Sub-pixel accuracy thickness calculation of poultry fillets from scattered laser profiles

Hansong Jing; Xin Chen; Yang Tao; Bin Zhu; Fenghua Jin

doi:10.1117/12.631028

7 November 2005 Sub-pixel accuracy thickness calculation of poultry fillets from scattered laser profiles

Hansong Jing, Xin Chen, Yang Tao, Bin Zhu, Fenghua Jin

Proceedings Volume 6000, Two- and Three-Dimensional Methods for Inspection and Metrology III; 60000K (2005) https://doi.org/10.1117/12.631028
Event: Optics East 2005, 2005, Boston, MA, United States

Abstract

A laser range imaging system based on the triangulation method was designed and implemented for online high-resolution thickness calculation of poultry fillets. A laser pattern was projected onto the surface of the chicken fillet for calculation of the thickness of the meat. Because chicken fillets are relatively loosely-structured material, a laser light easily penetrates the meat, and scattering occurs both at and under the surface. When laser light is scattered under the surface it is reflected back and further blurs the laser line sharpness. To accurately calculate the thickness of the object, the light transportation has to be considered. In the system, the Bidirectional Reflectance Distribution Function (BSSRDF) was used to model the light transportation and the light pattern reflected into the cameras. BSSRDF gives the reflectance of a target as a function of illumination geometry and viewing geometry. Based on this function, an empirical method has been developed and it has been proven that this method can be used to accurately calculate the thickness of the object from a scattered laser profile. The laser range system is designed as a sub-system that complements the X-ray bone inspection system for non-invasive detection of hazardous materials in boneless poultry meat with irregular thickness.

Citation Download Citation

Hansong Jing, Xin Chen, Yang Tao, Bin Zhu, and Fenghua Jin "Sub-pixel accuracy thickness calculation of poultry fillets from scattered laser profiles", Proc. SPIE 6000, Two- and Three-Dimensional Methods for Inspection and Metrology III, 60000K (7 November 2005); https://doi.org/10.1117/12.631028

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KEYWORDS

Light scattering

Laser scattering

Scattering

Reflection

Coating

Cameras

Imaging systems

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