在Android Java中使用OpenCV获取带有统计信息的connectedComponents,以及如何使用这些统计信息来获取左上角点、右下角点、质心和面积等,可以按照以下步骤进行:
import org.opencv.android.OpenCVLoader;
// 在Activity的onCreate方法中调用
if (!OpenCVLoader.initDebug()) {
OpenCVLoader.initAsync(OpenCVLoader.OPENCV_VERSION_3_4_0, this, mLoaderCallback);
}
// 在Activity中添加LoaderCallback回调
private BaseLoaderCallback mLoaderCallback = new BaseLoaderCallback(this) {
@Override
public void onManagerConnected(int status) {
switch (status) {
case LoaderCallbackInterface.SUCCESS:
// OpenCV加载成功,可以进行相关操作
break;
default:
super.onManagerConnected(status);
break;
}
}
};
import org.opencv.core.Core;
import org.opencv.core.CvType;
import import org.opencv.core.Mat;
import org.opencv.core.MatOfInt4;
import org.opencv.core.MatOfPoint;
import org.opencv.core.Point;
import org.opencv.core.Scalar;
import org.opencv.core.Size;
import org.opencv.imgproc.Imgproc;
// 加载图像
Mat image = Imgcodecs.imread("path_to_image", Imgcodecs.IMREAD_GRAYSCALE);
// 对图像进行预处理
Mat binaryImage = new Mat();
Imgproc.threshold(image, binaryImage, 0, 255, Imgproc.THRESH_BINARY_INV | Imgproc.THRESH_OTSU);
Mat labels = new Mat();
Mat stats = new Mat();
Mat centroids = new Mat();
int connectivity = 8;
int labelNum = Imgproc.connectedComponentsWithStats(binaryImage, labels, stats, centroids, connectivity, CvType.CV_32S);
for (int i = 1; i < labelNum; i++) {
int left = (int) stats.get(i, Imgproc.CC_STAT_LEFT)[0];
int top = (int) stats.get(i, Imgproc.CC_STAT_TOP)[0];
int width = (int) stats.get(i, Imgproc.CC_STAT_WIDTH)[0];
int height = (int) stats.get(i, Imgproc.CC_STAT_HEIGHT)[0];
int area = (int) stats.get(i, Imgproc.CC_STAT_AREA)[0];
// 计算右下角点和质心
int right = left + width;
int bottom = top + height;
Point centroid = new Point(centroids.get(i, 0)[0], centroids.get(i, 1)[0]);
// 打印结果
System.out.println("Component " + i + ":");
System.out.println("Left: " + left);
System.out.println("Top: " + top);
System.out.println("Right: " + right);
System.out.println("Bottom: " + bottom);
System.out.println("Centroid: " + centroid);
System.out.println("Area: " + area);
}
这样,你就可以使用OpenCV在Android Java中获取带有统计信息的connectedComponents,并使用这些统计信息来获取左上角点、右下角点、质心和面积等属性。
关于OpenCV的更多详细信息和使用方法,你可以参考腾讯云的OpenCV产品文档:OpenCV产品介绍。
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