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Though deep convolutional neural networks (CNNs) have made great breakthroughs in the field of vision-based gesture recognition, however it is challenging to deploy these high-performance networks to resource-constrained mobile platforms and acquire large numbers of labeled samples for deep training of CNNs. Furthermore, there are some application scenarios with only a few samples or even a single one for a new gesture class so that the recognition method based on CNNs cannot achieve satisfactory classification performance. In this paper, a well-designed lightweight network based on I3D with spatial-temporal separable 3D convolutions and Fire module is proposed as an effective tool for the extraction of discriminative features. Then some effective capacity by deep training of large samples from related categories can be transferred and utilized to enhance the learning ability of the proposed network instead of training from scratch. In this way, the implementation of one-shot learning hand gesture recognition (OSLHGR) is carried out by a rational decision with distance measure. Moreover, a kind of mechanism of discrimination evolution with innovation of new sample and voting integration based on multi-classifiers is established to improve the learning and classification performance of the proposed method. Finally, a series of experiments and tests on the IsoGD and Jester datasets are conducted to demonstrate the effectiveness of our improved lightweight I3D. Meanwhile, a specific dataset of gestures with variant angles and directions, BSG 2.0, and the ChaLearn gesture dataset (CGD) are used for the test of OSLHGR. The results on different experiment platforms verify and validate the performance advantages of satisfied classification and real-time response speed.

One-Shot Learning Hand Gesture Recognition Based on Lightweight 3D Convolutional Neural Networks for Portable Applications on Mobile Systems