       \param dz Checked image depth.
       \param dc Checked image spectrum.
    **/
    bool is_sameNXYZC(const unsigned int n,
                      const unsigned int dx, const unsigned int dy,
       \param dz Checked image depth.
       \param dc Checked image spectrum.
    **/
    bool is_sameNXYZC(const unsigned int n,
                      const unsigned int dx, const unsigned int dy,