Method for the correction of the measurements of optical density

Details Method for the correction of the measurements of optical density Method for the correction of the measurements of optical density

1991-08-22

1994-03-22

McElheny, Jr., Donald E.

Boots, shoes, and leggings

382 6, 382 54, G06F 1542

Patent

active

052970361

ABSTRACT:
To carry out an automatic processing operation on radiographic images in mammography, it is shown that it is possible to correct the harmful effects of the linearity defect of the characteristic curve of sensitivity of the radiographic film used for this radiograph by making a statistical study of the noise in this image. It is shown that this statistical study enables the correction elements to be deduced directly using a top hat transformation. The processing is then independent of any prior knowledge that might be had of the sensitivity of the film or of the conditions in which the examined radiographs were acquired as well as subsequently developed.

REFERENCES:
patent: 3673394 (1972-06-01), Hartmann
patent: 4356398 (1982-10-01), Komaki et al.
patent: 4794531 (1988-01-01), Morishita et al.
patent: 4811090 (1989-03-01), Khurana
patent: 4991092 (1991-02-01), Greensite
patent: 5124913 (1992-06-01), Sezan et al.

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