Abstract: The system comprises a computer server (SRC) and a data storage device (HD), the computer server (SRC) being connected to a data communication network (IT), such as the internet network, and authorizing user access. According to the invention, the system comprises a multi-dimensional type convolutive neural network (AI) ensuring indexing in a database of 3D digital models, using a neural model and a function for selecting at least one three-dimensional digital model (N3D, O3D) having at least one feature in common with an object represented by incoming 2D image data (I2D), the indexing resulting from a classification of incoming 2D image data into different classes of objects as a function of features that are recognized in the incoming 2D image data using the neural model.