Idemia Identity & Security France

Jonathan Milgram

Stéphane Gentric

Herve Chabanne

Emmanuel Prouff

Fantin Girard

Constance Morel

Cédric Thuillier

Franck Maurin

A parameter training method for a convolutional neural network (CNN) for classifying image type data representative of a biometric trait. The method includes the implementation, by a data processor of a server, the steps of (a) for at least one data item from an already classified training database, generation of several alternate versions of this data each by application of at least one transformation chosen from a set of reference transformations satisfying a statistical distribution of transformations observed in the training database and (b) training the parameters of the CNN, from the already classified training database augmented with said alternate versions of the data.

Parameter training method for a convolutional neural network

A biometric recognition method comprising the step of calculating a similarity score between a candidate biometric vector and a reference biometric vector, at least one of the two biometric vectors being quantified.

Biometric recognition method

A biometric recognition method, comprising the step of calculating a similarity score of a candidate biometric vector with a reference biometric vector. At least one of the biometric vectors is extracted using at least one neural network.

A method for secure learning of parameters of a convolution neural network, CNN, for data classification includes the implementation, by data processing of a first server, including receiving from a second server a base of already classified learning data, the learning data being homomorphically encrypted; learning in the encrypted domain, from the learning database, the parameters of a reference CNN including a non-linear layer (POLYNOMIAL) operating an at least two-degree polynomial function approximating an activation function; a batch normalization layer before each non-linear layer (POLYNOMIAL); and transmitting the learnt parameters to the second server, for decryption and use for classification.

Growing community of inventors

Courbevoie, France

Jonathan Milgram