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:
Jul. 23, 1991
Filed:
Oct. 03, 1989
Sigemi Fujiwara, Ootawara, JP;
Kabushiki Kaisha Toshiba, Kawasaki, JP;
Abstract
In each of two images obtained by a digital radiography system, for example, a mask image and a live image, two regions of interest are set by a cutout position setting section. Images within corresponding regions of interest are subjected to subtraction in a subtraction processing section. By calculating the entropy of one of two subtraction images in an entropy calculating section, amounts of shift to make the entropy local minimum is searched for. By using the amounts of shift to make the entropy local minimum, an amount of rotation is searched for, which makes the entropy of the other subtraction image local minimum. The amounts of shift and rotation are set by a parameter setting section in accordance with the calculated entropy.