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hog行人检测代码(HOG行人检测)

admin 发布:2022-12-19 19:48 130


本篇文章给大家谈谈hog行人检测代码,以及HOG行人检测对应的知识点,希望对各位有所帮助,不要忘了收藏本站喔。

本文目录一览:

求opencv中Hog行人检测视频中实现的C++代码!

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

hog特征为什么可以用于行人识别能不能用于其他识别

hog描述子在opencv中为HOGDescriptor。

2. 可以调用该描述子setSVMDetector方法给用于对hog特征进行分类的svm模型的系数赋值,这里的参数为HOGDescriptor::getDefaultPeopleDetector()时表示采用系统默认的参数,因为这些参数是用很多图片训练而来的。

3. 对输入图片进行行人检测时由于图片的大小不一样,所以要用到多尺度检测。这里是用hog类的方法detectMultiScale。参数解释如下:

HOGDescriptor::detectMultiScale(const GpuMat img, vectorRect found_locations, doublehit_threshold=0, Size win_stride=Size(), Size padding=Size(), double scale0=1.05, int group_threshold=2)

该函数表示对输入的图片img进行多尺度行人检测 img为输入待检测的图片;found_locations为检测到目标区域列表;参数3为程序内部计算为行人目标的阈值,也就是检测到的特征到SVM分类超平面的距离;参数4为滑动窗口每次移动的距离。它必须是块移动的整数倍;参数5为图像扩充的大小;参数6为比例系数,即滑动窗口每次增加的比例;参数7为组阈值,即校正系数,当一个目标被多个窗口检测出来时,该参数此时就起了调节作用,为0时表示不起调节作用。

4.  最后对检测出来的目标矩形框,要采用一些方法处理,比如说2个目标框嵌套着,则选择最外面的那个框。

5.  因为hog检测出的矩形框比实际人体框要稍微大些,所以需要对这些矩形框大小尺寸做一些调整。

0x7c812afb 处最可能的异常: Microsoft C++ 异常

boost (启动)::program_options(程序选项)

validation_error 接下来 提示的东西,或 括号里 提示的 便是具体错误。

应当是程序本身的bug.

hog行人检测代码的介绍就聊到这里吧,感谢你花时间阅读本站内容,更多关于HOG行人检测、hog行人检测代码的信息别忘了在本站进行查找喔。

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