使用openCV在android中绘制关键点

我想在OnCameraFrame中画关键点，但我出错了，有人能帮我吗？我把代码放在下面：

代码：

我的日志是：

11-26 16:22:49.305: D/JavaCameraView(22620): Starting processing thread
11-26 16:22:51.615: I/Choreographer(22620): Skipped 182 frames!  The application may be doing      too much work on its main thread.
11-26 16:22:51.735: D/JavaCameraView(22620): Preview Frame received. Frame size: 1382400
11-26 16:22:51.735: I/ActivityManager(22620): Timeline: Activity_idle id: android.os.BinderProxy@428db6c0 time:135999496
11-26 16:22:51.755: W/dalvikvm(22620): threadid=13: thread exiting with uncaught exception (group=0x41875e48)

11-26 16:22:51.755:E/AndroidRuntime（22620）：致命异常：Thread-35591 11-26 16:22:51.755:E/AndroidRuntime（22620）：进程：com.nummist.secondsight，PID:22620 11-26 16:22:51.755:E/AndroidRuntime（22620）：java.lang.ClassCastException:org.opencv.android.JavaCameraView$JavaCameraFrame无法转换为org.opencv.core.Mat 11-26 16:22:51.755:E/AndroidRuntime（22620）：位于com.nummit.secondsight.CameraActivity.onCameraFrame（CameraActivity.java:373） 11-26 16:22:51.755:E/AndroidRuntime（22620）：位于org.opencv.android.camerabigeViewbase.deliverAndDrawFrame（camerabigeViewbase.java:387） 11-26 16:22:51.755:E/AndroidRuntime（22620）：在org.opencv.android.JavaCameraView$CameraWorker.run（JavaCameraView.java:328） 11-26 16:22:51.755:E/AndroidRuntime（22620）：在java.lang.Thread.run（Thread.java:841） 11-26 16:22:51.775:D/JavaCameraView（22620）：接收到预览帧。框架尺寸：1382400 11-26 16:22:51.795:D/JavaCameraView（22620）：断开与摄像头的连接 11-26 16:22:51.795:D/JavaCameraView（22620）：通知线程 11-26 16:22:51.795:D/JavaCameraView（22620）：等待线程

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粗体显示红色LogCat消息

我不确定，但我认为您必须使用：

MatOfKeyPoint points = new MatOfKeyPoint();
Mat mat = inputFrame.rgba();
FeatureDetector fast = FeatureDetector.create(FeatureDetector.FAST);
fast.detect(mat, points);


Scalar redcolor = new Scalar(255,0,0);
Mat mRgba= mat.clone();
Imgproc.cvtColor(mat, mRgba, Imgproc.COLOR_RGBA2RGB,4);
Core.line(mRgba, new Point(100, 100), new Point(300,300), new Scalar(0, 0, 255));

Features2d.drawKeypoints(mRgba, points, mRgba, redcolor, 3);


return mRgba;

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区别是什么？Mat Mat=inputFrame.rgba（）；

MatOfKeyPoint points = new MatOfKeyPoint();
Mat mat = inputFrame.rgba();
FeatureDetector fast = FeatureDetector.create(FeatureDetector.FAST);
fast.detect(mat, points);


Scalar redcolor = new Scalar(255,0,0);
Mat mRgba= mat.clone();
Imgproc.cvtColor(mat, mRgba, Imgproc.COLOR_RGBA2RGB,4);
Core.line(mRgba, new Point(100, 100), new Point(300,300), new Scalar(0, 0, 255));

Features2d.drawKeypoints(mRgba, points, mRgba, redcolor, 3);


return mRgba;