Title:
【発明の名称】放射線画像の周波数処理方法
Document Type and Number:
Japanese Patent JP3039879
Kind Code:
B2
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.
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| JPS61124938 | METHOD AND DEVICE FOR READING AND ERASING RADIATION IMAGE INFORMATION |
Inventors:
Nakajima Nobuyoshi
Chikara Kimura
Chikara Kimura
Application Number:
JP8558391A
Publication Date:
May 08, 2000
Filing Date:
April 17, 1991
Export Citation:
Assignee:
Fuji Photo Film Co., Ltd.
International Classes:
G03B42/02; G06T1/00; G06T5/20; G06T5/50; G21K4/00; A61B6/00; H04N7/18; (IPC1-7): G03B42/02; G06F15/62; G06F15/68; G21K4/00
Domestic Patent References:
| JP5611038A | ||||
| JP61115540A | ||||
| JP1238638A |
Attorney, Agent or Firm:
Masafumi Yanagida