1. A method for automated video analysis in a video analysis system, the method comprising: storing a database comprising training data for a micro-expression classifier, wherein the training data comprises spatio-temporal local texture reference descriptors for a plurality of spontaneous facial micro-expressions, wherein spatio-temporal local texture reference descriptors associated with a micro-expression describe temporal dynamic features in consecutive reference video frames containing the micro-expression; acquiring an image sequence comprising a plurality of video frames; detecting a face in the plurality of video frames; extracting dynamic facial features from the plurality of video frames by computing spatio-temporal local texture descriptors for the plurality of video frames, wherein the spatio-temporal local texture descriptors describe temporal dynamic features acquired through comparison of a plurality of consecutive video frames of the image sequence; and comparing the computed spatio-temporal local texture descriptors with the spatio-temporal local texture reference descriptors and determining on the basis of their similarity whether or not the image sequence comprises a micro-expression.