1. A method for automatic assessment of contractile activity in a gastrointestinal (GI) tract, comprising: identifying an image frame sequence, said image frame sequence comprising a plurality of frames from an image stream captured along the GI tract; detecting a lumen area in image frames of said image frame sequence; detecting a dynamic event in the image frame sequence, the dynamic event showing a specified dynamic pattern related to the detected lumen area; and classifying the image frame sequence as a candidate corresponding to an intestinal contraction.