zeero :
The calling thread cannot access this object because a different thread owns it even after adding Dispatcher.Invoke.
The problem is still intact even after adding Dispatcher.Invoke.
async Task capturePredict()
{
await Dispatcher.Invoke( async () =>
{
PngBitmapEncoder image = new PngBitmapEncoder();
image.Frames.Add(BitmapFrame.Create(bitmap));
using (Stream stream = File.Create(@"E:\ImageClassificationTraining\image.png"))
{
await Task.Run(() => image.Save(stream));
}
});
}
Clemens :
In contrast to decoding a BitmapSource (which can be frozen to make it cross-thread accessible), encoding can seemingly not be done in a thread other than the UI thread.
You may however separate the encoding step from writing the file, by something like this:
public async Task SaveImageAsync(BitmapSource bitmap, string path)
{
var encoder = new PngBitmapEncoder();
encoder.Frames.Add(BitmapFrame.Create(bitmap));
using (var memoryStream = new MemoryStream())
{
encoder.Save(memoryStream);
memoryStream.Position = 0;
using (var fileStream = File.Create(path))
{
await memoryStream.CopyToAsync(fileStream);
}
}
}
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