Film digitization using dye density estimates

Details Film digitization using dye density estimates Film digitization using dye density estimates

1996-11-08

1999-07-06

Peeso, Thomas

Data processing: measuring, calibrating, or testing

Measurement system

348650, 25055902, H04N 104

Patent

active

059208317

ABSTRACT:
The present invention discloses a method for film archival based upon digitization of dye densities of the film. In particular, by using the analytical densities of the dyes and the dye concentrations at each pixel, the present invention provides a method for determining the color of the particular pixel where such color value is not influenced by aging of the film substrate or chemical degradation of the color dyes used. If the analytical densities of a film are known, then the concentration of each dye can be estimated by measuring the logarithm of the transmission of the film in as few as three frequency bands. The error involved in this digitization is a function of filter bandwidth and a function of the number of spectral transmission measurements used for the dye concentration estimation. The present invention is directly applicable in the field of film restoration and corresponding methods and devices for film restoration are disclosed.

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patent: 5273632 (1993-12-01), Stockkham et al.
patent: 5509086 (1996-04-01), Edgar et al.
Pringle, LN, McElwain, TP, and Glasgow, BB, Digitization of Film for Archiving Through the Estimation of Dye Densities, Proc. of the IS&T/SPIE Symposium on Electronic Imaging: Science & Technology, Color Hard Copy and Graphic Arts IV, vol. 2413 (Feb. 1995).
Pinney, JE and Voglesong, WF, Analytic Densitometry of Reflection Color Print Materials, Photographic Science and Engineering, vol. 6, No. 6, pp. 367-370(Nov.-Dec. 1962).
Viggiano, J. and Wang, C., A Novel Method for Colorimetric Calibration of Color Digitizing Scanners, Proc. TAGA, 143-160 (1993).
Berns, R. and Shyu, M., Colorimetric Characterization of a Desktop Drum Scanner via Image Modeling, IS&T/SID's 2nd Color Imaging Conference: Color Science, Systems and Applications, pp. 41-44 (1994).
Rodriguez, Michael A., and Stockham, Thomas G., Producing Colorimetric Data from Densitormetric Scans, SPIE vol. 1913, pp. 413-418 (1993).
Bard, Charleston C., et al., Predicting Long-Term Dark Storage Dye Stability Characteristic of Color Photographic Products from Short-Term Tests, Journal of Applied Photographic Engineering, vol. 6, No. 2, pp. 42-45(1980).

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