MATRACK: block sparse Bayesian learning for a sketch recognition approach

Human-computer interaction has become increasingly easy and popular using widespread smart devices. Gestures and sketches as the trajectory of hands in 3D space are among the popular interaction media. Therefore, their recognition is essential. However, diversity of human gestures along with the lack of visual cues make the sketch recognition process challenging. This paper aims to develop an accurate sketch recognition algorithm using Block Sparse Bayesian Learning (BSBL). Sketches are acquired from three datasets using a Wii-mote in a virtual-reality environment. We evaluate the performance of the proposed sketch recognition approach (MATRACK) on diverse sketch datasets. Comparisons are drawn with three high accuracy classifiers namely, Hidden Markov Model (HMM), Principle Component Analysis (PCA) and K-Nearest Neighbour (K-NN). MATRACK, the developed BSBL based sketch recognition system, outperforms k-NN, HMM and PCA. Specifically, for the most diverse dataset, MATRACK reaches the accuracy of 93.5%, where other three classifiers approximately catches 80% accuracy.