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Applied Optics

Applied Optics


  • Vol. 40, Iss. 8 — Mar. 10, 2001
  • pp: 1195–1200

Multiresolution local contrast enhancement of x-ray images for poultry meat inspection

Zikuan Chen, Yang Tao, and Xin Chen  »View Author Affiliations

Applied Optics, Vol. 40, Issue 8, pp. 1195-1200 (2001)

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A multiresolution-analysis-based local contrast transform is proposed to enhance local structures in x-ray images. The local contrast is defined as a ratio of the local intensity variation to the local mean. With wavelet multiresolution decomposition, the detail coefficients and approximation coefficients are interpreted, respectively, as local variations and local averages in virtue of the localization property of wavelet transform. Based on the local contrast transform, an algorithm is developed to modify coefficients before wavelet synthesis. An across-scale local contrast is obtained when the scale associated with the local variation is different from that of the local mean. The nonlinearity and local adaptiveness properties of local contrast transform result in structural enhancement in local dark regions in the reconstructed images. We applied this technique to deboned poultry inspection using x-ray images. Because of its high x-ray absorption, a foreign inclusion appears as a low-intensity object in an x-ray image, thus resulting in contrast enhancement in the reconstructed multiresolution images.

© 2001 Optical Society of America

OCIS Codes
(100.2980) Image processing : Image enhancement
(100.7410) Image processing : Wavelets
(150.3040) Machine vision : Industrial inspection
(170.7440) Medical optics and biotechnology : X-ray imaging

Original Manuscript: May 24, 2000
Revised Manuscript: November 13, 2000
Published: March 10, 2001

Zikuan Chen, Yang Tao, and Xin Chen, "Multiresolution local contrast enhancement of x-ray images for poultry meat inspection," Appl. Opt. 40, 1195-1200 (2001)

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