An assistance device for image recognition, comprising: - a memory capable of storing a plurality of sets of descriptors (dij), each set corresponding to an image, - each descriptor (dij) being associated with a designated area of the image, and comprising first data of the vector type (xij), second data of the angle type (aij), and third data of the scalar type (sij), - a first operator capable of receiving a designation of two descriptors (dij) and of establishing a Boolean variable reflecting the verification of a similarity criterion of the descriptor vectors (xij), from a comparison between the first data of these descriptors, - a second operator capable of receiving a designation of two descriptors (dij) and of establishing a rotation angle parameter (DeltaA) from the second respective data (aij) of both descriptors (dij), - a third operator capable of receiving a designation of two descriptors (dij) and of establishing a scale factor parameter (DeltaS) from the third data of these descriptors (sij), - a controller capable of receiving the designations of a first and of a second set of descriptors (dij), and laid out so as to apply the first operator to each pair formed by a descriptor (dij) of the first set, and by a descriptor of the second set (dij), in order to infer therefrom a list of pairs of similar descriptors, - calling the second operator and the third operator for each of the pairs of descriptors of said list and storing in memory the whole of the obtained parameters, and - an estimator of the likeness between the images respectively corresponding to the first and to the second set of descriptors (dij), from statistical processing on said set of parameters. - a memory capable of storing a plurality of sets of descriptors (dij), each set corresponding to an image, - each descriptor (dij) being associated with a designated area of the image, and comprising first data of the vector type (xij), second data of the angle type (aij), and third data of the scalar type (sij), - a first operator capable of receiving a designation of two descriptors (dij) and of establishing a Boolean variable reflecting the verification of a similarity criterion of the descriptor vectors (xij), from a comparison between the first data of these descriptors, - a second operator capable of receiving a designation of two descriptors (dij) and of establishing a rotation angle parameter (DeltaA) from the second respective data (aij) of both descriptors (dij), - a third operator capable of receiving a designation of two descriptors (dij) and of establishing a scale factor parameter (DeltaS) from the third data of these descriptors (sij), - a controller capable of receiving the designations of a first and of a second set of descriptors (dij), and laid out so as to apply the first operator to each pair formed by a descriptor (dij) of the first set, and by a descriptor of the second set (dij), in order to infer therefrom a list of pairs of similar descriptors, - calling the second operator and the third operator for each of the pairs of descriptors of said list and storing in memory the whole of the obtained parameters, and - an estimator of the likeness between the images respectively corresponding to the first and to the second set of descriptors (dij), from statistical processing on said set of parameters.