Förfarande för korrigering av mätningar av optisk täthet på röntgenfilm

摘要

In order to perform automatic processing on radiographic images in mammography it is shown that it is possible to correct the undesirable effects of the linearity defect of the characteristic sensitivity curve of the radiographic film which has been used for this radiography by performing a statistical study of the noise in this image. It is shown that this statistical study (17) makes it possible to directly deduce the correction elements (15). The processing is then independent of any foreknowledge which might be available of the sensitivity of the film or of the conditions in which the exposures studied have been both acquired and then subsequently developed.