Question

opencv连续画点时怎么保证前面的点不动

Answer 1

　　整个项目的结构图：
　　编写DetectFaceDemo.java,代码如下：

　　[java] view
　　plaincopyprint?

　　package com.njupt.zhb.test;

　　import org.opencv.core.Core;

　　import org.opencv.core.Mat;

　　import org.opencv.core.MatOfRect;

　　import org.opencv.core.Point;

　　import org.opencv.core.Rect;

　　import org.opencv.core.Scalar;

　　import org.opencv.highgui.Highgui;

　　import org.opencv.objdetect.CascadeClassifier;

　　//

　　// Detects faces in an image, draws boxes around them, and writes the results

　　// to "faceDetection.png".

　　//

　　public class DetectFaceDemo {

　　public void run() {

　　System.out.println("\nRunning DetectFaceDemo");

　　System.out.println(getClass().getResource("lbpcascade_frontalface.xml").getPath());

　　// Create a face detector from the cascade file in the resources

　　// directory.

　　//CascadeClassifier faceDetector = new CascadeClassifier(getClass().getResource("lbpcascade_frontalface.xml").getPath());

　　//Mat image = Highgui.imread(getClass().getResource("lena.png").getPath());

　　//注意：源程序的路径会多打印一个‘/’，因此总是出现如下错误

　　/*

　　* Detected 0 faces Writing faceDetection.png libpng warning: Image

　　* width is zero in IHDR libpng warning: Image height is zero in IHDR

　　* libpng error: Invalid IHDR data

　　*/

　　//因此，我们将第一个字符去掉

　　String xmlfilePath=getClass().getResource("lbpcascade_frontalface.xml").getPath().substring(1);

　　CascadeClassifier faceDetector = new CascadeClassifier(xmlfilePath);

　　Mat image = Highgui.imread(getClass().getResource("we.jpg").getPath().substring(1));

　　// Detect faces in the image.

　　// MatOfRect is a special container class for Rect.

　　MatOfRect faceDetections = new MatOfRect();

　　faceDetector.detectMultiScale(image, faceDetections);

　　System.out.println(String.format("Detected %s faces", faceDetections.toArray().length));

　　// Draw a bounding box around each face.

　　for (Rect rect : faceDetections.toArray()) {

　　Core.rectangle(image, new Point(rect.x, rect.y), new Point(rect.x + rect.width, rect.y + rect.height), new Scalar(0, 255, 0));

　　}

　　// Save the visualized detection.

　　String filename = "faceDetection.png";

　　System.out.println(String.format("Writing %s", filename));

　　Highgui.imwrite(filename, image);

　　}

　　}
　　package com.njupt.zhb.test;
　　import org.opencv.core.Core;
　　import org.opencv.core.Mat;
　　import org.opencv.core.MatOfRect;
　　import org.opencv.core.Point;
　　import org.opencv.core.Rect;
　　import org.opencv.core.Scalar;
　　import org.opencv.highgui.Highgui;
　　import org.opencv.objdetect.CascadeClassifier;

　　//
　　// Detects faces in an image, draws boxes around them, and writes the results
　　// to "faceDetection.png".
　　//
　　public class DetectFaceDemo {
　　public void run() {
　　System.out.println("\nRunning DetectFaceDemo");
　　System.out.println(getClass().getResource("lbpcascade_frontalface.xml").getPath());
　　// Create a face detector from the cascade file in the resources
　　// directory.
　　//CascadeClassifier faceDetector = new CascadeClassifier(getClass().getResource("lbpcascade_frontalface.xml").getPath());
　　//Mat image = Highgui.imread(getClass().getResource("lena.png").getPath());
　　//注意：源程序的路径会多打印一个‘/’，因此总是出现如下错误
　　/*
　　* Detected 0 faces Writing faceDetection.png libpng warning: Image
　　* width is zero in IHDR libpng warning: Image height is zero in IHDR
　　* libpng error: Invalid IHDR data
　　*/
　　//因此，我们将第一个字符去掉
　　String xmlfilePath=getClass().getResource("lbpcascade_frontalface.xml").getPath().substring(1);
　　CascadeClassifier faceDetector = new CascadeClassifier(xmlfilePath);
　　Mat image = Highgui.imread(getClass().getResource("we.jpg").getPath().substring(1));
　　// Detect faces in the image.
　　// MatOfRect is a special container class for Rect.
　　MatOfRect faceDetections = new MatOfRect();
　　faceDetector.detectMultiScale(image, faceDetections);

