Semantic feature representation and interpretation with context-free grammar and push-down automaton

Two key research issues are addressed: (i) A semantic representation and interpretation framework by using a lightweight self-supervised learning approach, namely the Context-Free Grammar and Push-Down Automaton; and (ii) A mobile phone App implementation of B-mode medical ultrasound imaging with a handheld probe, which can make use of the learned semantic features of scanned images for future home-based health screening.