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:
May. 23, 2000
Filed:
Oct. 28, 1997
Hiroshi Nakajima, Tokyo, JP;
Koji Kobayashi, Tokyo, JP;
Yamatake-Honeywell Co., Ltd., , JP;
Abstract
A moving direction measuring device includes a collation Fourier pattern data generating section, a registration Fourier pattern data generating section, a pattern processing section, and a moving direction measuring section. The collation Fourier pattern data generating section generates collation Fourier two-dimensional pattern data by performing two-dimensional discrete Fourier transform for two-dimensional pattern data input at time T.sub.n. The registration Fourier pattern data generating section generates registration Fourier two-dimensional pattern data by performing two-dimensional discrete Fourier transform for two-dimensional pattern data input at time T.sub.n+1. The pattern processing section synthesizes these Fourier two-dimensional pattern data, and performs either two-dimensional discrete Fourier transform or two-dimensional discrete inverse Fourier transform for the resultant data. The moving direction measuring section obtains a correlation peak in a correlation component area appearing in the synthesized Fourier two-dimensional pattern data having undergone Fourier transform performed by the pattern processing section, and obtains a direction from a reference position in the correlation component area to a position of the correlation peak as a moving direction of the device.