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United States Department of Agriculture

Agricultural Research Service

Research Project: Quality Based Inspection and Sorting of Specialty Crops Using Imaging and Physical Methods

Location: Healthy Processed Foods Research

Title: Computer vision for foreign body detection and removal in the food industry

Authors
item Toyofuku, Natsuko
item Haff, Ronald

Submitted to: Book Chapter
Publication Type: Book / Chapter
Publication Acceptance Date: June 1, 2011
Publication Date: August 27, 2012
Citation: Toyofuku, N., Haff, R.P. 2012. Computer vision for foreign body detection and removal in the food industry. In: Sun, D. editors. Computer Vision Technology in the Food and Beverage Industries. Philadelphia, PA: Woodhead Publishing. p. 181-205.

Interpretive Summary: Computer vision inspection systems are often used for quality control, product grading, defect detection and other product evaluation issues. This chapter focuses on the use of computer vision inspection systems that detect foreign bodies and remove them from the product stream. Specifically, we will focus on two specific methods: optical inspection and x-ray inspection. Optical inspection uses images or other optical output (such as absorption of light) to sort the food stream for unwanted contaminants. X-ray inspection uses x-ray imaging to non-destructively search the interior of packages and products. Due to the way the x-rays pass through the product, certain foreign contaminants show up more readily under x-ray imaging, such as pits, bones and insects.

Technical Abstract: Computer vision inspection systems are often used for quality control, product grading, defect detection and other product evaluation issues. This chapter focuses on the use of computer vision inspection systems that detect foreign bodies and remove them from the product stream. Specifically, we will focus on these two specific methods: i) Optical inspection relies on the generation of an image or other optical output (such as absorption of light) which is then used to sort the food stream for unwanted contaminants, such as unwanted varieties of grain in wheat processing streams, pits in cherries or unsalable pistachios. The image generation is typically accomplished using visible or near infrared wavelengths. ii) X-ray inspection uses x-ray imaging to non-destructively search the interior of packages and products. Due to the way the x-rays pass through the product, certain foreign contaminants show up more readily under x-ray imaging, such as pits, bones and insects.

Last Modified: 7/24/2014
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