　　System.out.println(String.format("Detected %s faces", faceDetections.toArray().length));

　　// Draw a bounding box around each face.
　　for (Rect rect : faceDetections.toArray()) {
　　Core.rectangle(image, new Point(rect.x, rect.y), new Point(rect.x + rect.width, rect.y + rect.height), new Scalar(0, 255, 0));
　　}

　　// Save the visualized detection.
　　String filename = "faceDetection.png";
　　System.out.println(String.format("Writing %s", filename));
　　Highgui.imwrite(filename, image);
　　}
　　}

　　3.编写测试类：

　　[java] view
　　plaincopyprint?

　　package com.njupt.zhb.test;

　　public class TestMain {

　　public static void main(String[] args) {

　　System.out.println("Hello, OpenCV");

　　// Load the native library.

　　System.loadLibrary("opencv_java246");

　　new DetectFaceDemo().run();

　　}

　　}

　　//运行结果：

　　//Hello, OpenCV

　　//

　　//Running DetectFaceDemo

　　///E:/eclipse_Jee/workspace/JavaOpenCV246/bin/com/njupt/zhb/test/lbpcascade_frontalface.xml

　　//Detected 8 faces

　　//Writing faceDetection.png
　　package com.njupt.zhb.test;
　　public class TestMain {
　　public static void main(String[] args) {
　　System.out.println("Hello, OpenCV");
　　// Load the native library.
　　System.loadLibrary("opencv_java246");
　　new DetectFaceDemo().run();
　　}
　　}
　　//运行结果：
　　//Hello, OpenCV
　　//
　　//Running DetectFaceDemo
　　///E:/eclipse_Jee/workspace/JavaOpenCV246/bin/com/njupt/zhb/test/lbpcascade_frontalface.xml
　　//Detected 8 faces
　　//Writing faceDetection.png

Answer 2

整个项目的结构图：

编写DetectFaceDemo.java,代码如下：

[java] view
plaincopyprint?

package com.njupt.zhb.test;

import org.opencv.core.Core;

import org.opencv.core.Mat;

import org.opencv.core.MatOfRect;

import org.opencv.core.Point;

import org.opencv.core.Rect;

import org.opencv.core.Scalar;

import org.opencv.highgui.Highgui;

import org.opencv.objdetect.CascadeClassifier;

//

// Detects faces in an image, draws boxes around them, and writes the results

// to "faceDetection.png".

//

public class DetectFaceDemo {

public void run() {

System.out.println("\nRunning DetectFaceDemo");

System.out.println(getClass().getResource("lbpcascade_frontalface.xml").getPath());

// Create a face detector from the cascade file in the resources

// directory.

//CascadeClassifier faceDetector = new CascadeClassifier(getClass().getResource("lbpcascade_frontalface.xml").getPath());

//Mat image = Highgui.imread(getClass().getResource("lena.png").getPath());

//注意：源程序的路径会多打印一个‘/’，因此总是出现如下错误

/*

* Detected 0 faces Writing faceDetection.png libpng warning: Image

* width is zero in IHDR libpng warning: Image height is zero in IHDR

* libpng error: Invalid IHDR data

*/

//因此，我们将第一个字符去掉

String xmlfilePath=getClass().getResource("lbpcascade_frontalface.xml").getPath().substring(1);

CascadeClassifier faceDetector = new CascadeClassifier(xmlfilePath);

Mat image = Highgui.imread(getClass().getResource("we.jpg").getPath().substring(1));

// Detect faces in the image.

