A display device for displaying sub-surface structures comprising: - acquisition means configured to acquire images of at least part of the body of a user or of an object from acquisition signals defining a pre-determinable multispectral radiation band, - a processor configured and to extract, from such images , reference signals including first surface and/or sub-surface localization points defined by said part of said body or said object, - a database operationally connected to said processor and including a plurality of models of sub-surface structures of said part of said body or said object, each defining predetermined configurations of second localization points , - said processor being configured to compare each of said models with said reference signals and select one of said models in which said second localization points match more with said first localization points , and said device further comprising: - display means configured to make at least one of said images accessible to an operator in real time and to make accessible to said operator also said model selected in such a way that said operator can see, in real time, the sub-surface structure of said part of said body or said object, and wherein: - said processor is configured to coordinate said acquisition means and said display means , and - said models are predetermined anatomic models including, for instance, facial muscles, or face veins, or nerves so that to define different configurations at different depths potentially of the same body part, - said models are three-dimensional and each of said images is acquired at a respective wavelength of said acquisition signals, the respective wavelengths of each of each of said images being different from each other, in such a way as to produce, by reconstructing a vector determined by all said images, three-dimensional reference signals defining a mapping of said part of said body. - acquisition means configured to acquire images of at least part of the body of a user or of an object from acquisition signals defining a pre-determinable multispectral radiation band, - a processor configured and to extract, from such images , reference signals including first surface and/or sub-surface localization points defined by said part of said body or said object, - a database operationally connected to said processor and including a plurality of models of sub-surface structures of said part of said body or said object, each defining predetermined configurations of second localization points , - said processor being configured to compare each of said models with said reference signals and select one of said models in which said second localization points match more with said first localization points , - display means configured to make at least one of said images accessible to an operator in real time and to make accessible to said operator also said model selected in such a way that said operator can see, in real time, the sub-surface structure of said part of said body or said object, - said processor is configured to coordinate said acquisition means and said display means , and - said models are predetermined anatomic models including, for instance, facial muscles, or face veins, or nerves so that to define different configurations at different depths potentially of the same body part, - said models are three-dimensional and each of said images is acquired at a respective wavelength of said acquisition signals, the respective wavelengths of each of each of said images being different from each other, in such a way as to produce, by reconstructing a vector determined by all said images, three-dimensional reference signals defining a mapping of said part of said body. <EOS>