Java OpenCV 图像处理27.4 FAST 角点检测

Java OpenCV 图像处理27.4 FAST 角点检测

package com.xu.opencv;import java.io.File;import org.opencv.core.Mat;
import org.opencv.core.MatOfKeyPoint;
import org.opencv.core.Scalar;
import org.opencv.features2d.FastFeatureDetector;
import org.opencv.features2d.Features2d;
import org.opencv.highgui.HighGui;
import org.opencv.imgcodecs.Imgcodecs;/*** @Title: Test.java* @Description: OpenCV* @Package com.xu.opencv* @author: hyacinth* @date: 2022年2月18日12点20分* @version: V-1.0.0* @Copyright: 2022 hyacinth*/
public class Test {static {String os = System.getProperty("os.name");String type = System.getProperty("sun.arch.data.model");if (os.toUpperCase().contains("WINDOWS")) {File lib;if (type.endsWith("64")) {lib = new File("D:\\Learn\\OpenCV\\OpenCV-4.5.5\\build\\java\\x64\\" + System.mapLibraryName("opencv_java455"));} else {lib = new File("D:\\Learn\\OpenCV\\OpenCV-4.5.5\\build\\java\\x86\\" + System.mapLibraryName("opencv_java455"));}System.load(lib.getAbsolutePath());}}public static void main(String[] args) {Mat src = Imgcodecs.imread("D:\\OneDrive\\桌面\\5.jpeg");FastFeatureDetector fd = FastFeatureDetector.create(FastFeatureDetector.THRESHOLD);MatOfKeyPoint regions = new MatOfKeyPoint();fd.detect(src, regions);Features2d.drawKeypoints(src, regions, src, new Scalar(0, 0, 255), Features2d.DrawMatchesFlags_DRAW_RICH_KEYPOINTS);HighGui.imshow("", src);HighGui.waitKey(0);}}

