private async Task InitTextDetector(System.Net.DownloadProgressChangedEventHandler onDownloadProgressChanged = null)
{
if (_textDetector == null)
{
FileDownloadManager manager = new FileDownloadManager();
manager.AddFile(
"https://github.com/emgucv/models/raw/master/scene_text/DB_TD500_resnet50.onnx",
_modelFolderName,
"7B83A5E7AFBBD9D70313C902D188FF328656510DBF57D66A711E07DFDB81DF20");
manager.OnDownloadProgressChanged += onDownloadProgressChanged;
await manager.Download();
if (manager.AllFilesDownloaded)
{
_textDetector = new TextDetectionModel_DB(manager.Files[0].LocalFile);
_textDetector.BinaryThreshold = 0.3f;
_textDetector.PolygonThreshold = 0.5f;
_textDetector.MaxCandidates = 200;
_textDetector.UnclipRatio = 2.0;
_textDetector.SetInputScale(1.0 / 255.0);
_textDetector.SetInputSize(new Size(736, 736));
_textDetector.SetInputMean(new MCvScalar(122.67891434, 116.66876762, 104.00698793));
/*
* if (Emgu.CV.Cuda.CudaInvoke.HasCuda)
* {
* _vehicleAttrRecognizer.SetPreferableBackend(Emgu.CV.Dnn.Backend.Cuda);
* _vehicleAttrRecognizer.SetPreferableTarget(Emgu.CV.Dnn.Target.Cuda);
* }*/
}
}
}
/// <summary>
/// Release the memory associated with this scene text detector.
/// </summary>
protected override void DisposeObject()
{
if (_textDetector != null)
{
_textDetector.Dispose();
_textDetector = null;
}
if (_ocr != null)
{
_ocr.Dispose();
_ocr = null;
}
if (_freetype != null)
{
_freetype.Dispose();
_freetype = null;
}
}
/// <summary>
/// Clear and reset the model. Required Init function to be called again before calling ProcessAndRender.
/// </summary>
public void Clear()
{
if (_textDetector != null)
{
_textDetector.Dispose();
_textDetector = null;
}
if (_ocr != null)
{
_ocr.Dispose();
_ocr = null;
}
if (_freetype != null)
{
_freetype.Dispose();
_freetype = null;
}
}