Frequency processing method for radiation images

Details Frequency processing method for radiation images Frequency processing method for radiation images

1992-04-10

1993-12-21

Weinhardt, Robert A.

Boots, shoes, and leggings

36441314, 36441317, 36441319, G06F 1542, G06F 1562

Patent

active

052726266

ABSTRACT:
A radiation image of an object is formed with radiation, which has passed through the object. The radiation image is then photoelectrically read out, and an image signal made up of a series of image signal components representing the radiation image is thereby obtained. Frequency processing is carried out on the image signal in accordance with a predetermined emphasis coefficient .beta.. When the frequency processing is carried out on image signal components corresponding to a peripheral region in the radiation image, which peripheral region has a predetermined width, the value of the emphasis coefficient .beta. used during the frequency processing is decreased monotonously from a value for an image signal component corresponding to a position on the radiation image, which position is closer to the middle part of the radiation image, to a value for an image signal component corresponding to a position on the radiation image, which position is closer to the exterior of the radiation image. The frequency processing is thus carried out such that an artifact occurring at peripheral regions in a reproduced visible image may become imperceptible.

REFERENCES:
patent: 4315318 (1982-02-01), Kato et al.
patent: 4317179 (1982-02-01), Kato et al.
patent: 4747052 (1988-05-01), Hishinuma et al.
patent: 5051902 (1991-09-01), Hishinuma

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