Javacv Blob检测 [英] Javacv Blob detection

问题描述

我想在我的应用程序中使用一些blob检测，这是用Java编写的，因此使用 JavaCV 而不是 OpenCV 。我找到了许多类，如：

I would like to use some blob detection in my application which is written in Java and thus using JavaCV instead of OpenCV. I found many classes like:

SimpleBlobDetector ， CvBlobDetector ， CvBlob ，...但我找不到任何教程或演示/示例代码在Java中使用它们。
任何人都可以告诉我如何使用它们，因为我无法弄清楚它们并没有好的文档。
谢谢！

SimpleBlobDetector, CvBlobDetector, CvBlob, ... but I can't find any tutorial or demo/example code to use these in Java. Could anyone please tell me how to use these as I can't figure it out and there's no good documentation for them. Thanks!

推荐答案

我正是在这个时刻处理同样的问题并有第一个解决方案。
那里有很多方法，但不幸的是大多数方法都是丑陋而缓慢的。
我现在的主要目标是留在JavaCV / OpenCV-World。

I am just in this moment working on the same problem and have a first solution. There's a lot of approaches out there but unfortunately most of them are ugly and slow. My main goal to this point was to stay in the JavaCV/OpenCV-World.

这些链接让我朝着正确的方向前进：

These Links pushed me in the right direction:

1. OpenCV中的Blob提取


2. http://voices.yahoo.com/connected-components-using-opencv-5462975.html?cat=15


3. http://opencv.willowgarage.com/documentation/cpp/structural_analysis_and_shape_descriptors.html#cv-findcontours

1. Blob extraction in OpenCV
2. http://voices.yahoo.com/connected-components-using-opencv-5462975.html?cat=15
3. http://opencv.willowgarage.com/documentation/cpp/structural_analysis_and_shape_descriptors.html#cv-findcontours

这是一个完整的演示类，可以告诉你它是如何完成的。
尝试使用带有简单物体和尖角的黑色背景图像，以获得最佳效果。请务必查看上面的第二个链接，以了解代码中发生的情况。

Here's a complete Demo class that should show you how it's done. Try it with a black background image with simple objects and sharp corners for best results. Make sure to check the second link above to get informed about what's happening in the code.

import static com.googlecode.javacpp.Loader.sizeof;
import static com.googlecode.javacv.cpp.opencv_core.CV_FILLED;
import static com.googlecode.javacv.cpp.opencv_core.CV_RGB;
import static com.googlecode.javacv.cpp.opencv_core.IPL_DEPTH_8U;
import static com.googlecode.javacv.cpp.opencv_core.cvCreateImage;
import static com.googlecode.javacv.cpp.opencv_core.cvCreateMemStorage;
import static com.googlecode.javacv.cpp.opencv_core.cvDrawContours;
import static com.googlecode.javacv.cpp.opencv_core.cvGetSize;
import static com.googlecode.javacv.cpp.opencv_core.cvPoint;
import static com.googlecode.javacv.cpp.opencv_highgui.cvLoadImage;
import static com.googlecode.javacv.cpp.opencv_highgui.cvSaveImage;
import static com.googlecode.javacv.cpp.opencv_imgproc.CV_BGR2GRAY;
import static com.googlecode.javacv.cpp.opencv_imgproc.CV_CHAIN_APPROX_SIMPLE;
import static com.googlecode.javacv.cpp.opencv_imgproc.CV_RETR_CCOMP;
import static com.googlecode.javacv.cpp.opencv_imgproc.CV_THRESH_BINARY;
import static com.googlecode.javacv.cpp.opencv_imgproc.cvCvtColor;
import static com.googlecode.javacv.cpp.opencv_imgproc.cvFindContours;
import static com.googlecode.javacv.cpp.opencv_imgproc.cvThreshold;

import java.awt.Color;
import java.util.Random;

import com.googlecode.javacv.cpp.opencv_core.CvContour;
import com.googlecode.javacv.cpp.opencv_core.CvMemStorage;
import com.googlecode.javacv.cpp.opencv_core.CvScalar;
import com.googlecode.javacv.cpp.opencv_core.CvSeq;
import com.googlecode.javacv.cpp.opencv_core.IplImage;

/**
 * A demo for blob extraction using only JavaCV / OpenCV
 * @see https://stackoverflow.com/questions/4641817/blob-extraction-in-opencv
 * @see http://voices.yahoo.com/connected-components-using-opencv-5462975.html?cat=15
 * @see http://opencv.willowgarage.com/documentation/cpp/structural_analysis_and_shape_descriptors.html#cv-findcontours
 * @author happyburnout
 */

public class JavaCVBlobDemo {

    static String sourcePath = "c:/test/source.jpg";
    static String targetPath = "c:/test/target.jpg";

    public static void main (String args[]){
        IplImage image = cvLoadImage(sourcePath);
        IplImage grayImage = cvCreateImage(cvGetSize(image), IPL_DEPTH_8U, 1);
        cvCvtColor(image, grayImage, CV_BGR2GRAY);

        CvMemStorage mem;
        CvSeq contours = new CvSeq();
        CvSeq ptr = new CvSeq();
        cvThreshold(grayImage, grayImage, 150, 255, CV_THRESH_BINARY);
        mem = cvCreateMemStorage(0);

        cvFindContours(grayImage, mem, contours, sizeof(CvContour.class) , CV_RETR_CCOMP, CV_CHAIN_APPROX_SIMPLE, cvPoint(0,0));

        Random rand = new Random();
        for (ptr = contours; ptr != null; ptr = ptr.h_next()) {
            Color randomColor = new Color(rand.nextFloat(), rand.nextFloat(), rand.nextFloat());
            CvScalar color = CV_RGB( randomColor.getRed(), randomColor.getGreen(), randomColor.getBlue());
            cvDrawContours(image, ptr, color, CV_RGB(0,0,0), -1, CV_FILLED, 8, cvPoint(0,0));
        }
        cvSaveImage(targetPath, image);
    }

}

这篇关于Javacv Blob检测的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！