = null;
_filterGraph = (IFilterGraph2)new FilterGraph();
_mediaCtrl = (IMediaControl)_filterGraph;
_mediaEvent = (IMediaEvent)_filterGraph;
var mediaFilt = (IMediaFilter)_filterGraph;
try
{
// Add the video source
int hr = _filterGraph.AddSourceFilter(file, "Ds.NET FileFilter", out capFilter);
DsError.ThrowExceptionForHR(hr);
// Get the SampleGrabber interface
sampGrabber = new SampleGrabber() as ISampleGrabber;
var baseGrabFlt = sampGrabber as IBaseFilter;
ConfigureSampleGrabber(sampGrabber);
// Add the frame grabber to the graph
hr = _filterGraph.AddFilter(baseGrabFlt, "Ds.NET Grabber");
DsError.ThrowExceptionForHR(hr);
// ---------------------------------
// Connect the file filter to the sample grabber
// Hopefully this will be the video pin, we could check by reading it's mediatype
IPin iPinOut = DsFindPin.ByDirection(capFilter, PinDirection.Output, 0);
// Get the input pin from the sample grabber
IPin iPinIn = DsFindPin.ByDirection(baseGrabFlt, PinDirection.Input, 0);
hr = _filterGraph.Connect(iPinOut, iPinIn);
DsError.ThrowExceptionForHR(hr);
// Add the null renderer to the graph
nullrenderer = new NullRenderer() as IBaseFilter;
hr = _filterGraph.AddFilter(nullrenderer, "Null renderer");
DsError.ThrowExceptionForHR(hr);
// ---------------------------------
// Connect the sample grabber to the null renderer
iPinOut = DsFindPin.ByDirection(baseGrabFlt, PinDirection.Output, 0);
iPinIn = DsFindPin.ByDirection(nullrenderer, PinDirection.Input, 0);
hr = _filterGraph.Connect(iPinOut, iPinIn);
DsError.ThrowExceptionForHR(hr);
// Turn off the clock. This causes the frames to be sent
// thru the graph as fast as possible
hr = mediaFilt.SetSyncSource(null);
DsError.ThrowExceptionForHR(hr);
// Read and cache the image sizes
SaveSizeInfo(sampGrabber);
}
finally
{
if (capFilter != null)
{
Marshal.ReleaseComObject(capFilter);
}
if (sampGrabber != null)
{
Marshal.ReleaseComObject(sampGrabber);
}
if (nullrenderer != null)
{
Marshal.ReleaseComObject(nullrenderer);
}
GC.Collect();
}
}
private void SaveSizeInfo(ISampleGrabber sampGrabber)
{
// Get the media type from the SampleGrabber
var media = new AMMediaType();
int hr = sampGrabber.GetConnectedMediaType(media);
DsError.ThrowExceptionForHR(hr);
if ((media.formatType != FormatType.VideoInfo) || (media.formatPtr == IntPtr.Zero))
{
throw new NotSupportedException("Unknown Grabber Media Format");
}
// Grab the size info
var videoInfoHeader = (VideoInfoHeader)Marshal.PtrToStructure(media.formatPtr, typeof(VideoInfoHeader));
_width = videoInfoHeader.BmiHeader.Width;
_height = videoInfoHeader.BmiHeader.Height;
DsUtils.FreeAMMediaType(media);
GC.Collect();
}
private void ConfigureSampleGrabber(ISampleGrabber sampGrabber)
{
var media = new AMMediaType
{
majorType = MediaType.Video,
subType = MediaSubType.RGB24,
formatType = FormatType.VideoInfo
};
int hr = sampGrabber.SetMediaType(media);
DsError.ThrowExceptionForHR(hr);
DsUtils.FreeAMMediaType(media);
GC.Collect();
hr = sampGrabber.SetCallback(this, 1);
DsError.ThrowExceptionForHR(hr);
}
private void CloseInterfaces()
{
try
{
if (_mediaCtrl != null)
{
_mediaCtrl.Stop();
_mediaCtrl = null;
}
}
catch (Exception ex)
{
Debug.WriteLine(ex);
}
if (_filterGraph != null)
{
Marshal.ReleaseComObject(_filterGraph);
_filterGraph = null;
}
GC.Collect();
}
int ISampleGrabberCB.SampleCB(double sampleTime, IMediaSample pSample)
{
Marshal.ReleaseComObject(pSample);
return 0;
}
//add a boolean property to indicate the save-mode
public bool SaveToDisc { get; set; }
//the list for the bitmaps
public List<Bitmap> Images { get; set; }
int ISampleGrabberCB.BufferCB(double sampleTime, IntPtr pBuffer, int bufferLen)
{
using (var bitmap = new Bitmap(_width, _height, _width * 3, PixelFormat.Format24bppRgb, pBuffer))
{
//bitmap.RotateFlip(RotateFlipType.RotateNoneFlipXY);
// bitmap.RotateFlip(RotateFlipType.Rotate90FlipX);
// Bitmap t = new Bitmap(RotateImage(bitmap, 180));
if (SaveToDisc)
{
String tempFile = _outFolder+ _frameId.ToString("D6") + ".bmp";
if (File.Exists(tempFile))
{
if (lbl1.InvokeRequired)
{
lbl1.Invoke(new MethodInvoker(delegate { lbl1.Text = _frameId.ToString(); }));
}
}
else
{
bitmap.Save(Path.Combine(_outFolder, _frameId.ToString("D6") + ".bmp"));
if (lbl1.InvokeRequired)
{
lbl1.Invoke(new MethodInvoker(delegate { lbl1.Text = _frameId.ToString(); }));
}
}
_frameId++;
}
else
{
if (Images == null)
Images = new List<Bitmap>();
Images.Add((Bitmap)bitmap.Clone());
}
}
return 0;
}
public static Image RotateImage(Image img, float rotationAngle)
{
//create an empty Bitmap image
Bitmap bmp = new Bitmap(img.Width, img.Height);
//turn the Bitmap into a Graphics object
Graphics gfx = Graphics.FromImage(bmp);
//now we set the rotation point to the center of our image
gfx.TranslateTransform((float)bmp.Width / 2, (float)bmp.Height / 2);
//now rotate the image
gfx.RotateTransform(rotationAngle);
gfx.TranslateTransform(-(float)bmp.Width / 2, -(float)bmp.Height / 2);
//set the InterpolationMode to HighQualityBicubic so to ensure a high
//quality image once it is transformed to the specified size
gfx.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.HighQualityBicubic;
//now draw our new image onto the graphics object
gfx.DrawImage(img, new Point(0, 0));
//dispose of our Graphics object
gfx.Dispose();
//return the image
return bmp;
}
/*int ISampleGrabberCB.BufferCB(double sampleTime, IntPtr pBuffer, int bufferLen)
{
using (var bitmap = new Bitmap(_width, _height, _width * 3, PixelFormat.Format24bppRgb, pBuffer))
{
bitmap.RotateFlip(RotateFlipType.Rotate180FlipX);
MemoryStream myStream = new MemoryStream(1000000);
bitmap.Save(myStream, ImageFormat.Bmp);
//bitmap.Save(Path.Combine(_outFolder, _frameId + ".bmp"));
img = new Bitmap(myStream);
}
return 0;
}*/
}
}
在 Form1 中，我使用这样的类：
private void button5_Click(object sender, EventArgs e)
{
button5.Enabled = false;
button1.Enabled = false;
wmv = new Polkan.DataSource.WmvAdapter(@"d:\VIDEO0040.3gp", sf,label2);
wmv.SaveToDisc = true;
wmv.Start();
if (wmv.done == true)
{
button1.Enabled = true;
}
}