A data processing method includes reading first to-be-processed data from a first storage unit into a second storage unit, computing a processing result according to the first to-be-processed data stored in the second storage unit, and, while computing the processing result, reading second to-be-processed data from the first storage unit. The first to-be-processed data is at a first layer of one or more image pyramids having a plurality of layers, and the second to-be-processed data is at a second layer of the one or more image pyramids.