2-DIMENSIONAL IMAGE-ANALYSIS OF THE SHAPE OF RICE AND ITS APPLICATIONTO SEPARATING VARIETIES

To analyze the shapes of brown rice and polished rice a series of meas urements by image processing on Japonica, Indica and Javanica types co mposed of four rice varieties with three polishing methods were carrie d out. Area, perimeter; maximum length, maximum width, compactness and elongation were measured. The maximum length, maximum width and elong ation of a rice particle defined here were different from the traditio nal dimensions such as length and width. Further separating the rice v arieties by the shape difference of a rice particle was examined. From the result of the investigation on brown rice and polished rice, sepa rating the rice varieties was possible at a probability level of 95.4% with combined dimensions and shape factors or with single ones.