Enhancement of image quality by utilization of a priori informat

Details Enhancement of image quality by utilization of a priori informat Enhancement of image quality by utilization of a priori informat

1988-05-16

1990-04-24

Smith, Jerry

Boots, shoes, and leggings

36441314, 378901, G01N 2304, G06F 1542

Patent

active

049204912

ABSTRACT:
The quality of incomplete data Non-Destructive Evaluation and Computed Tomography images is improved by incorporating a priori information into the image reconstruction and image processing to supplement the available data. The a priori information is provided by electronic models of the part derived from a solid modeler, physics of the inspection process, and outputs of touch and other sensors. Methods of improving limited-angle X-ray CT images are given. Calculated projection data in the missing angular range is provided by calculating x-ray path lengths through a solid model of the part, and x-ray attenuation from known physical parameters of the part and source. The measured and calculated projection data are combined to reconstruct the CT image. In an iterative reconstruction approach, precise boundary information from a model and calculated attenuation are information to improve the limited angle image.

REFERENCES:
patent: 4506327 (1985-03-01), Tam
patent: 4618924 (1985-10-01), Hinds
Tam et al., "Limited-angle. . . Transform Iterations", Optical Engineering, vol. 20, No. 4, pp. 586-589; Jul./Aug. 1981.
Tam, "Two dimensional. . . Plan characterization", Journal of Nondestructive Evaluation, vol. 5, No. 2, pp. 95, 106, 1985.
K. C. Tam and V. Perez-Mendez, "Tomographical Imaging with Limited-Angle Input", J. Opt. Soc. Am., 71, May 1981, 582-592.
K. C. Tam and V. Perez-Mendez, "Limits to Image Reconstruction from Restricted Angular Input", IEEE Trans. Nuci. Sci., NS-28, Feb. 1981, 179-181.
K. C. Tam, "The Use of Convex Hulls in Limited-Angle Computerized Tomography", TIS Report No. 88CRD006, Feb. 1988, General Electric Co., Corporate Research and Development, P.O. Box 8, Schenectady, NY 12301.

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