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THREE-DIMENSIONAL SHAPE MEASUREMENT METHOD AND THREE-DIMENSIONAL SHAPE MEASUREMENT DEVICE

外国特許コード F120006823
整理番号 S2011-0349
掲載日 2012年8月9日
出願国 世界知的所有権機関(WIPO)
国際出願番号 2012JP051125
国際公開番号 WO 2012/099220
国際出願日 平成24年1月19日(2012.1.19)
国際公開日 平成24年7月26日(2012.7.26)
優先権データ
  • 特願2011-010842 (2011.1.21) JP
発明の名称 (英語) THREE-DIMENSIONAL SHAPE MEASUREMENT METHOD AND THREE-DIMENSIONAL SHAPE MEASUREMENT DEVICE
発明の概要(英語)

A three-dimensional shape measurement method and a three-dimensional shape measurement device in which holography is used, wherein there is achieved a highly accurate three-dimensional measurement of the shape of a moving object. This measurement method comprises: a projection step for projecting an interference pattern (F) having a single spatial frequency (fi) on the surface of an object

a recording step for recording the projected interference pattern (F) as a digital hologram using a light-receiving element

and a measurement step for generating a plurality of reproduced images in which the focal distance has been changed from that of the recorded digital hologram, and deriving the distance to each point on the surface of the object through the application of a focusing method on the interference pattern (F) on each of the reproduced images. The measurement step comprises an interference pattern extraction step for extracting the component of the single spatial frequency (fi) that corresponds to the interference pattern from each of the reproduced images by spatial frequency filtering when the focusing method is applied. The interference pattern extraction step makes it possible to achieve a highly accurate measurement using the focusing method in which the effect of speckles can be reduced and the advantage of free-focus image reproduction using holography can be utilized.

  • 出願人(英語)
  • ※2012年7月以前掲載分については米国以外のすべての指定国
  • HYOGO PREFECTURAL GOVERNMENT,
  • SATO, KUNIHIRO
  • 発明者(英語)
  • SATO, KUNIHIRO
国際特許分類(IPC)

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