Isodensitometry As An Aid To Film Evaluation

Peter N. Street

doi:10.1117/12.946795

1 April 1969 Isodensitometry As An Aid To Film Evaluation

Peter N. Street

Proceedings Volume 0016, Image Information Recovery; (1969) https://doi.org/10.1117/12.946795
Event: Image Information Recovery, 1968, Philadelphia, United States

Abstract

Isodensitometry is a technique whereby the optical densities of a photographic image are grouped into discrete levels and presented as a permanent record of equidensity contours resembling the relief portrayal of a topographical map. The Method is useful in the analysis of photographically stored information for two reasons. First, it permits the retrieval and use of the photometric information content of a photograph, i.e., surface bright-ness, radiation dose, x-ray transmission, etc., of objects under study. Secondly, it assists in the retrieval of low contrast image structure. Typically, this type of imagery is encountered in industrial and medical x-rays, and shadow areas of aerial reconnais-sance photography.

Citation Download Citation

Peter N. Street "Isodensitometry As An Aid To Film Evaluation", Proc. SPIE 0016, Image Information Recovery, (1 April 1969); https://doi.org/10.1117/12.946795

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