在 OpenCV 中将矩阵的 SVD 分量相乘

我将SVD应用于CV_32FC1 cvMat，并修改了"u"组件中的一些值。现在我正在尝试将"u"、"w"和"vt"分量相乘以获得单个矩阵 A。但是OpenCV无法将矩阵相乘，并出现以下错误。

OpenCV Error: Assertion failed (type == B.type() && (type == CV_32FC1 || type == CV_64FC1 || type == CV_32FC2 || type == CV_64FC2)) in gemm, file /build/buildd/opencv-2.1.0/src/cxcore/cxmatmul.cpp, line 687
terminate called after throwing an instance of 'cv::Exception'
  what():  /build/buildd/opencv-2.1.0/src/cxcore/cxmatmul.cpp:687: error: (-215) type == B.type() && (type == CV_32FC1 || type == CV_64FC1 || type == CV_32FC2 || type == CV_64FC2) in function gemm

当我检查 SVD 对象中的矩阵类型时，它们的 type = 20，这与任何默认矩阵类型都不匹配。

#include <iostream>
#include <stdio.h>
#include "cv.h"
#include "highgui.h"
#include "constants.h"
const unsigned int MAX = 10000;
using namespace cv;
using namespace std;
int NO_FRAMES;
Mat resize_image(Mat &src, Mat img)
{
    Mat dst;
    resize(src, dst, Size(img.rows, img.cols));
    return dst;
}
bool check_exit()
{
     return (waitKey(27) > 0)?true:false;
}
int main(int argc, char ** argv)
{
    Mat rgb[MAX];
    Mat ycbcr[MAX];
    Mat wm_rgb[MAX];
    SVD svd[MAX];
    namedWindow("watermark",1);
    namedWindow("RGB", 2);
    namedWindow("YCBCR",3);
    namedWindow("u",4);
    namedWindow("w",5);
    namedWindow("vt",6);
    if (argc < 3)
    {
        cout<<"Video file required! (Supported formats: avi, mp4, mpeg)n";
        return 1;
    }
    VideoCapture capture(argv[1]);
    Mat watermark = imread(argv[2]);
    if(!capture.isOpened())
    {
        cout<<"Unable to open the video file!n";
        return 1;
    }
    int i=0;
        capture >> rgb[i];
    while(!rgb[i].empty())
    {
        imshow("RGB", rgb[i]);
        cvtColor(rgb[i], ycbcr[i], CV_RGB2YCrCb);
        imshow("YCBCR", ycbcr[i]);
        i++;
        capture >> rgb[i];
        if(check_exit())
            exit(0);
    }
    NO_FRAMES = i;
    watermark = resize_image(watermark, ycbcr[0]);
    VideoWriter writer("output.avi", CV_FOURCC('d', 'i', 'v', 'x'), 24.0, cvSize(ycbcr[0].cols, ycbcr[0].rows),  true);
    for(int i = 0; i < NO_FRAMES - 1; i++)
    {
        Mat dst(ycbcr[i].rows, ycbcr[i].cols, CV_32FC1);
        ycbcr[i].convertTo(dst, CV_32S); 
        SVD temp(dst, 5);
        imshow("u", temp.u);
        imshow("w", temp.w);
        imshow("vt", temp.vt);
        svd[i] = temp;
        if(check_exit())
            exit(0);
    }

    int j = 0, k = 0;
    for (i = 0; i < NO_FRAMES; i++)
    {
        for (int p = 0; p < svd[i].u.rows; p++)
        {
            for(int q = 0; q < svd[i].u.cols; q++)
            {
                if (p == q)
                {
                    if (j >= watermark.rows)
                    {
                        goto x;
                    }
                    if (k >= watermark.cols)
                    {
                        k = 0;
                        j++;
                    }
                    svd[i].u.at<float>(p, q) = watermark.at<float>(j,k);
                    k++;
                }
            }
        }
    }

x:  for (i = 0; i < NO_FRAMES; i++)
    {
        Mat A(rgb[0].rows, rgb[0].cols, CV_32FC1);
                //Here
                A = svd[i].u * svd[i].w * svd[i].vt;
        Mat B(A.rows, A.cols, CV_32FC1);
        cvtColor(A, B, CV_YCrCb2RGB);
        writer << B;
    }
    capture.release();
    return 0;
}