有没有办法使用Google ML Kit同时扫描多个二维码？

Question

我正在开发一个 Android 应用程序，需要一次扫描多个 QR 码（例如，单帧中最多同时检测和解码 10 个 QR 码）。我正在考虑使用 Google ML Kit 的条形码扫描 API，但我不确定它是否支持在单个相机帧中检测和解码多个二维码。

这就是我想要实现的目标：

- Detect and decode up to 10 QR codes simultaneously.
- Process the results efficiently for real-time feedback.

我尝试过的：

- I’ve reviewed the ML Kit Barcode Scanning API documentation, but it’s not clear whether this functionality is supported out of the box.
- I tested the API with single QR codes, and it works perfectly for one barcode or QR code at a time.
- I attempted scanning multiple QR codes by feeding a frame containing multiple codes, but it seems to detect only one at a time.

我的问题：

- Does Google ML Kit Barcode Scanning API natively support multiple QR code detection?
- If not, is there any open-source implementation or workaround to achieve this functionality using ML Kit or another library (e.g., Zxing or ZBar)?
- Are there specific configurations or techniques to enhance the detection of multiple barcodes/QR codes in one frame?

其他详细信息：

- Development environment: Android (Java/Kotlin)
- Library version: Google ML Kit Barcode Scanning (latest version as of writing)
- Use case: Real-time scanning of bulk QR codes (up to 10) in a single camera frame.

如果 ML Kit 不是此用例的正确选择，我将不胜感激任何有助于实现这一目标的其他库或方法的建议。

谢谢！

Answer 1

是的，Google ML Kit 的条形码扫描 API 支持在单个框架中扫描多个二维码。

要检测多个 QR 码，请将扫描仪配置为定位 QR 码：

    val options = BarcodeScannerOptions.Builder()
        .setBarcodeFormats(Barcode.FORMAT_QR_CODE)
        .build()

创建扫描仪实例：

    val scanner = BarcodeScanning.getClient(options)

处理图像帧：

    val image = InputImage.fromBitmap(bitmap, 0)
    
    scanner.process(image)
        .addOnSuccessListener { barcodes ->
            for (barcode in barcodes) {
                val rawValue = barcode.rawValue
                // Use or display the detected QR code data
            }
        }
        .addOnFailureListener { e ->
            Log.e("QRScanner", "Error: ", e)
        }

此方法在单帧中最多检测 10 个 QR 码。如果您需要扫描十多个代码，想要即用型扫描 UI 组件，您可以考虑使用商业替代品，例如 Scanbot SDK。该 SDK 支持无条形码限制的扫描，并提供预构建的 UI 元素以加快实施速度（为了提高透明度，我在 Scanbot 工作）。