An apparatus and method for the proximity photolithography of large substrates is provided. This new variety of black walnut tree was discovered by the applicant near South Raub, Tippecanoe County, Ind. The invention then divides the length of input signal into a plurality of T-length periods and performs a discrete Fourier transform on the signal within each T-length period. The method includes the steps of: identifying candidate nodule locations in the nodule-bone image; segmenting a region around each candidate nodule location in the nodule-bone image; and using the features of the segmented region to determine if a candidate is a nodule.