Tracking algorithm with metro

Question

Hi,

well, I've developed a tracking algorithm, and I want to implement it with metro ... my question is ... how do I get a stream of images from the camera  (i need the pixeldata) and show them ? I tried to search for this ... all I could find is using MFC .. which doesn't help me ...

any idea how can I get this pixel data stream from the camera do some manipulation and show it to the user ?

Answer 1

Hi BlacKICce,

You've posted a question in the Metro Style Applications Israeli forum. All questions here should be asked in Hebrew language.

For this time only, I'll pass and provide you with an answer.

First, I understand that you're familiar with C++ since you've mentioned MFC, and this is good, since for your solution, I highly recommend using C++ and not C# for Video processing.

In general, to capture Video from a video device into a file or a stream, you should use the:

Windows::Media::Capture::MediaCapture type. Specifically you should call the StartRecordToStreamAsync method.

There is a great sample in the SDK which you can download from here:

http://code.msdn.microsoft.com/windowsapps/media-capture-sample-adf87622

Hope this help.

Tomer Shamam,

CodeValue

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Answer 2

Hi,

There are several ways to read Video File:

1. IRandomAccessStream fileStream = await file.OpenAsync(FileAccessMode.Read);

2. Convert stream to byte array -

using (MemoryStream zipMemoryStream = new MemoryStream(WindowsRuntimeBufferExtensions.ToArray(await FileIO.ReadBufferAsync(mainFile))))
{
}

3. Data Reader

        private async Task ReadVideoPath()
        {
            try
            {
                StorageFile sampleFile = await ApplicationData.Current.LocalFolder.GetFileAsync(videoDataFilename);
                using (IRandomAccessStream readStream = await sampleFile.OpenAsync(FileAccessMode.Read))
                {
                    // Read the file to an IInputStream stream, then get and load the DataReader.
                    using (IInputStream inputStream = (IInputStream)readStream)
                    {
                        using (DataReader dataReader = new DataReader(inputStream))
                        {
                            uint numBytesLoaded = await dataReader.LoadAsync((uint)readStream.Size);
                            videoFile = dataReader.ReadString(numBytesLoaded);
                        }
                    }
                }
            }
            catch (System.IO.FileNotFoundException)
            {
                // photoDataFilename not found
            }
        }

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Please mark the replies as answers if they help and unmark them if they provide no help.
My blog: blogs.microsoft.co.il/blogs/shair

Answer 3

Thanks for your answer, but it's not relevant since the question was "how do I get a stream of images from the camera". Not from a file.

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