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Proceedings Paper

Restoration of images transmitted through coherent fiber bundles
Author(s): Robert Gazerro; Norman P. Katz; Mark R. Nelson
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Paper Abstract

The use of coherent fiber-optic bundles as image conduits has increased significantly in recent years. Fiber bundles permit optical inspection of small, previously inaccessible places. Applications in industrial vision, medicine, aerospace instrumentation and other areas are developing rapidly. The resolution of the image transmitted by fiber bundles is primarily limited by the diameter of the individual fibers. The image is further distorted by a number of factors such as the wide and occasionally skewed point spread function of each fiber and the non-uniformity of fiber characteristics throughout the bundle. Additionally, the appearance of the characteristic circular or hexagonal fiber walls is distracting and objectionable to viewers and increases the complexity of machine vision algorithms. We report a sequence of image processing steps on digitized coherent bundle images which results in complete removal of the fiber wall patterns from the transmitted images; along with corrections for factors creating distortion. The processing steps essentially involve 1) calibrating the fiber bundle under uniform illumination, 2) locating the center of each fiber and extracting the centroid value, 3) disseminating the centroid values onto a uniform grid, and 4) reconstructing the complete image by interpolating between nearest neighbor points on the uniform grid. The process has been applied to both monochrome and color images by applying the above steps individually to each of the red, green and blue components. Future work needs to be performed to correct for a visible moire pattern and the inherent smoothing caused by the interpolation process.

Paper Details

Date Published: 1 July 1990
PDF: 6 pages
Proc. SPIE 1232, Medical Imaging IV: Image Capture and Display, (1 July 1990); doi: 10.1117/12.18881
Show Author Affiliations
Robert Gazerro, Imaging Systems Engineering (United States)
Norman P. Katz, Orincon Corp. (United States)
Mark R. Nelson, Data Vector Co. (United States)

Published in SPIE Proceedings Vol. 1232:
Medical Imaging IV: Image Capture and Display
Yongmin Kim, Editor(s)

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