High-Resolution Digitization Of Photographic Images With An Area Charge-Coupled Device (Ccd) Imager

James R. Milch

doi:10.1117/12.976209

10 December 1986 High-Resolution Digitization Of Photographic Images With An Area Charge-Coupled Device (Ccd) Imager

James R. Milch

Proceedings Volume 0697, Applications of Digital Image Processing IX; (1986) https://doi.org/10.1117/12.976209
Event: 30th Annual Technical Symposium, 1986, San Diego, United States

Abstract

The quality of a photographically recorded image can be enhanced through digital image processing. It is first necessary, however, to convert the film densities into an accurate digital record, free of additional noise and artifacts. The rate at which photographic negatives can be digitized to provide high-quality input for digital image enhancement is severely limited by current technology, particularly for small formats (8 mm x 10 mm images). At high speeds, the shortcomings of light sources, optics, and detectors, and certain peculiarities of existing photographic negatives, reduce the signal-to-noise ratio of the digital information to an unacceptable extent. A new method for scanning photographic negatives which uses an area CCD imager to provide substantially improved performance is described. The method recognizes the architectural limitations of CCD technology and makes optimal use of the silicon surface area. It also optimizes use of the light provided by simple illumination systems. The optomechanical implementation of the method is very simple, but this simplicity is gained at the expense of electronic complexity. Substantial digital preprocessing is required to reconstruct and correct the recorded image. A breadboard system has been built to demonstrate the method and to determine the design parameters required to produce excellent images. It was found that the method imposes strict requirements on the CCD electronics, but that all systematic artifacts could be removed by suitable processing of the digital image data. High quality images were obtained at the rates required.

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James R. Milch "High-Resolution Digitization Of Photographic Images With An Area Charge-Coupled Device (Ccd) Imager", Proc. SPIE 0697, Applications of Digital Image Processing IX, (10 December 1986); https://doi.org/10.1117/12.976209

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