.NET WinForm图像识别二维码/条形码并读取其中内容
需求:图像识别出一张图片中的二维码或者条形码,并读取其中内容。
一、安装库(特别注意,网上很多都没说清楚)
如果是基于.net framework,则安装ZXing.Net(建议0.14.0版本左右,具体看实际,版本太高,部分接口发生变化)
如果是基于.Net Standard 2.0 or .NET CORE 3.0/3.1 or .NET 5.0 or higher,则安装ZXing.Net.Bindings.Windows.Compatibility
二、WinForm示例代码(含关键优化)
using ZXing.Common;
using ZXing;
using ZXing.Windows.Compatibilitypublic partial class MainForm : Form
{public MainForm(){InitializeComponent();}// 选择图片按钮点击事件private void btnSelectImage_Click(object sender, EventArgs e){OpenFileDialog dialog = new OpenFileDialog();dialog.Filter = "图片文件|*.jpg;*.png;*.bmp";if (dialog.ShowDialog() == DialogResult.OK){pictureBox1.Image = Image.FromFile(dialog.FileName);}}// 识别条码按钮点击事件private void btnDecode_Click(object sender, EventArgs e){if (pictureBox1.Image == null){MessageBox.Show("请先选择图片");return;}var bitmap = new Bitmap(pictureBox1.Image);// 创建解码器(关键配置)var reader = new BarcodeReader{Options = new DecodingOptions{PossibleFormats = new[] { BarcodeFormat.QR_CODE, BarcodeFormat.CODE_128, // 条形码BarcodeFormat.EAN_13 },TryHarder = true, // 提高复杂图像识别率CharacterSet = "UTF-8" // 支持中文}};// 识别条码(支持多码)Result[] results = reader.DecodeMultiple(bitmap);if (results != null){foreach (Result result in results){txtResult.AppendText($"✅ 识别成功!类型:{result.BarcodeFormat},内容:{result.Text}\r\n");}}else{txtResult.Text = "❌ 识别失败:未检测到有效条码";}}
}
三、识别率优化技巧
//1. 图像预处理(解决模糊/低对比度问题)
csharp
// 转换为灰度图+二值化
var luminanceSource = new BitmapLuminanceSource(bitmap);
var binarizer = new HybridBinarizer(luminanceSource);
var binBitmap = new BinaryBitmap(binarizer);Result result = reader.Decode(binBitmap); // 使用处理后的图像
//2. 多尺度识别(针对小尺寸条码)
csharp
for (double scale = 1.0; scale <= 2.0; scale += 0.2)
{var scaledBitmap = new Bitmap(bitmap, new Size((int)(bitmap.Width * scale), (int)(bitmap.Height * scale)));Result result = reader.Decode(scaledBitmap);if (result != null) break;
}
//3. 区域裁剪(复杂背景中定位条码)
csharp
// 假设已知条码在图像右下角1/4区域
Rectangle cropArea = new Rectangle(bitmap.Width / 2, bitmap.Height / 2, bitmap.Width / 2, bitmap.Height / 2
);using (Bitmap cropped = bitmap.Clone(cropArea, bitmap.PixelFormat))
{Result result = reader.Decode(cropped);
}