带有 Android 的 openCV 表面：已连接

Question

我正在尝试将我的 Android 应用程序与 OpenCV 库连接起来，我需要使用本机摄像头来更好地控制摄像头选项。为此，我找到了http://nezarobot.blogspot.it/2016/03/android-surfacetexture-camera2-opencv.html，这就是我所需要的。 我的问题是，如果我使用此代码，进行一些小的更改，当我启动它时，我的应用程序崩溃并报告了 3 个错误：

• E/BufferQueueProducer：[SurfaceTexture-0-31525-0] connect(P)：已连接 (cur=4 req=2)
• D/PlateNumberDetection/DetectionBasedTracker：ANativeWindow_lock 失败，错误代码为 -22
• A/libc：致命信号 11 (SIGSEGV)，代码 1，tid 31735 (CameraBackgroun) 中的故障地址 0x315e9858

我曾尝试在 jni 调用之前关闭摄像头，我只能捕获并显示第一帧，但是我需要重新启动摄像头，我无法自行创建相同的线程。

我在这里取帧并发送到 NDK。

private final ImageReader.OnImageAvailableListener mOnImageAvailableListener
        = new ImageReader.OnImageAvailableListener() {

    @Override
    public void onImageAvailable(ImageReader reader) {

        Image image;

        try {
            image = reader.acquireLatestImage();
            if( image == null) {
                return;
            }



            if (image.getFormat() != ImageFormat.YUV_420_888) {
                throw new IllegalArgumentException("image must have format YUV_420_888.");
            }

            Image.Plane[] planes = image.getPlanes();

            if (planes[1].getPixelStride() != 1 && planes[1].getPixelStride() != 2) {
                throw new IllegalArgumentException(
                        "src chroma plane must have a pixel stride of 1 or 2: got "
                                + planes[1].getPixelStride());
            }

            mNativeDetector.detect(image.getWidth(), image.getHeight(), planes[0].getBuffer(), surface);


        } catch (IllegalStateException e) {
            Log.e(TAG, "Too many images queued for saving, dropping image for request: ", e);
            return;
        }
        image.close();
    }
};

我在这里管理相机预览

protected void createCameraPreview() {
    try {
        SurfaceTexture texture = textureView.getSurfaceTexture();
        assert texture != null;
        texture.setDefaultBufferSize(imageDimension.getWidth(), imageDimension.getHeight());
        surface = new Surface(texture);
        captureRequestBuilder = cameraDevice.createCaptureRequest(CameraDevice.TEMPLATE_PREVIEW);
        captureRequestBuilder.addTarget(mImageReader.get().getSurface());

        BlockingSessionCallback sessionCallback = new BlockingSessionCallback();

        List<Surface> outputSurfaces = new ArrayList<>();
        outputSurfaces.add(mImageReader.get().getSurface());
        outputSurfaces.add(new Surface(textureView.getSurfaceTexture()));

        cameraDevice.createCaptureSession(outputSurfaces, sessionCallback, mBackgroundHandler);

        try {
            Log.d(TAG, "waiting on session.");
            cameraCaptureSessions = sessionCallback.waitAndGetSession(SESSION_WAIT_TIMEOUT_MS);
            try {
                captureRequestBuilder.set(CaptureRequest.CONTROL_MODE, CaptureRequest.CONTROL_MODE_AUTO);


                Log.d(TAG, "setting repeating request");

                cameraCaptureSessions.setRepeatingRequest(captureRequestBuilder.build(),
                        mCaptureCallback, mBackgrounHandler);
            } catch (CameraAccessException e) {
                e.printStackTrace();
            }
        } catch (TimeoutRuntimeException e) {
            Toast.makeText(AydaMainActivity.this, "Failed to configure capture session.", Toast.LENGTH_SHORT);
        }

    } catch (CameraAccessException e) {
        e.printStackTrace();
    }
}

Answer 1

您是否先尝试过没有“一些小改动”的代码？我已经尝试过该项目，它在多种设备上运行良好。因此，首先确定它是否根本无法在您的手机上运行，​​或者您的修改是否存在问题，这将很有用。