Development of a Shape Evaluation Method and it’s Application for 4 Years in Chinese Yam using Image Analyses, —Shape Succession in Vegetative Reproduction—

Abstract

Chinese Yam is produced by vegetative reproduction and the tubers inherit the genetic shape-traits of the seed tubers. Shape is an important factor affecting commercial classification and price, and is thus the target of breeding and culture selection. Since market prices are vigorously dependent on shape, easy and accurate analyzing systems have been developed using 3-D image analyses and the image analysis soft ware, HALCON. A modified method of obtaining image data using the known cube model was carried out, and the accuracy of the values was calibrated. Consequently, simple and quantitative shape classification and evaluation methods using 4 different techniques were applied, and satisfactory results were obtained after comparison with the logistic regression analyses.