[转载]Kinect+OpenNI学习笔记之5(使用OpenNI自带的类进行简单手势识别) - tornadomeet - 博客园

status = gesture_generator.Create(context);

        if(CheckError("Create gesture generator error!")) {

            return false;

        }

        /*添加手势识别的种类*/

        gesture_generator.AddGesture("Wave", NULL);

        gesture_generator.AddGesture("click", NULL);

        gesture_generator.AddGesture("RaiseHand", NULL);

        gesture_generator.AddGesture("MovingHand", NULL);

#include <XnCppWrapper.h>
#include <QtGui/QtGui>
#include <iostream>

using namespace xn;
using namespace std;

class COpenNI
{
public:
    ~COpenNI() {
        context.Release();//释放空间
    }
    bool Initial() {
        //初始化
        status = context.Init();
        if(CheckError("Context initial failed!")) {
            return false;
        }
        context.SetGlobalMirror(true);//设置镜像
        //产生图片node
        status = image_generator.Create(context);
        if(CheckError("Create image generator  error!")) {
            return false;
        }
        //产生深度node
        status = depth_generator.Create(context);
        if(CheckError("Create depth generator  error!")) {
            return false;
        }
        //视角校正
        status = depth_generator.GetAlternativeViewPointCap().SetViewPoint(image_generator);
        if(CheckError("Can't set the alternative view point on depth generator!")) {
            return false;
        }
        status = gesture_generator.Create(context);
        if(CheckError("Create gesture generator error!")) {
            return false;
        }
        /*添加手势识别的种类*/
        gesture_generator.AddGesture("Wave", NULL);
        gesture_generator.AddGesture("click", NULL);
        gesture_generator.AddGesture("RaiseHand", NULL);
        gesture_generator.AddGesture("MovingHand", NULL);
        return true;

    }

    bool Start() {
        status = context.StartGeneratingAll();
        if(CheckError("Start generating error!")) {
            return false;
        }
        return true;
    }

    bool UpdateData() {
        status = context.WaitNoneUpdateAll();
        if(CheckError("Update date error!")) {
            return false;
        }
        //获取数据
        image_generator.GetMetaData(image_metadata);
        depth_generator.GetMetaData(depth_metadata);

        return true;
    }

public:
    DepthMetaData depth_metadata;
    ImageMetaData image_metadata;
    GestureGenerator gesture_generator;//外部要对其进行回调函数的设置，因此将它设为public类型

private:
    //该函数返回真代表出现了错误，返回假代表正确
    bool CheckError(const char* error) {
        if(status != XN_STATUS_OK ) {
            QMessageBox::critical(NULL, error, xnGetStatusString(status));
            cerr << error << ": " << xnGetStatusString( status ) << endl;
            return true;
        }
        return false;
    }

private:
    XnStatus    status;
    Context     context;
    DepthGenerator  depth_generator;
    ImageGenerator  image_generator;
};

#include <QCoreApplication>

#include "opencv2/highgui/highgui.hpp"
#include "opencv2/imgproc/imgproc.hpp"
#include <opencv2/core/core.hpp>
#include "copenni.cpp"

#include <iostream>

using namespace cv;
using namespace xn;

Mat depth_image;
Mat depth_image_result;//深度结果图，且在该图上显示手势动作的类型
COpenNI openni;
bool test_flag = false;

// callback function for gesture recognized
//回调函数，该函数的函数名字可以随便取，但是其参数的格式必须不能改变
//这里该函数的作用是表示上面4种手势发生完成后调用
void  XN_CALLBACK_TYPE  GRecognized ( xn::GestureGenerator &generator,
                                    const XnChar *strGesture,
                                    const  XnPoint3D *pIDPosition,
                                    const  XnPoint3D *pEndPosition,
                                    void *pCookie )
{
    depth_image_result = depth_image.clone();
    putText(depth_image_result, strGesture, Point(50, 150), 3, 0.8, Scalar(255, 0, 0), 2 );
    test_flag = true;
}

// callback function for gesture progress
//该函数表示上面4种手势某一种正在发生时调用
void  XN_CALLBACK_TYPE  GProgress ( xn::GestureGenerator &generator,
                                  const XnChar *strGesture,
                                  const  XnPoint3D *pPosition,
                                 XnFloat fProgress,
                                 void *pCookie )
{
    ;
}

int main (int argc, char **argv)
{

    if(!openni.Initial())
        return 1;
    XnCallbackHandle handle;
    openni.gesture_generator.RegisterGestureCallbacks(GRecognized, GProgress, NULL, handle);
    if(!openni.Start())
        return 1;
    namedWindow("depth image", CV_WINDOW_AUTOSIZE);
    putText(depth_image, "YES!", Point(50, 150), 3, 0.8, Scalar(255, 0, 0), 2 );
    while(1) {
        if(!openni.UpdateData()) {
            return 1;
        }
        /*获取并显示深度图像,且这2句代码不能放在回调函数中调用，否则后面的imshow函数会因为执行时找不到图片（因为此时回调函数不一定执行了）而报错*/
        Mat depth_image_src(openni.depth_metadata.YRes(), openni.depth_metadata.XRes(),
                            CV_16UC1, (char *)openni.depth_metadata.Data());//因为kinect获取到的深度图像实际上是无符号的16位数据
        depth_image_src.convertTo(depth_image, CV_8U, 255.0/8000);

        if(!test_flag)
            imshow("depth image", depth_image);
        else
            imshow("depth image", depth_image_result);
        waitKey(30);
        test_flag = false;
    }

}