1. A method, comprising: imaging an object in three-dimensions; binning data of the imaged object into three-dimensional regions having a predetermined size; determining a density value p of the data in each bin; inputting the p density values of the bins into a first layer of a computational system including a corresponding processing element for each of the bins; calculating an output O of the processing elements of the computational system while restricting the processing elements to have weights Wc 1 connecting the processing elements to the corresponding p density values; and communicating an estimated class of the scanned object based on the calculated system outputs.