为什么 face_detection 处理示例不起作用？

Question

我目前正在尝试学习 this 人脸检测教程。据我所知，我确信我的 opencv 依赖项是正确的。当我运行来自 opencv 处理示例的 face_detection 示例时，我收到以下错误消息：

Display -1 does not exist, using the default display instead.
Exception in thread "Animation Thread" java.lang.NoSuchMethodError: processing.core.PApplet.registerMethod(Ljava/lang/String;Ljava/lang/Object;)V
at hypermedia.video.OpenCV.<init>(OpenCV.java:297)
at face_detection.setup(face_detection.java:39)
at processing.core.PApplet.handleDraw(Unknown Source)
at processing.core.PApplet.run(Unknown Source)
at java.lang.Thread.run(Thread.java:662)

这只是我的网络摄像头没有被识别吗？我不明白该错误消息，并且试图落后它几个小时并没有让我走得太远。我正在使用 opencv 1.0 并处理 1.5.1.

此处是 face_detection 示例代码：

import hypermedia.video.*;
import java.awt.Rectangle;


OpenCV opencv;

// contrast/brightness values
int contrast_value    = 0;
int brightness_value  = 0;



void setup() {

    size( 320, 240 );

    opencv = new OpenCV( this );
    opencv.capture( width, height );                   // open video stream
    opencv.cascade( OpenCV.CASCADE_FRONTALFACE_ALT );  // load detection description, here-> front face detection : "haarcascade_frontalface_alt.xml"


    // print usage
    println( "Drag mouse on X-axis inside this sketch window to change contrast" );
    println( "Drag mouse on Y-axis inside this sketch window to change brightness" );

}


public void stop() {
    opencv.stop();
    super.stop();
}



void draw() {

    // grab a new frame
    // and convert to gray
    opencv.read();
    opencv.convert( GRAY );
    opencv.contrast( contrast_value );
    opencv.brightness( brightness_value );

    // proceed detection
    Rectangle[] faces = opencv.detect( 1.2, 2, OpenCV.HAAR_DO_CANNY_PRUNING, 40, 40 );

    // display the image
    image( opencv.image(), 0, 0 );

    // draw face area(s)
    noFill();
    stroke(255,0,0);
    for( int i=0; i<faces.length; i++ ) {
        rect( faces[i].x, faces[i].y, faces[i].width, faces[i].height ); 
    }
}



/**
 * Changes contrast/brigthness values
 */
void mouseDragged() {
    contrast_value   = (int) map( mouseX, 0, width, -128, 128 );
    brightness_value = (int) map( mouseY, 0, width, -128, 128 );
}

Answer 1

让我们从错误开始：

Exception in thread "Animation Thread" java.lang.NoSuchMethodError: processing.core.PApplet.registerMethod(Ljava/lang/String;Ljava/lang/Object;)V at hypermedia.video.OpenCV.(OpenCV.java:297)

看起来这个 OpenCV Processing 包装器正在调用 Processing 的 registerMethod() 而核心库没有它。这可能是您正在使用的 Processing 版本和超媒体 OpenCV 包装器的不兼容问题。请记住，这个包装纸现在已经很旧了。

我推荐使用 Greg Borenstein's OpenCV Processing library，您可以通过 Sketch > Import Library... > Add Library... 轻松安装到 Processing 2+ 并搜索 用于处理的 OpenCV。库完成安装后，您应该可以运行 FaceDetection 示例。

为什么 face_detection 处理示例不起作用？

Why is face_detection processing example not working?

java

processing

opencv

arduino