Quality
Grading |
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Two grading criteria used
in determining shrimp product quality and value by
the shrimp industry are: 1. Presence or percentage
of black spot, measured as a percentage of the
total body surface. 2. Shape quality
referring to whole shrimp and broken pieces.
Black spots (melanoma) on the shrimp surface are
evidence of aging shrimp and are considered
defects that must be removed from the main
production line. Shape quality is measured as the
size and the completeness of the body. Broken
shrimp pieces are considered a product defect and
also must be removed from the main production
line. Black spot detection is a simple task
for a well-designed machine vision system, which
provides consistent and controlled lighting. Shape
analysis, on the other hand, is a challenging task
because it involves contour extraction and shape
analysis. In this paper, a simple, fast, and
accurate shape analysis method using Turn Angle
Cross-correlation is developed for shrimp quality
evaluation. Our analysis results validate that the
performance of the proposed shape analysis method
is suitable for real-time inspection for
commercial applications.
Quality evaluation of agricultural and food
products is important for processing, inventory
control, and marketing. Fruit size and skin
delamination are two important quality factors for
the date industry, especially for high quality
dates such as Medjools. Unlike other near
infrared spectrometric approaches, the developed
machine vision system uses reflective near
infrared imaging to evaluate date quality by
analyzing two-dimensional images. This paper
presents the development and test results of a
machine vision system for automatic date quality
evaluation for commercial production. Near
infrared imaging, vision algorithms, and a variety
of operational details of the system, including
cameras, optics,illumination, electronics,
control, and fruit carrier are presented.
The complete machine vision system has been built,
field tested, and installed in a date packing
facility. Relative to manual grading, the
operational system results in improved grading
accuracy and a substantial reduction in operating
costs.
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Project Sponsors:
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Datepac, LLC, Yuma, Arizona
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Collaborators:
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Dr.
Dong Zhang, Sun Yat-Sen University, Guangzhou, China
Dr. Guangming Xiong, Beijing Institute
of Technology, Beijing, China
Mr. Robert Lane, Virginia Tech
Mr. Robert Schoenberger, Agris-Schoen Vision
Systems, Inc. |
Graduate Students:
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Publications:
- D.
Zhang, D.J. Lee, and A. Desai, “Using Short-wave
Infrared Imaging for Fruit Quality Evaluation,"
SPIE Electronic Imaging, Intelligent Robots and
Computer Vision XXX: Algorithms and Techniques,
vol. 9025-10, San Francisco, CA, USA, February
2-6, 2014.
- D.J.
Lee, G.M. Xiong, R.M. Lane, and D. Zhang, “An
Efficient Shape Analysis Method for Shrimp
Quality Evaluation,” IEEE International
Conference on Control, Automation, Robotics and
Vision (ICARCV), p. 865-870, Guangzhou, China,
December 5-7, 2012.
- R.M.
Lane, D.J. Lee, and D. Zhang, “Separating and
Sorting Shrimp for Market Grades, Quality and
Uniformity with Machine Vision”, Seafood Science
Technology 36th Annual Conference and
Trans-Atlantic Fisheries Technology Conference,
Clearwater Beach, FL, USA, October 30-November
2, 2012.
- D.J.
Lee, R.B. Schoenberger, J.K. Archibald, and S.P.
McCollum, “Development of a Machine Vision
System for Automatic Date Grading Using Digital
Reflective Near-Infrared Imaging,” Journal of
Food Engineering, vol. 86/3, p. 388-398, June
2008.
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