GRADING OF YEMENI RAISIN (RAZIGI CV.) Using Non-Contact Machine Vision Techniques | ||||
Fayoum Journal of Agricultural Research and Development | ||||
Article 28, Volume 23, Issue 1, January 2009, Page 86-93 PDF (360.6 K) | ||||
Document Type: Research articles. | ||||
DOI: 10.21608/fjard.2009.197039 | ||||
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Authors | ||||
M. S. El-Faki1; M. H. Al-Hazami2 | ||||
1Agricultural Engineering Department, Faculty of Agriculture, Sana'a University | ||||
2Horticulture Department, Faculty of Agriculture, Sana'a University Republic of Yemen | ||||
Abstract | ||||
This research aimed at establishing quality standards for noncontact grading of Yemeni raisin (Vitis vinifera) of Razigi variety, by developing a digital image processing algorithm based on color and shape information. This was accomplished through developing preprocessing procedures to segment transparent interior areas in raisin color images as the regions of interest and highlight their morphology for extracting shape features. A distinct signature for each raisin grade was generated by calculating number of matches of a set of twenty selected morphological features. A minimum distance classifier was developed, trained and tested in grading raisins by sorting them into three grades, namely, A, B, and C. The classifier was successful in sorting two raisin grades, namely, A and C with 100% CCR and 0% MCR for each. Its performance was not good enough in sorting raisins of grade B as the CCR dropped to 50%. Some difficulties were encountered by the classifier in sorting half of the raisins of grade B due to their great similarity with grade A raisins. The developed algorithm confirmed its perfect performance in distinguishing between grades A and C, and successfully initiated quality standards for grading raisins using non-contact machine vision techniques with the need for some improvement to extend its precision to encompass grade B. | ||||
Keywords | ||||
Raisin; Quality standards; Non-contact grading; Machine vision; Color information; Transparent areas; Region structural shape | ||||
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