/// <summary>
/// Сохранение видео как набора ключевых кадров
/// </summary>
/// <param name="video">Видео</param>
/// <param name="pen">Кисть для отрисовки границ текстовых областей</param>
/// <param name="fileName">Путь для сохранения</param>
/// <param name="framesSubDir">Имя директории для сохранения ключевых кадров</param>
/// <param name="frameExpansion">Расширение кадра</param>
public Task<bool> SaveVideoAsync(GreyVideo video, System.Drawing.Pen pen, string fileName, string framesSubDir, string framesExpansion)
{
try
{
if (video == null)
throw new ArgumentNullException("Null video");
if (fileName == null || fileName.Length == 0)
throw new ArgumentNullException("Null pathToSave");
if (framesSubDir == null || framesSubDir.Length == 0)
throw new ArgumentNullException("Null framesSubDir");
if (framesExpansion == null || framesExpansion.Length == 0)
throw new ArgumentNullException("Null framesExpansion");
if (pen == null)
throw new ArgumentNullException("Null pen");
return Task.Run(() =>
{
SaveVideoFrames(video, pen, fileName, framesSubDir, framesExpansion);
return true;
});
}
catch (Exception exception)
{
throw exception;
}
}
/// <summary>
/// Запись инфориации о текстовых блоках видеопотока в XML - файл
/// </summary>
/// <param name="video">Видео</param>
/// <param name="fileName">Имя файла</param>
/// <returns>true</returns>
public static Task<bool> WriteTextBlocksInformation(GreyVideo video, string fileName)
{
if (video == null || video.Frames == null)
throw new ArgumentNullException("Null video in WriteTextBlocksInformation");
if (fileName == null || fileName.Length == 0)
throw new ArgumentNullException("Null fileName in WriteTextBlocksInformation");
try
{
return Task.Run(() =>
{
XmlWriterSettings settings = new XmlWriterSettings();
settings.Indent = true;
settings.IndentChars = "\t";
System.Xml.XmlWriter xmlWriter = System.Xml.XmlWriter.Create(fileName, settings);
xmlWriter.WriteStartDocument();
xmlWriter.WriteStartElement("Video");
for (int i = 0; i < video.Frames.Count; i++)
XMLWriter.WriteTextBlocksInformation(video.Frames[i].Frame.TextRegions, xmlWriter, video.Frames[i].FrameNumber, fileName);
xmlWriter.WriteEndDocument();
xmlWriter.Flush();
xmlWriter.Close();
return true;
});
}
catch (Exception exception)
{
throw exception;
}
}
/// <summary>
/// Сохранение обработанных ключевых кадров видео
/// </summary>
/// <param name="video">Видео</param>
/// <param name="pen">Кисть для выделения текстовых областей</param>
/// <param name="fileName">Путь к сохранению</param>
/// <param name="framesSubDir">Имя директории для сохранения ключевых кадров</param>
/// <param name="frameExpansion">Расширение кадра</param>
private void SaveVideoFrames(GreyVideo video, System.Drawing.Pen pen, string fileName, string framesSubDir, string frameExpansion)
{
try
{
if (video.Frames != null)
{
int framesNumber = video.Frames.Count;
string framesDirName = Path.Combine(fileName, framesSubDir);
if (!Directory.Exists(framesDirName))
Directory.CreateDirectory(framesDirName);
for (int i = 0; i < framesNumber; i++)
{
string frameFileName = Path.Combine(framesDirName, i.ToString() + frameExpansion);
SaveVideoFrameAsync(video.Frames[i], pen, frameFileName);
if (i == framesNumber - 1)
videoFrameSavedEvent(i, true);
else
videoFrameSavedEvent(i, false);
}
}
}
catch (Exception exception)
{
throw exception;
}
}
/// <summary>
/// Выделение текста на кд\лючевых кадрах видеоролика
/// </summary>
/// <param name="video">Видеоролик</param>
/// <returns>true</returns>
public Task<bool> DetectText(GreyVideo video, int threadsNumber)
{
try
{
if (video == null)
throw new ArgumentNullException("Null video in DetectText");
if (video.Frames == null)
throw new ArgumentNullException("Null video frames in DetectText");
return Task.Run(() =>
{
for (int i = 0; i < video.Frames.Count; i++)
if (video.Frames[i].NeedProcess)
{
EdgeDetectionFilter sobel = new SobelFilter();
SmoothingFilter gauss = new GaussFilter(this.GaussFilterSize, this.GaussFilterSigma);
GradientFilter gradientFiler = new SimpleGradientFilter();
