C#でWebカメラを使用したバーコードスキャナを構築する

dotnet add package OpenCvSharp4.Windows
dotnet add package OpenCvSharp4.Extensions
dotnet add package BarCode

```
dotnet add package OpenCvSharp4.Windows
dotnet add package OpenCvSharp4.Extensions
dotnet add package BarCode
```

using OpenCvSharp;
using OpenCvSharp.Extensions;
using IronBarCode;
using IronSoftware.Drawing;
// Open the default camera (device index 0)
using var capture = new VideoCapture(0);
if (!capture.IsOpened())
{
    Console.WriteLine("No camera found. Check connected devices.");
    return;
}
// Configure the barcode reader for real-time scanning
var options = new BarcodeReaderOptions
{
    ExpectMultipleBarcodes = false,
    ExpectBarcodeTypes = BarcodeEncoding.All,
    Speed = ReadingSpeed.Faster
};
Console.WriteLine("Barcode scanner active. Press 'Q' to quit.");
using var frame = new Mat();
bool scanning = true;
while (scanning)
{
    capture.Read(frame);
    if (frame.Empty())
        continue;
    // Convert the captured frame to a bitmap for barcode processing
    var bitmap = BitmapConverter.ToBitmap(frame);
    var anyBitmap = new AnyBitmap(bitmap);
    // Scan the frame for barcodes
    var results = BarcodeReader.Read(anyBitmap, options);
    foreach (var result in results)
    {
        Console.WriteLine($"Barcode detected: {result.Value}");
        Console.WriteLine($"  Format: {result.BarcodeType}");
        // Save a snapshot of the frame where the barcode was found
        bitmap.Save("barcode_snapshot.png");
        Console.WriteLine("  Snapshot saved to barcode_snapshot.png");
    }
    // Check for quit key
    if (Cv2.WaitKey(1) == 'q')
        scanning = false;
}
Console.WriteLine("Scanner stopped.");

Imports OpenCvSharp
Imports OpenCvSharp.Extensions
Imports IronBarCode
Imports IronSoftware.Drawing

' Open the default camera (device index 0)
Using capture As New VideoCapture(0)
    If Not capture.IsOpened() Then
        Console.WriteLine("No camera found. Check connected devices.")
        Return
    End If

    ' Configure the barcode reader for real-time scanning
    Dim options As New BarcodeReaderOptions With {
        .ExpectMultipleBarcodes = False,
        .ExpectBarcodeTypes = BarcodeEncoding.All,
        .Speed = ReadingSpeed.Faster
    }
    Console.WriteLine("Barcode scanner active. Press 'Q' to quit.")

    Using frame As New Mat()
        Dim scanning As Boolean = True
        While scanning
            capture.Read(frame)
            If frame.Empty() Then
                Continue While
            End If

            ' Convert the captured frame to a bitmap for barcode processing
            Dim bitmap = BitmapConverter.ToBitmap(frame)
            Dim anyBitmap As New AnyBitmap(bitmap)

            ' Scan the frame for barcodes
            Dim results = BarcodeReader.Read(anyBitmap, options)
            For Each result In results
                Console.WriteLine($"Barcode detected: {result.Value}")
                Console.WriteLine($"  Format: {result.BarcodeType}")

                ' Save a snapshot of the frame where the barcode was found
                bitmap.Save("barcode_snapshot.png")
                Console.WriteLine("  Snapshot saved to barcode_snapshot.png")
            Next

            ' Check for quit key
            If Cv2.WaitKey(1) = AscW("q"c) Then
                scanning = False
            End If
        End While
    End Using
End Using

Console.WriteLine("Scanner stopped.")

using IronBarCode;
// Optimized options for scanning QR codes from a camera feed
var qrOptions = new BarcodeReaderOptions
{
    ExpectMultipleBarcodes = true,
    ExpectBarcodeTypes = BarcodeEncoding.QRCode | BarcodeEncoding.PDF417,
    Speed = ReadingSpeed.Detailed,
    AutoRotate = true
};
// Decode barcodes from a saved image captured by the webcam
var imageResults = BarcodeReader.Read("barcode_snapshot.png", qrOptions);
foreach (var barcode in imageResults)
{
    Console.WriteLine($"Data: {barcode.Value}");
    Console.WriteLine($"Type: {barcode.BarcodeType}");
    Console.WriteLine($"Page: {barcode.PageNumber}");
}

Imports IronBarCode

' Optimized options for scanning QR codes from a camera feed
Dim qrOptions As New BarcodeReaderOptions With {
    .ExpectMultipleBarcodes = True,
    .ExpectBarcodeTypes = BarcodeEncoding.QRCode Or BarcodeEncoding.PDF417,
    .Speed = ReadingSpeed.Detailed,
    .AutoRotate = True
}

' Decode barcodes from a saved image captured by the webcam
Dim imageResults = BarcodeReader.Read("barcode_snapshot.png", qrOptions)
For Each barcode In imageResults
    Console.WriteLine($"Data: {barcode.Value}")
    Console.WriteLine($"Type: {barcode.BarcodeType}")
    Console.WriteLine($"Page: {barcode.PageNumber}")
Next