// MatOfRect is a special container class for Rect.

MatOfRect faceDetections = new MatOfRect();

faceDetector.detectMultiScale(image, faceDetections);

System.out.println(String.format("Detected %s faces", faceDetections.toArray().length));

// Draw a bounding box around each face.

for (Rect rect : faceDetections.toArray()) {

Core.rectangle(image, new Point(rect.x, rect.y), new Point(rect.x + rect.width, rect.y + rect.height), new Scalar(0, 255, 0));

}

// Save the visualized detection.

String filename = "faceDetection.png";

System.out.println(String.format("Writing %s", filename));

Highgui.imwrite(filename, image);

}

}
package com.njupt.zhb.test;
import org.opencv.core.Core;
import org.opencv.core.Mat;
import org.opencv.core.MatOfRect;
import org.opencv.core.Point;
import org.opencv.core.Rect;
import org.opencv.core.Scalar;
import org.opencv.highgui.Highgui;
import org.opencv.objdetect.CascadeClassifier;

//
// Detects faces in an image, draws boxes around them, and writes the results
// to "faceDetection.png".
//
public class DetectFaceDemo {
public void run() {
System.out.println("\nRunning DetectFaceDemo");
System.out.println(getClass().getResource("lbpcascade_frontalface.xml").getPath());
// Create a face detector from the cascade file in the resources
// directory.
//CascadeClassifier faceDetector = new CascadeClassifier(getClass().getResource("lbpcascade_frontalface.xml").getPath());
//Mat image = Highgui.imread(getClass().getResource("lena.png").getPath());
//注意：源程序的路径会多打印一个‘/’，因此总是出现如下错误
/*
* Detected 0 faces Writing faceDetection.png libpng warning: Image
* width is zero in IHDR libpng warning: Image height is zero in IHDR
* libpng error: Invalid IHDR data
*/
//因此，我们将第一个字符去掉
String xmlfilePath=getClass().getResource("lbpcascade_frontalface.xml").getPath().substring(1);
CascadeClassifier faceDetector = new CascadeClassifier(xmlfilePath);
Mat image = Highgui.imread(getClass().getResource("we.jpg").getPath().substring(1));
// Detect faces in the image.
// MatOfRect is a special container class for Rect.
MatOfRect faceDetections = new MatOfRect();
faceDetector.detectMultiScale(image, faceDetections);

System.out.println(String.format("Detected %s faces", faceDetections.toArray().length));

// Draw a bounding box around each face.
for (Rect rect : faceDetections.toArray()) {
Core.rectangle(image, new Point(rect.x, rect.y), new Point(rect.x + rect.width, rect.y + rect.height), new Scalar(0, 255, 0));
}

// Save the visualized detection.
String filename = "faceDetection.png";
System.out.println(String.format("Writing %s", filename));
Highgui.imwrite(filename, image);
}
}

3.编写测试类：

[java] view
plaincopyprint?

package com.njupt.zhb.test;

public class TestMain {

public static void main(String[] args) {

System.out.println("Hello, OpenCV");

// Load the native library.

System.loadLibrary("opencv_java246");

new DetectFaceDemo().run();

}

}

//运行结果:

//Hello, OpenCV

//

//Running DetectFaceDemo

///E:/eclipse_Jee/workspace/JavaOpenCV246/bin/com/njupt/zhb/test/lbpcascade_frontalface.xml

//Detected 8 faces

//Writing faceDetection.png
package com.njupt.zhb.test;
public class TestMain {
public static void main(String[] args) {
System.out.println("Hello, OpenCV");
// Load the native library.
System.loadLibrary("opencv_java246");
new DetectFaceDemo().run();
}
}
//运行结果:
//Hello, OpenCV
//
//Running DetectFaceDemo
///E:/eclipse_Jee/workspace/JavaOpenCV246/bin/com/njupt/zhb/test/lbpcascade_frontalface.xml
//Detected 8 faces
//Writing faceDetection.png