CannyEdgeDetection canny = new CannyEdgeDetection(gauss, sobel, this.CannyLowTreshold, this.CannyHighTreshold);
SWTTextDetection SWTTextDetection = new SWTTextDetection(canny, null, gradientFiler, this.VarienceAverageSWRation,
this.AspectRatio, this.DiamiterSWRatio, this.BbPixelsNumberMinRatio, this.BbPixelsNumberMaxRatio, this.ImageRegionHeightRationMin,
this.ImageRegionWidthRatioMin, this.PairsHeightRatio, this.PairsIntensityRatio, this.PairsSWRatio,
this.PairsWidthDistanceSqrRatio, this.PairsOccupationRatio, this.MinLettersNumberInTextRegion, this.MergeByDirectionAndChainEnds);
SWTTextDetection.DetectText(video.Frames[i].Frame, threadsNumber);
}
return true;
});
}
catch (Exception exception)
{
throw exception;
}
}
/// <summary>
/// Загрузка видео
/// </summary>
private async void LoadVideoFileFunction()
{
try
{
this.video = new GreyVideo();
progressWindow = ProgressWindow.InitializeProgressWindow();
OkButtonWindow okButtonWindow = OkButtonWindow.InitializeOkButtonWindow();
OpenFileDialog dialog = new OpenFileDialog();
dialog.Filter = "MP4 Image (.mp4)|*.mp4|3gp (.3gp)|*.3gp|Avi (.avi)|*.avi";
dialog.ShowDialog();
FrameSizeWindow frameSizeWindow = FrameSizeWindow.InitializeFrameSizeWindow();
frameSizeWindow.capitalText.Text = PARAMETERS_SETTING_STRING;
frameSizeWindow.ShowDialog();
FrameSizeViewModel frameSizeViewModel = (FrameSizeViewModel)frameSizeWindow.DataContext;
progressWindow.capitalText.Text = LOAD_VIDEO_STRING;
progressWindow.textInformation.Text = VIDEO_INITIALIZATION_STRING;
progressWindow.Show();
string videoFilePath = System.IO.Path.GetDirectoryName(dialog.FileName);
string videoFileName = System.IO.Path.GetFileNameWithoutExtension(dialog.FileName);
string keyFramesInormatyionFilePath = System.IO.Path.Combine(videoFilePath, videoFileName + ".txt");
IOData ioData = new IOData() { FileName = dialog.FileName, FrameHeight = frameSizeViewModel.FrameHeight, FrameWidth = frameSizeViewModel.FrameWidth };
VideoLoader videoLoader = new VideoLoader();
int framesNumber = await videoLoader.CountFramesNumberAsync(ioData);
progressWindow.pbStatus.SmallChange = (double)progressWindow.pbStatus.Maximum / (double)framesNumber;
/// Если существует файл с информацией о ключевых кадрах
if (System.IO.File.Exists(keyFramesInormatyionFilePath))
{
FileReader fileReader = new FileReader();
FileReader.ExceptionOccuredEvent += this.ExceptionOccuredEventHandler;
keyFrameIOInformation = await fileReader.ReadKeyFramesInformationAsync(keyFramesInormatyionFilePath, frameSizeViewModel.FrameWidth, frameSizeViewModel.FrameHeight);
ioData.KeyFrameIOInformation = keyFrameIOInformation;
// EdgeBasedKeyFrameExtractor.keyFrameExtractedEvent += this.KeyFramesExtractionProcessing;
// EdgeBasedKeyFrameExtractor edgeBasedKeyFrameExtractor = new EdgeBasedKeyFrameExtractor();
// this.video.Frames = await edgeBasedKeyFrameExtractor.ExtractKeyFramesByListNumberAsync(ioData);
}
else /// Если нет, то выделяем кадры алгоритмически
{
EdgeBasedKeyFrameExtractor.keyFrameExtractedEvent += this.KeyFramesExtractionProcessing;
EdgeBasedKeyFrameExtractor.framesDifferenceEvent += this.FramesDifferenceCalculateProcessing;
EdgeBasedKeyFrameExtractor edgeBasedKeyFrameExtractor = new EdgeBasedKeyFrameExtractor();
this.video.Frames = await edgeBasedKeyFrameExtractor.ExtractKeyFramesTwoPassAsync(ioData);
}
okButtonWindow = OkButtonWindow.InitializeOkButtonWindow();
okButtonWindow.capitalText.Text = LOAD_VIDEO_STRING;
okButtonWindow.textInformation.Text = LOAD_VIDEO_SUCCESS_STRING;
okButtonWindow.ShowDialog();
progressWindow.Close();
this.VideoFileName = new Uri(dialog.FileName);
this.videoFileNameString = dialog.FileName;
this.MediaPlayerNavigationVisibility = Visibility.Visible;
this.VideoWasNotLoaded = Visibility.Hidden;
this.IsVideoFrameTabSelected = false;
this.IsProcessedVideoFramesTabSelected = false;
this.IsProcessedVideoFrameTabSelected = false;
this.IsVideoTabSelected = true;
}
catch (Exception exception)
{
progressWindow.Hide();
ShowExceptionMessage(exception.Message);
}
}
