我正在尝试开发一个 WindowsForm 应用程序,它将使用网络摄像头检测 QRCode 并解码消息。为此,我使用 AForge.NET 和 ZXing.NET。
到目前为止,我已经能够弄清楚如何从 URI 中解码 QRCode,但我想检测来自网络摄像头的 QRCode,然后对其进行解码。
下面是我的代码示例。
public String Decode(Uri uri)
{
Bitmap image;
try
{
image = (Bitmap)Bitmap.FromFile(uri.LocalPath);
}
catch (Exception ex)
{
throw new FileNotFoundException("Resource not found: " + uri);
}
using (image)
{
String text = "";
LuminanceSource source = new BitmapLuminanceSource(image);
BinaryBitmap bitmap = new BinaryBitmap(new HybridBinarizer(source));
Result result = new MultiFormatReader().decode(bitmap);
if (result != null)
{
text = result.Text;
return text;
}
text = "Provided QR couldn't be read.";
return text;
}
}
最佳答案
private FilterInfoCollection videoDevices;
private VideoCaptureDevice videoSource;
private Bitmap capturedImage;
private String message = "";
public FormQRCodeScanner()
{
InitializeComponent();
}
private void FormQRCodeScanner_Load(object sender, EventArgs e)
{
videoDevices = new FilterInfoCollection(FilterCategory.VideoInputDevice);
foreach (FilterInfo device in videoDevices)
{
comboBoxCameraSource.Items.Add(device.Name);
}
comboBoxCameraSource.SelectedIndex = 0;
videoSource = new VideoCaptureDevice();
buttonStartStop.Text = "Start";
buttonCapture.Enabled = false;
buttonDecode.Enabled = false;
}
private void FormQRCodeScanner_FormClosing(object sender, FormClosingEventArgs e)
{
if (videoSource.IsRunning)
{
videoSource.Stop();
}
}
void videoSource_NewFrame(object sender, NewFrameEventArgs eventArgs)
{
Bitmap image = (Bitmap) eventArgs.Frame.Clone();
pictureBoxSource.Image = image;
}
private void buttonStartStop_Click(object sender, EventArgs e)
{
if (videoSource.IsRunning)
{
videoSource.Stop();
pictureBoxSource.Image = null;
pictureBoxCaptured.Image = null;
pictureBoxSource.Invalidate();
pictureBoxCaptured.Invalidate();
buttonStartStop.Text = "Start";
buttonCapture.Enabled = false;
buttonDecode.Enabled = false;
}
else
{
videoSource = new VideoCaptureDevice(videoDevices[comboBoxCameraSource.SelectedIndex].MonikerString);
videoSource.NewFrame += new NewFrameEventHandler(videoSource_NewFrame);
videoSource.Start();
buttonStartStop.Text = "Stop";
buttonCapture.Enabled = true;
buttonDecode.Enabled = true;
}
}
private void buttonCapture_Click(object sender, EventArgs e)
{
if (videoSource.IsRunning)
{
pictureBoxCaptured.Image = (Bitmap)pictureBoxSource.Image.Clone();
capturedImage = (Bitmap)pictureBoxCaptured.Image;
}
}
private void buttonDecode_Click(object sender, EventArgs e)
{
if (capturedImage != null)
{
ExtractQRCodeMessageFromImage(capturedImage);
richTextBoxMessage.Text = message;
richTextBoxMessage.ReadOnly = true;
}
}
private string ExtractQRCodeMessageFromImage(Bitmap bitmap)
{
try
{
BarcodeReader reader = new BarcodeReader
(null, newbitmap => new BitmapLuminanceSource(bitmap), luminance => new GlobalHistogramBinarizer(luminance));
reader.AutoRotate = true;
reader.TryInverted = true;
reader.Options = new DecodingOptions { TryHarder = true };
var result = reader.Decode(bitmap);
if (result != null)
{
message = result.Text;
return message;
}
else
{
message = "QRCode couldn't be decoded.";
return message;
}
}
catch (Exception ex)
{
message = "QRCode couldn't be detected.";
return message;
}
}
关于c# - 如何在 C# 中使用 Aforge.NET 和 ZXing.NET 从 WebCamera 解码 QRCode,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/32634027/