Defining blobs and a blob detector

For our purposes, a blob simply has an image and label. The image is cv::Mat and the label is an unsigned integer. The label's default value is 0, which shall signify that the blob has not yet been classified. Create a new header file, Blob.h, and fill it with the following declaration of a Blob class:

#ifndef BLOB_H
#define BLOB_H

#include <opencv2/core.hpp>

class Blob
{
public:
  Blob(const cv::Mat &mat, uint32_t label = 0ul);
  
  /**
   * Construct an empty blob.
   */
  Blob();
  
  /**
   * Construct a blob by copying another blob.
   */
  Blob(const Blob &other);
  
  bool isEmpty() const;
  
  uint32_t getLabel() const;
  void setLabel(uint32_t value);
  
  const cv::Mat &getMat() const;
  int getWidth() const;
  int getHeight() const;
  
private:
  uint32_t label;
  
  cv::Mat mat;
};

#endif // BLOB_H

The image of Blob does not change after construction, but the label may change as a result of our classification process. Note...