C# for Image Recognition and Classification


Image recognition and classification in C# often involve the use of machine learning models. In this example, we'll introduce the concept with a basic code snippet for image classification using ML.NET, a machine learning framework for .NET. A complete image classification solution would use more complex models and datasets.


Sample C# Code for Image Classification


Here's a basic example of C# code for image classification using ML.NET:


using System;
using System.Drawing;
using System.IO;
using Microsoft.ML;
using Microsoft.ML.Data;
class ImageData
{
    [LoadColumn(0)]
    public string ImagePath;
    [LoadColumn(1)]
    public string Label;
}
class ImagePrediction
{
    [ColumnName("PredictedLabel")]
    public string Label;
}
class Program
{
    static void Main()
    {
        var context = new MLContext();
        var data = context.Data.LoadFromTextFile<ImageData>("image_data.txt", separatorChar: ',');
        var pipeline = context.Transforms.Conversion.MapValueToKey("Label")
            .Append(context.Transforms.LoadImages("Image", "ImagePath"))
            .Append(context.Transforms.ResizeImages("Image", 224, 224))
            .Append(context.Transforms.ExtractPixels("Image"))
            .Append(context.Transforms.ApplyOnnxModel("Label", "Model.onnx"))
            .Append(context.Transforms.Conversion.MapKeyToValue("PredictedLabel"));
        var model = pipeline.Fit(data);
        var predictionEngine = context.Model.CreatePredictionEngine<ImageData, ImagePrediction>(model);
        var imageFilePath = "sample_image.jpg";
        var imageData = new ImageData { ImagePath = imageFilePath };
        var prediction = predictionEngine.Predict(imageData);
        Console.WriteLine("Image Classification Result:");
        Console.WriteLine($"Image: {imageData.ImagePath}");
        Console.WriteLine($"Predicted Label: {prediction.Label}");
    }
}

This code uses a pre-trained ONNX model for image classification. You need to replace "image_data.txt," "Model.onnx," and "sample_image.jpg" with your own dataset, model, and image. ML.NET simplifies the process of working with machine learning models in C#.


Sample HTML Image Preview


Below is a simple HTML element to preview the image:


Sample Image