首页 文章

3D将深度映射到RGB(Kinect OpenNI Depthmap到OpenCV RGB Cam)

提问于
浏览
0

我正在尝试将我的OpenNI(1.5.4.0)Kinect 4 Windows Depthmap映射到OpenCV RGB图像 .

我有深度为mm的Depthmap 640x480,试图像Burrus一样进行映射:http://burrus.name/index.php/Research/KinectCalibration

我跳过了失真部分,但除此之外,我做了我认为的一切:

//with depth camera intrinsics, each pixel (x_d,y_d) of depth camera can be projected
//to metric 3D space. with fx_d, fy_d, cx_d and cy_d the intrinsics of the depth camera. 

P3D.at<Vec3f>(y,x)[0] = (x - cx_ir) * depth/fx_ir;
P3D.at<Vec3f>(y,x)[1] = (y - cy_ir) * depth/fy_ir;
P3D.at<Vec3f>(y,x)[2] = depth;


//P3D' = R.P3D + T:
RTMat = (Mat_<float>(4,4) << 0.999388, -0.00796202, -0.0480646, -3.96963,
0.00612322, 0.9993536, 0.0337474, -22.8512,
0.0244427, -0.03635059, 0.999173, -15.6307,
0,0,0,1);

perspectiveTransform(P3D, P3DS, RTMat);

//reproject each 3D point on the color image and get its color:  
depth = P3DS.at<Vec3f>(y,x)[2];
x_rgb =  (P3DS.at<Vec3f>(y,x)[0] * fx_rgb/ depth + cx_rgb;
y_rgb = (P3DS.at<Vec3f>(y,x)[1] * fy_rgb/ depth + cy_rgb;

但是根据我对Kinect的RGB相机和红外热像仪的估计校准值,我的结果在每个方向都失败了,只有在改变外在T参数时才能修复 .

我有一些怀疑:

  • OpenNi是否已将红外深度图映射到Kinect的RGB相机?

  • 我应该使用以米为单位的深度,还是将像素转换为mm? (我尝试乘以pixel_size * 0.001,但我得到了相同的结果)

真的希望有人可以帮助我 . Thx提前 .

1 回答

  • 1

    AFAIK OpenNI自己进行注册(出厂设置),您也可以切换注册 . 如果您使用OpenNI支持构建OpenCV,它就像这样简单:

    capture.set(CV_CAP_PROP_OPENNI_REGISTRATION,1);
    

    正如here所解释的那样,有一个最小的OpenNI / OpenCV示例here . 所以最小的工作样本看起来像这样:

    #include "opencv2/core/core.hpp"
    #include "opencv2/highgui/highgui.hpp"
    
    #include <iostream>
    
    using namespace cv;
    using namespace std;
    
    int main(){
        VideoCapture capture;
        capture.open(CV_CAP_OPENNI);
        //registration
        if(capture.get( CV_CAP_PROP_OPENNI_REGISTRATION ) == 0) capture.set(CV_CAP_PROP_OPENNI_REGISTRATION,1);
    
        if( !capture.isOpened() ){
            cout << "Can not open a capture object." << endl;
            return -1;
        }
        cout << "ready" << endl;
    
        for(;;){
            Mat depthMap,depthShow;
            if( !capture.grab() ){
                cout << "Can not grab images." << endl;
                return -1;
            }else{
                if( capture.retrieve( depthMap, CV_CAP_OPENNI_DEPTH_MAP ) ){
                    const float scaleFactor = 0.05f;
                    depthMap.convertTo( depthShow, CV_8UC1, scaleFactor );
                    imshow("depth",depthShow);
                }
            }
            if( waitKey( 30 ) == 27 )    break;//esc to exit
        }
    
    }
    

    如果您没有使用OpenNI支持构建的OpenCV,您应该能够使用GetAlternativeViewPointCap()

相关问题