在Android中使用OpenCV绘制轮廓线,可以通过以下步骤实现:
import org.opencv.android.OpenCVLoader;
public class ContourUtils {
static {
if (!OpenCVLoader.initDebug()) {
// OpenCV initialization failed
}
}
}
import org.opencv.core.Mat;
import org.opencv.core.MatOfPoint;
import org.opencv.core.Scalar;
import org.opencv.imgproc.Imgproc;
public class ContourUtils {
// ...
public static Mat drawContours(Mat image) {
Mat grayImage = new Mat();
Mat cannyImage = new Mat();
Mat hierarchy = new Mat();
Mat contourImage = Mat.zeros(image.size(), image.type());
// Convert image to grayscale
Imgproc.cvtColor(image, grayImage, Imgproc.COLOR_BGR2GRAY);
// Apply Canny edge detection
Imgproc.Canny(grayImage, cannyImage, 50, 150);
// Find contours
List<MatOfPoint> contours = new ArrayList<>();
Imgproc.findContours(cannyImage, contours, hierarchy, Imgproc.RETR_EXTERNAL, Imgproc.CHAIN_APPROX_SIMPLE);
// Draw contours on contourImage
Imgproc.drawContours(contourImage, contours, -1, new Scalar(0, 255, 0), 2);
return contourImage;
}
}
import org.opencv.android.Utils;
import org.opencv.core.Mat;
import org.opencv.core.CvType;
import org.opencv.android.CameraBridgeViewBase;
import org.opencv.android.CameraBridgeViewBase.CvCameraViewListener2;
public class MainActivity extends AppCompatActivity implements CvCameraViewListener2 {
private CameraBridgeViewBase mOpenCvCameraView;
// ...
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
// ...
mOpenCvCameraView = (CameraBridgeViewBase) findViewById(R.id.camera_view);
mOpenCvCameraView.setVisibility(SurfaceView.VISIBLE);
mOpenCvCameraView.setCvCameraViewListener(this);
}
// ...
@Override
public Mat onCameraFrame(CameraBridgeViewBase.CvCameraViewFrame inputFrame) {
Mat rgbaImage = inputFrame.rgba();
Mat contourImage = ContourUtils.drawContours(rgbaImage);
// Convert contourImage to Bitmap for display
Bitmap contourBitmap = Bitmap.createBitmap(contourImage.cols(), contourImage.rows(), Bitmap.Config.ARGB_8888);
Utils.matToBitmap(contourImage, contourBitmap);
// Display contourBitmap in an ImageView or other view
return rgbaImage;
}
}
这样,你就可以在Android中使用OpenCV绘制轮廓线了。请注意,以上代码仅为示例,实际使用时可能需要根据你的具体需求进行适当修改和调整。
对于OpenCV的更多详细信息和使用方法,你可以参考腾讯云的OpenCV产品介绍页面:OpenCV产品介绍。
领取专属 10元无门槛券
手把手带您无忧上云