MEASUREMENT DEVICE USING CCD CAMERA, AND METHOD FOR SHORTENING RESPONSE TIME THEREOF

WIPO Patent Application WO/2012/137420

A1

Disclosed is a method for shortening a response time of a measurement device (100) controlling an exposure time of a CCD camera in a time of preset control cycle, wherein a camera capable of simultaneously obtaining output of two or more filters with the different transmittances is employed as the CCD camera, the transmittances are set so as to satisfy εND1 > εND2 > … εNDi > εNDi+1 > … > εNDi+n, the transmittances are set so as to lap a saturation value in a measurement range of camera output of a first filter having the high transmittance εNDi detecting a minimum value of the input light amount and a minimum value in a measurement range of camera output of a second filter having the low transmittance εNDi+1, a correction gain of an exposure time obtained by converting to the camera output of the first filter is obtained from the camera output of the second filter or from the ratio of the transmittance εNDi to the transmittance εNDi+1 in a case where the camera output of the first filter is saturated, the input light amount is detected in a previous control cycle, and the exposure time of the camera of the first filter is updated in a next control cycle.

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TAKEMURA SHOTA
NISHIKAWA MASAMITSU

PCT/JP2012/001766

October 11, 2012

March 14, 2012

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TOSHIBA KK (JP)
TAKEMURA SHOTA
NISHIKAWA MASAMITSU

G01B11/24

JPS6412216A	1989-01-17
JPH09126758A	1997-05-16
JP2010223950A	2010-10-07

SAGOI, MASAYUKI (JP)
Masayuki Sunai (JP)

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