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Abstract

Ethiopia, known as the birthplace of coffee, relies on coffee exports as a major source of foreign currency. This research paper focuses on developing a hybrid feature mining technique to automatically classify Ethiopian coffee beans based on their provenance: Harrar, Jimma, Limu, Sidama, and Wellega, which correspond to their botanical origins. A dataset of coffee bean images is collected from various regions through the Ethiopian Commodity Exchange (ECX) in Addis Ababa. The proposed system incorporates preprocessing phases including image resizing, filtering, contrast enhancement, noise removal, grayscale conversion, and segmentation using a combined thresholding and K-means approach for grayscale and RGB images, respectively. Classification is performed using a radial basis function (RBF) kernel function of support vector machine (SVM). To address the color-feature similarity challenge, the study explores merging color and texture features using the histogram of oriented gradients (HOG) local feature descriptor. Performance evaluation is conducted for HOG feature extraction, CNN feature extraction, and a hybrid feature vector (HOG-CNN) using a multi-class SVM classifier, achieving accuracies of 74.17%, 85.83%, and 97.5%, respectively. The deep-shallow-based feature (CNN-HOG) combination demonstrates the highest accuracy of 97.5% in this study. The findings highlight the effectiveness of the proposed hybrid feature mining approach in automatically classifying Ethiopian coffee bean varieties, with potential applications in quality control and traceability within the coffee industry.

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Title
CNN-HOG based hybrid feature mining for classification of coffee bean varieties using image processing
Publication title
Volume
84
Issue
2
Pages
749-764
Publication year
2025
Publication date
Jan 2025
Publisher
Springer Nature B.V.
Place of publication
Dordrecht
Country of publication
Netherlands
ISSN
13807501
e-ISSN
15737721
Source type
Scholarly Journal
Language of publication
English
Document type
Journal Article
Publication history
 
 
Online publication date
2024-04-02
Milestone dates
2024-03-14 (Registration); 2023-06-15 (Received); 2024-03-13 (Accepted); 2024-03-02 (Rev-Recd)
Publication history
 
 
   First posting date
02 Apr 2024
ProQuest document ID
3160234319
Document URL
https://www.proquest.com/scholarly-journals/cnn-hog-based-hybrid-feature-mining/docview/3160234319/se-2?accountid=208611
Copyright
Copyright Springer Nature B.V. Jan 2025
Last updated
2025-04-21
Database
ProQuest One Academic