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:
Nov. 14, 2000
Filed:
Oct. 30, 1997
Hiroshi Nakajima, Tokyo, JP;
Koji Kobayashi, Tokyo, JP;
Yamatake-Honeywell Co., Ltd., , JP;
Abstract
A distance measuring device includes first and second cameras, first and second Fourier pattern data generating sections, a pattern processing section, and a distance measuring section. The two cameras are spaced apart from each other by a predetermined distance. The first Fourier pattern data generating section generates first two-dimensional Fourier pattern data by performing two-dimensional discrete Fourier transform for image data picked up by the first camera as first pattern data. The second Fourier pattern data generating section generates second Fourier two-dimensional pattern data by performing two-dimensional discrete Fourier transform for image data picked up by the second camera as second pattern data. The pattern processing section synthesizes the first and second Fourier two-dimensional pattern data, and performs either two-dimensional discrete Fourier transform or two-dimensional discrete inverse Fourier transform for the synthesized data. The distance measuring section obtains a correlation peak in a range excluding a portion near a reference position in a correlation component area appearing in the synthesized Fourier two-dimensional pattern data, and measures the distance to a target on the basis of the distance from a reference position in the correlation component area to the position of the correlation peak.