Gesture stroke recognition in touch-based user interface input

A method for recognizing gesture strokes in user input applied onto an electronic document via a touch-based user interface, comprising:

• receiving data generated based on the user input, the data representing a stroke and comprising a plurality of ink points in a rectangular coordinate space and a plurality of timestamps associated respectively with the plurality of ink points;
• segmenting the plurality of ink points into a plurality of segments each corresponding to a respective sub-stroke of the stroke and comprising a respective subset of the plurality of ink points;
• determining at least one scale of the electronic document;
• generating a plurality of feature vectors based respectively on the plurality of segments, the feature vectors comprising features of the segments;
• normalizing a subset of the features of the feature vectors according to the at least one scale;
• and
• applying the plurality of feature vectors as an input sequence representing the stroke to a trained stroke classifier to generate a vector of probabilities including a probability that the stroke is a non-gesture stroke and a probability that the stroke is a given gesture stroke of a set of gesture types.