C#•2y ago

✅ Installing Emgu CV

I've been trying installing Emgu.CV from NuGet but I've been facing this error, I've tried changing the .net framework but this error still occurs...any ideas how to solve it?

35 Replies

Nisay•2y ago

Hi, i am beginner programming in the c# Help me...

VRoseOP•2y ago

I need help myself 😅

Nisay•2y ago

Yes, i need help myself... I am adding a button for updating, deleting and examining the data retrieved via web form and sql server. How do we establish the id button relationship so that the relevant buttons reach the relevant records? Thank you.

Buddy•2y ago

Do not hijack someone else's thread @Nisay !

Buddy•2y ago

Make your own thread in #help by pressing this button

Nisay•2y ago

Thanks...

VRoseOP•2y ago

Thank you....

Buddy•2y ago

To bring back the original question

MODiX•2y ago

VRose#1239

I've been trying installing Emgu.CV from NuGet but I've been facing this error, I've tried changing the .net framework but this error still occurs...any ideas how to solve it?

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Klarth•2y ago

What versions did you try for .NET Framework? 4.61 would be the absolute min for that package, but realistically there's no reason to not use .NET Framework 4.8+. Ideally, you would be on .NET instead of .NET Framework. https://www.nuget.org/packages/Emgu.CV#supportedframeworks-body-tab is what should be supported.

VRoseOP•2y ago

Nvm, I was using an old version and it didn't work but I tried the last .NET version and the library installed sucessfully 👍 However, I still can't figure out how to use it. I've Emgu CV 4.6.0.5131 but I don't know an up to date examples of how to get started with this library. Most of the old tutorials point to installing the library manually, however even doing that didn't help since in the tutorials, installing the library manually gives them a bin that has all of the necessary .dll files but I'm not getting that when I successfully install Emgu CV manually Also, when I try to use the project that has the library installed through NuGet, I get the following error:

System.EntryPointNotFoundException: 'Unable to find an entry point named 'cveVideoCaptureReadToMat' in DLL 'cvextern'.'

System.EntryPointNotFoundException: 'Unable to find an entry point named 'cveVideoCaptureReadToMat' in DLL 'cvextern'.'

From the following code:

public partial class FacialRecognitionTest : Form
    {
        
        
        private VideoCapture _cameraCapture;
        private LBPHFaceRecognizer _faceRecognition;
        private CascadeClassifier _faceDetector;
        private Timer timer;
        IInputArray image;
        

        public FacialRecognitionTest()
        {
            InitializeComponent();
            
            // Initialize the camera capture
            _cameraCapture = new VideoCapture();
            _cameraCapture.Start();

// Start the timer to process frames from the camera feed
            timer = new Timer();
            timer.Interval = 1000;
            timer.Tick += new EventHandler(timer_Tick);
            timer.Start();
            
        }

private void timer_Tick(object sender, EventArgs e)
        {
            
            // Capture a frame from the camera
            var cameraFrame = _cameraCapture.QueryFrame();
            cameraBox.Image = cameraFrame.ToImage<Bgr, byte>().ToBitmap();
}

public partial class FacialRecognitionTest : Form
    {
        
        
        private VideoCapture _cameraCapture;
        private LBPHFaceRecognizer _faceRecognition;
        private CascadeClassifier _faceDetector;
        private Timer timer;
        IInputArray image;
        

        public FacialRecognitionTest()
        {
            InitializeComponent();
            
            // Initialize the camera capture
            _cameraCapture = new VideoCapture();
            _cameraCapture.Start();

// Start the timer to process frames from the camera feed
            timer = new Timer();
            timer.Interval = 1000;
            timer.Tick += new EventHandler(timer_Tick);
            timer.Start();
            
        }

private void timer_Tick(object sender, EventArgs e)
        {
            
            // Capture a frame from the camera
            var cameraFrame = _cameraCapture.QueryFrame();
            cameraBox.Image = cameraFrame.ToImage<Bgr, byte>().ToBitmap();
}

I'm not sure if I need to do add any references although I've installed it through NuGet + I don't have any .dll when installing the library manually...Also, I'm not quite sure if my code is correct or not 😅 @Klarth

Klarth•2y ago

Were you trying to upgrade/update an existing project? Or are you starting a new project with EmguCV?

VRoseOP•2y ago

I installed the library on an existing project but I started by installing Emgu CV through NuGet

Klarth•2y ago

So this is a project that previously didn't have any EmguCV-related code in it?

VRoseOP•2y ago

Yep

Klarth•2y ago

Klarth•2y ago

It looks like it manages native dependencies by separate packages. I'm not exactly sure how you're supposed to manage that per-build on your side.

VRoseOP•2y ago

Its documentation is really awful as well...

Klarth•2y ago

Stuff like Avalonia pulls everything and then filters, AFAIK. But it's probably too large for OpenCV. 🤷‍♂️ That's pretty much to be expected for science/AI-related stuff in .NET.

VRoseOP•2y ago

Are there any simpler or at least more well documented computer vision libraries for .NET? One that supports facial recognition? Or perhaps I should use "IronPython" to integrate a python script that does this into my .NET application?

Klarth•2y ago

I'd almost rather walk into a nest of spiders.

VRoseOP•2y ago

😅

Klarth•2y ago

Install the actual runtime dependencies you need. See what happens. Cascade classifiers are pretty old tech. I'm not sure if they're really used anymore in the application. 🤷‍♂️

VRoseOP•2y ago

I'm not even using that yet, I'm trying to just display the camera in a picturebox but this is not even working...It's opening the camera but then I get the error I shared earlier

VRoseOP•2y ago

Tried installing

Emgu.CV.runtime.windows

Emgu.CV.runtime.windows

but got the following error:

Klarth•2y ago

Your choices are basically: 1. EmguCV. 2. ML.NET (via YOLO trained ONNX model https://learn.microsoft.com/en-us/dotnet/machine-learning/tutorials/object-detection-onnx) 3. Maybe TensorFlow/PyTorch bindings? 🤷‍♂️ ARM?

VRoseOP•2y ago

I'm programming this on a x64 windows 11 computer, but weirdly the

Emgu.CV.runtime.ubuntu-x64

Emgu.CV.runtime.ubuntu-x64

got installed successfully 😅

Klarth•2y ago

VRoseOP•2y ago

You mean installing Emgu.TF?

Klarth•2y ago

Installs for me on Win10 / .NET 7

Klarth•2y ago

No, I mean finding some facial recognition model for python that's trained. Then port the prediction side to .NET's TensorFlow bindings. Also, if you're doing facial recognition (ie. "this face is Dave") with cascade classifiers, you're going to have a bad time. Facial tracking (ie. "this is a face") is about the best that tech could do, sometimes some facial features like position of eyes, nose, etc.

VRoseOP•2y ago

Alright but first I'd like to figure out how to display the camera feed in the first place so I deal with face detection & recognition later on

Klarth•2y ago

But that approach died when convolution neural networks came along.

VRoseOP•2y ago

Hmm so I'll try to find a way to achieve this using CNN instead, thank you for your advice

Accord•2y ago

Was this issue resolved? If so, run /close - otherwise I will mark this as stale and this post will be archived until there is new activity.

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✅ Installing Emgu CV