title: Supervised neural network classification of pre-sliced cooked pork ham images using quaternionic singular values.
abstract: The quaternionic singular value decomposition is a technique to decompose a quaternion matrix (representation of a colour image) into quaternion singular vector and singular value component matrices exposing useful properties. The objective of this study was to use a small portion of uncorrelated singular values, as robust features for the classification of sliced pork ham images, using a supervised artificial neural network classifier. Images were acquired from four qualities of sliced cooked pork ham typically consumed in Ireland (90 slices per quality), having similar appearances. Mahalanobis distances and Pearson product moment correlations were used for feature selection. Six highly discriminating features were used as input to train the neural network. An adaptive feedforward multilayer perceptron classifier was employed to obtain a suitable mapping from the input dataset. The overall correct classification performance for the training, validation and test set were 90.3%, 94.4%, and 86.1%, respectively. The results confirm that the classification performance was satisfactory. Extracting the most informative features led to the recognition of a set of different but visually quite similar textural patterns based on quaternionic singular values.
authors.affiliation: FRCFT Group, Biosystems Engineering, Agriculture and Food Science Centre, School of Agriculture Food Science and Veterinary Medicine, University College Dublin, Belfield, Dublin 4, Ireland.
authors.forename: Nektarios A
authors.initials: NA
authors.lastname: Valous
authors.forename: Fernando
authors.initials: F
authors.lastname: Mendoza
authors.forename: Da-Wen
authors.initials: DW
authors.lastname: Sun
authors.forename: Paul
authors.initials: P
authors.lastname: Allen
mesh_terms: D000818:Animals; D003116:Color; D003296:Cooking; D007091:Image Processing, Computer-Assisted / Q000379:methods*; D007494:Ireland; D008460:Meat; D015233:Models, Statistical; D018482:Muscle, Skeletal; D016571:Neural Networks, Computer; D015203:Reproducibility of Results; D013552:Swine