package com.xu.image;import java.io.File;import org.opencv.core.Mat;
import org.opencv.core.MatOfKeyPoint;
import org.opencv.core.MatOfPoint;
import org.opencv.core.Point;
import org.opencv.core.Scalar;
import org.opencv.features2d.FastFeatureDetector;
import org.opencv.features2d.Features2d;
import org.opencv.features2d.ORB;
import org.opencv.features2d.SIFT;
import org.opencv.highgui.HighGui;
import org.opencv.imgcodecs.Imgcodecs;
import org.opencv.imgproc.Imgproc;/*** @Title: CornerPoint.java* @Description: OpenCV-4.0.0 测试文件* @Package com.xu.Image* @author: hyacinth* @date: 2022年2月18日12点20分* @version: V-1.0.0* @Copyright: 2022 hyacinth*/
public class CornerPoint {static {String os = System.getProperty("os.name");String type = System.getProperty("sun.arch.data.model");if (os.toUpperCase().contains("WINDOWS")) {File lib;if (type.endsWith("64")) {lib = new File("D:\\Learn\\OpenCV\\OpenCV-4.5.5\\build\\java\\x64\\" + System.mapLibraryName("opencv_java455"));} else {lib = new File("D:\\Learn\\OpenCV\\OpenCV-4.5.5\\build\\java\\x86\\" + System.mapLibraryName("opencv_java455"));}System.load(lib.getAbsolutePath());}}public static void main(String[] args) {Mat src = Imgcodecs.imread("D:\\OneDrive\\桌面\\5.jpeg");HighGui.imshow("原图", src);shi_tomasi();}/*** OpenCV-4.1.0 FAST 角点检测** @return void* @Author: hyacinth* @Title: fast* @Description: TODO* @date: 2022年2月22日12点32分*/public static void fast() {Mat src = Imgcodecs.imread("D:\\OneDrive\\桌面\\5.jpeg");FastFeatureDetector fd = FastFeatureDetector.create(FastFeatureDetector.THRESHOLD);MatOfKeyPoint regions = new MatOfKeyPoint();fd.detect(src, regions);Features2d.drawKeypoints(src, regions, src, new Scalar(0, 0, 255), Features2d.DrawMatchesFlags_DRAW_RICH_KEYPOINTS);HighGui.imshow("FAST 角点检测", src);HighGui.waitKey(0);}/*** OpenCV-4.1.0 ORB 角点检测** @return void* @Author: hyacinth* @Title: orb* @Description: TODO* @date: 2022年2月22日12点32分*/public static void orb() {Mat src = Imgcodecs.imread("D:\\OneDrive\\桌面\\5.jpeg");Mat gray = new Mat();Imgproc.cvtColor(src, gray, Imgproc.COLOR_BGR2GRAY);ORB orb = ORB.create(800, 1.2f, 8, 31, 0, 2, ORB.HARRIS_SCORE, 3, 3);MatOfKeyPoint point = new MatOfKeyPoint();orb.detect(gray, point);Features2d.drawKeypoints(src, point, src, new Scalar(0, 0, 255), Features2d.DrawMatchesFlags_DRAW_RICH_KEYPOINTS);HighGui.imshow("ORB 角点检测", src);HighGui.waitKey(0);}/*** OpenCV-4.1.0 SIFT 角点检测** @return void* @Author: hyacinth* @Title: sift* @Description: TODO* @date: 2022年2月22日12点32分*/public static void sift() {Mat src = Imgcodecs.imread("D:\\OneDrive\\桌面\\5.jpeg");Mat gray = new Mat();Imgproc.cvtColor(src, gray, Imgproc.COLOR_BGR2GRAY);SIFT sift = SIFT.create(8000);MatOfKeyPoint point = new MatOfKeyPoint();sift.detect(gray, point);Features2d.drawKeypoints(src, point, src, new Scalar(0, 0, 255), Features2d.DrawMatchesFlags_DRAW_RICH_KEYPOINTS);HighGui.imshow("SIFT 角点检测", src);HighGui.waitKey(0);}/*** OpenCV-4.1.0 Harris 角点检测** @return void* @Author: hyacinth* @Title: harris* @Description: TODO* @date: 2019年8月26日 下午10:13:10*/public static void harris() {Mat src = Imgcodecs.imread("D:\\OneDrive\\桌面\\5.jpeg");Mat gray = new Mat();Imgproc.cvtColor(src, gray, Imgproc.COLOR_BGR2GRAY);Mat dst = new Mat();Imgproc.cornerHarris(gray, dst, 3, 15, 0.04);for (int i = 0, row = dst.rows(); i < row; i++) {for (int j = 0, col = dst.cols(); j < col; j++) {if (dst.get(i, j)[0] > 130) {Imgproc.circle(src, new Point(i - 3, j + 2), 1, new Scalar(0, 0, 255), 1, Imgproc.LINE_AA);}}}HighGui.imshow("Harris 角点检测", src);HighGui.waitKey(0);}/*** OpenCV-4.1.0 Shi-Tomasi 角点检测** @return void* @Author: hyacinth* @Title: shi_tomasi* @Description: TODO* @date: 2019年8月26日 下午10:11:02*/public static void shi_tomasi() {Mat src = Imgcodecs.imread("D:\\OneDrive\\桌面\\5.jpeg");Mat gray = new Mat();Imgproc.cvtColor(src, gray, Imgproc.COLOR_BGR2GRAY);MatOfPoint corners = new MatOfPoint();Imgproc.goodFeaturesToTrack(gray, corners, 200, 0.01, 10, new Mat(), 3, 5, false, 0.04);int[] cornersData = new int[(int) (corners.total() * corners.channels())];corners.get(0, 0, cornersData);for (int i = 0; i < corners.rows(); i++) {Imgproc.circle(src, new Point(cornersData[i * 2], cornersData[i * 2 + 1]), 3, new Scalar(0, 0, 255), Imgproc.FILLED);}HighGui.imshow("Shi-Tomasi 角点检测", src);HighGui.waitKey(0);}}

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