The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 05, 1989
Filed:
Aug. 28, 1986
Takeshi Funahashi, Kanagawa, JP;
Masamitsu Ishida, Kanagawa, JP;
Fuji Photo Film Co., Ltd., Kanagawa, JP;
Abstract
In a radiation image read-out method using a stimulable phosphor sheet, read-out conditions in final read-out are adjusted based on preliminary read-out image information on a region recognized as an irradiation field. To recognize the irradiation field, sample image signals are extracted from preliminary read-out image signals at a picture element string extending from an end towards the center of the stimulable phosphor sheet. Changes between image density levels represented by the sample image signals are expressed by an approximate equation, and differences between imaginary image density levels calculated by the approximate equation and the actual image density levels are calculated. Or, the image density changes are expressed by approximate equations for picture element groups, and differences between imaginary image density levels calculated by the approximate equations in each picture element group are calculated. Or, intersections of lines represented by the approximate equations and an image density change curve higher than a predetermined density level and represented by the sample image signals are detected, and the intersection nearest to the sheet end is recognized as an edge of the irradiation field.