1. A computer-implemented feature extraction method for classifying pixels of a digitized pathology image, the method to be performed by a system comprising at least one processor and at least one memory, the method comprising: generating a plurality of characterized pixels from a digitized pathology image; determining by the system in a first step feature analysis a first region and a first remainder region of the digitized pathology image based on the plurality of characterized pixels; determining by the system, in a plurality of subsequent feature analysis steps, subsequent regions and subsequent remainder regions, wherein each feature analysis step determines a corresponding image region and a corresponding remainder region based on a remainder region determined by an earlier feature analysis step; and classifying by the system part or all of the digitized pathology image based on the determined first region, and the determined subsequent regions.