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- Title
THE DEVELOPMENT OF A MACHINE VISION SYSTEM FOR SHIITAKE GRADING.
- Authors
Ho-Hsien Chen; Ching-Hua Ting
- Abstract
A grading system was developed to classify shiitake automatically into various grades of quality in terms of size, shape and color. A shiitake is scanned with a color charge-coupled-device camera and then various geometrical and color characteristics are determined by image processing. The online grading procedure includes the following sequences in processing dried shiitake: (a) color abnormality is eliminated by image analysis; (b) broken caps are detected by calculation of the area-to-perimeter ratio; and (c) size is determined by pixel counting from the bottom view. Image processing and algorithmic manipulations are done on a personal computer (PC) while grading is carried out by a programmable logic controller (PLC). The PLC accepts grading instructions from the PC, hence controls the grading mechanisms. Pilot system validation was done on 250 dried shiitake samples and resulted in a 97.6% accuracy rate. This result is better than that by visual inspection. A complete grading cycle takes 4.8 s, of which the PC unit participates 0.3–0.7 s depending on the physical complexity of the shiitake being processed.
- Subjects
FARM produce grading; VEGETABLE grading; SHIITAKE; COMPUTER vision; IMAGE processing; GRADING (Commercial products)
- Publication
Journal of Food Quality, 2004, Vol 27, Issue 5, p352
- ISSN
0146-9428
- Publication type
Article
- DOI
10.1111/j.1745-4557.2004.00642.x