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Nowadays, the new technologies of image processing and Human Machine Interaction (HMI) are mostly linked to the scientific domains of research (medicine, transport, etc). Indeed, the emergence of the tactile interfaces as well as the gestural interfaces allows increasing the physical world which surrounds us with the digital information. It also allows us to use natural hand gestures to interact with this information which is a digital image. In this paper, we describe the basic concepts of the images processing as well as the HMI foundations. Then, we identify the gestural human interaction as well as its relation with the imaging.