Restoration of images transmitted through coherent fiber bundles

Robert Gazerro; Norman P. Katz; Mark R. Nelson

doi:10.1117/12.18881

1 July 1990 Restoration of images transmitted through coherent fiber bundles

Robert Gazerro, Norman P. Katz, Mark R. Nelson

Proceedings Volume 1232, Medical Imaging IV: Image Capture and Display; (1990) https://doi.org/10.1117/12.18881
Event: Medical Imaging '90, 1990, Newport Beach, CA, United States

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.

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Robert Gazerro, Norman P. Katz, and Mark R. Nelson "Restoration of images transmitted through coherent fiber bundles", Proc. SPIE 1232, Medical Imaging IV: Image Capture and Display, (1 July 1990); https://doi.org/10.1117/12.18881

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KEYWORDS

Image processing

Fiber optics

Inspection

Machine vision

Medical imaging

Charge-coupled devices

Moire patterns

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