Android平台OpenCV调用net.forward触发-215断言失败问题求助

I'm following the official OpenCV tutorial to build an Android application, but I keep hitting a -215 Assertion failed error when calling net.forward(). So far, I haven't been able to resolve it.

Background & Troubleshooting Done #

• Initially used OpenCV 3.4.3, which had Mat type compatibility issues. I've since upgraded to 3.4.7.
• Verified that the blob generated from the input frame has the correct dimensions.
• Tried multiple pairs of prototxt and caffemodel files—network loading succeeds every time, so file corruption isn't the issue.
• Confirmed the input frame is valid, the network instance isn't null, and network layers appear normal.

Key Code Snippets #

// Load a network.
public void onCameraViewStarted(int width, int height) {
    String proto = getPath("deploy.prototxt", this);
    String weights = getPath("MobileNetSSD_deploy.caffemodel", this);
    net = Dnn.readNetFromCaffe(proto, weights);
    Log.i(TAG, "Network loaded successfully");
}

public Mat onCameraFrame(CvCameraViewFrame inputFrame) {
    // Get a new frame
    Mat frame = inputFrame.rgba();
    Imgproc.cvtColor(frame, frame, Imgproc.COLOR_RGBA2RGB);
    // Forward image through network.
    Mat blob = Dnn.blobFromImage(frame, 0.007843, new Size(300, 300), new Scalar(127.5, 127.5, 127.5));
    net.setInput(blob);
    Mat detections = net.forward(); //***215 ASSERTION FAILED occurs***
    int cols = frame.cols();
    int rows = frame.rows();
    detections = detections.reshape(1, (int)detections.total() / 7);
    for (int i = 0; i < detections.rows(); ++i) {
        double confidence = detections.get(i, 2)[0];
        if (confidence > 0.2) {
            int classId = (int)detections.get(i, 1)[0];
            int left = (int)(detections.get(i, 3)[0] * cols);
            int top = (int)(detections.get(i, 4)[0] * rows);
            int right = (int)(detections.get(i, 5)[0] * cols);
            int bottom = (int)(detections.get(i, 6)[0] * rows);
            // Draw rectangle around detected object.
            Imgproc.rectangle(frame, new Point(left, top), new Point(right, bottom), new Scalar(0, 255, 0));
            String label = classNames[classId] + ": " + confidence;
            int[] baseLine = new int[1];
            Size labelSize = Imgproc.getTextSize(label, Core.FONT_HERSHEY_SIMPLEX, 0.5, 1, baseLine);
            // Draw background for label.
            Imgproc.rectangle(frame, new Point(left, top - labelSize.height), new Point(left + labelSize.width, top + baseLine[0]), new Scalar(255, 255, 255), Core.FILLED);
            // Write class name and confidence.
            Imgproc.putText(frame, label, new Point(left, top), Core.FONT_HERSHEY_SIMPLEX, 0.5, new Scalar(0, 0, 0));
        }
    }
    return frame;
}

public void onCameraViewStopped() {}

// Upload file to storage and return a path.
private static String getPath(String file, Context context) {
    AssetManager assetManager = context.getAssets();
    BufferedInputStream inputStream = null;
    try {
        // Read data from assets.
        inputStream = new BufferedInputStream(assetManager.open(file));
        byte[] data = new byte[inputStream.available()];
        inputStream.read(data);
        inputStream.close();
        // Create copy file in storage.
        File outFile = new File(context.getFilesDir(), file);
        FileOutputStream os = new FileOutputStream(outFile);
        os.write(data);
        os.close();
        // Return a path to file which may be read in common way.
        return outFile.getAbsolutePath();
    } catch (IOException ex) {
        Log.i(TAG, "Failed to upload a file");
    }
    return "";
}

Full Error Message #

cv::Exception: OpenCV(3.4.7) /build/3_4_pack-android/opencv/modules/dnn/src/layers/batch_norm_layer.cpp:39: error: (-215:Assertion failed) blobs.size() >= 2 in function 'cv::dnn::BatchNormLayerImpl::BatchNormLayerImpl(const cv::dnn::experimental_dnn_34_v13::LayerParams&)'

I need the app to run without crashing. Any suggestions or solutions would be greatly appreciated!

内容的提问来源于stack exchange，提问作者André