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United States Department of Agriculture

Agricultural Research Service

Research Project: SORTING AGRICULTURAL MATERIALS FOR DEFECTS USING IMAGING AND PHYSICAL METHODS Title: Obtaining flat x-ray images from round objects

Author
item Haff, Ronald

Submitted to: ASABE Annual International Meeting
Publication Type: Proceedings
Publication Acceptance Date: April 13, 2007
Publication Date: July 31, 2007
Citation: Haff, R.P. 2007. Obtaining flat x-ray images from round objects. ASABE Annual International Meeting. Vol: pp .

Interpretive Summary: A technique to remove errors in x-ray images of round objects resulting from the geometry of the sample is derived, for both two-dimensional (2D) and linescan imaging. The methods described involve the use of x-ray absorbing materials specifically shaped to equalize the x-ray absorption across the width of the sample, thus correcting the variation in pixel intensity caused by varying sample thickness. In the case of linescan imaging, the attenuator thickness is varied as the sample passes through the plane of the x-rays, either by rotation or linear actuation. For the 2D case, the technique is demonstrated in x-ray images of an apple, an orange, and a lime. For linescan imaging, the correction is applied to a plastic cylinder simulating a container such as a can or a jar.

Technical Abstract: A technique to correct deficiencies in x-ray images of cylindrical or spherical objects that are a consequence of the geometry of the sample is derived, for both two-dimensional (2D) and linescan imaging. The methods described involve the use of attenuators specifically shaped to equalize the x-ray absorption across the width of the sample, thus correcting the variation in pixel intensity caused by varying sample thickness. In the case of linescan imaging, the attenuator thickness is varied as the sample passes through the plane of the x-rays, either by rotation or linear actuation. For the 2D case, the technique is demonstrated in x-ray images of an apple, an orange, and a lime. For linescan imaging, the correction is applied to a plastic cylinder simulating a container such as a can or a jar.

Last Modified: 12/22/2014
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