1. A method comprising: obtaining a series of frames of image data relating to a region of interest including a pleural interface of a lung, the image data including at least a first frame and a second frame; identifying, via processing circuitry, the pleural interface in at least the first frame and the second frame; determining, based on computing optical flow between the first and second frames, a pleural sliding classification of the image data at the pleural interface; and determining whether a pneumothorax is present in the pleural interface based on the pleural sliding classification.