Image publisher node publishes empty header

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I am trying to make a node that can both capture omnidirectional images to unwrap them and subsequently publish the resulting image in a new topic. As of now, the capturing of images for unwrapping works correctly (as I also save the resulting images in the robot's computer and they look as they should), but attempting to publish that result nets me a black rectangle where the unwrapped image should be.

The code of the node:

#include <opencv2/opencv.hpp>
#include <vector>
#include <string>
#include <sstream>
#include <cmath>
#include <ros/ros.h>
#include <image_transport/image_transport.h>
#include <cv_bridge/cv_bridge.h>

double pi = 3.1415926535897932384626433832795;
int radius, valix, valiy, newx, newy;
double angular;
long numimage = 0;
std::string imcamino, nomfile;
std::ostringstream ss;
int interad = 229;
int exterad = 917;
int centerx = 613;
int centery = 490;

//Width and Height of the panoramic image
int widthdx = int(exterad*pi*2);
int heightdx = int(exterad - interad + 1);
cv::Mat image;
cv::Mat imdx(heightdx-1, widthdx-1, CV_8UC1); //Matrix to hold new image
cv_bridge::CvImageConstPtr imbuff; //Image buffer for ROS-OpenCV image conversion


void imageCallback(const sensor_msgs::ImageConstPtr& msg){ //Callback function to process and save panoramic images
    try{
        imbuff = cv_bridge::toCvCopy(msg, "mono8"); //Transforms ROS image to OpenCV image
    }
    catch(cv_bridge::Exception& e){
        ROS_ERROR("Could not convert from '%s' to 'mono8'.", msg->encoding.c_str()); //Error should the conversion fail
    }

    //Transform Omnidirectional image into a panoramic image
    for(valix = 0;valix < widthdx-1;valix++){
    angular = (valix*pi*2)/widthdx;
    for(valiy = 0;valiy < heightdx-1;valiy++){
        radius = int(interad + (heightdx - valiy));
        newx = int((radius*cos(angular)/2) + centerx);
        newy = int((radius*sin(angular)/2) + centery);
        imdx.at<uint8_t>(valiy,valix) = cv::Mat(imbuff->image).at<uint8_t>(newy,newx);
    }
    }
    //Save parameters
    cv::vector<int> compression_params;
    compression_params.push_back(CV_IMWRITE_JPEG_QUALITY);
    compression_params.push_back(100);
    //String for the filename
    ss << numimage;
    nomfile = ss.str();
    imcamino = "/home/p3at/datasetjorge/";
    imcamino += nomfile;
    imcamino += ".jpg";
    cv::imwrite(imcamino, imdx, compression_params); //Save image in the previously specified filepath
    numimage++;
    ss.str("");
    ss.clear();
}

int main(int argc, char **argv){
    ros::init(argc,argv,"image_storer");
    ros::NodeHandle nh;
    image_transport::ImageTransport it(nh);
    image_transport::Subscriber sub = it.subscribe("/image_raw", 1, imageCallback);
    image_transport::Publisher pub = it.advertise("/image_dewrapped", 1);
    sensor_msgs::ImagePtr msgf = cv_bridge::CvImage(std_msgs::Header(), "mono8", imdx).toImageMsg(); //Transforms OpenCV image to ROS Image Message
    while(nh.ok()){
        pub.publish(msgf); //Publish Image message in topic /image_dewrapped P.S.:Does not work properly
    }
    ros::spin();
}

the resulting "image" seen in image view:

Any help to being able to view the unwrapped image?