Elliptic Fourier based analysis and multivariate approaches for size and shape distinctions of walnut (Juglans regia L.) cultivars

Creative Commons License

Demir B., Sayıncı B., Çetin N., Yaman M., Çömlek R., Aydın Y., ...More

GRASAS Y ACEITES, vol.69, 2018 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 69
  • Publication Date: 2018
  • Doi Number: 10.3989/gya.0104181
  • Journal Name: GRASAS Y ACEITES
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Keywords: Dimensional analysis, Image processing, Physical attribute, Projected area, Shape descriptor, Shape index, QUANTITATIVE-EVALUATION, FRUIT SHAPE, GENOTYPES, ORANGE
  • Erciyes University Affiliated: Yes


Size and shape data of agricultural crops provide great sources for food processing technologies. The physical attributes of different fruits should be known for the design, developing and innovation of food technologies. In this study, the size and shape distinctions of fifteen national and international walnut cultivars (Midland, Sutyemez-1, Serr, Maras-18, Maras-12, Sutyemez-2, Kaman-1, Kaman-5, Pedro, Howard, Chandler, Sebin, Sen-2, Bilecik and KR-1) were determined using elliptic Fourier and multivariate approaches. Firstly, the gravitational features of walnut cultivars were determined, and their dimensional, area and shape attributes were revealed by image processing. Cluster analysis was used to designate the walnut cultivars. Elliptic Fourier descriptors obtained from walnut outlines provided the comparisons among walnut cultivars in shape. The shape index indicated that Serr, Sutyemcz-2, Midland and Sen-2 cultivars were oval-shaped, and the others were spherical. The cluster analysis divided the walnut cultivars into four subgroups. Elliptic Fourier descriptors perfectly distinguished the walnut cultivars according to shape.