US 12,235,359 B2
Distance measurement device, distance measurement method, and distance measurement program
Tomonori Masuda, Saitama (JP); and Hiroshi Tamayama, Saitama (JP)
Assigned to FUJIFILM CORPORATION, Tokyo (JP)
Filed by FUJIFILM CORPORATION, Tokyo (JP)
Filed on Apr. 5, 2023, as Appl. No. 18/295,983.
Application 18/295,983 is a continuation of application No. 17/465,132, filed on Sep. 2, 2021, granted, now 11,650,315.
Application 17/465,132 is a continuation of application No. 16/817,897, filed on Mar. 13, 2020, granted, now 11,137,496, issued on Oct. 5, 2021.
Application 16/817,897 is a continuation of application No. 15/333,146, filed on Oct. 24, 2016, granted, now 10,627,513, issued on Apr. 1, 2020.
Application 15/333,146 is a continuation of application No. PCT/JP2015/056876, filed on Mar. 9, 2015.
Claims priority of application No. 2014-095557 (JP), filed on May 2, 2014; and application No. 2014-159803 (JP), filed on Aug. 5, 2014.
Prior Publication US 2023/0251377 A1, Aug. 10, 2023
This patent is subject to a terminal disclaimer.
Int. Cl. G01S 17/08 (2006.01); G01C 3/06 (2006.01); G01S 7/484 (2006.01); G01S 7/487 (2006.01); G01S 17/10 (2020.01); G01S 17/88 (2006.01); G02B 7/40 (2021.01); H04N 23/63 (2023.01); H04N 23/67 (2023.01); H04N 23/73 (2023.01); H04N 23/75 (2023.01)
CPC G01S 17/08 (2013.01) [G01C 3/06 (2013.01); G01S 7/484 (2013.01); G01S 7/4876 (2013.01); G01S 17/10 (2013.01); G01S 17/88 (2013.01); G02B 7/40 (2013.01); H04N 23/633 (2023.01); H04N 23/673 (2023.01); H04N 23/73 (2023.01); H04N 23/75 (2023.01)] 23 Claims
OG exemplary drawing
 
1. A measurement device comprising:
an imaging sensor which captures, by performing actual exposure, a subject image of a subject;
an imaging optical system which forms the subject image;
a light emitter which emits directional light along an optical axis direction of the imaging optical system;
a light receiver, which is different from the image sensor, and which receives reflected light of the directional light from the subject, the light receiver deriving a distance to the subject based on a timing at which the directional light is emitted by the light emitter and a timing at which the reflected light is received by the light receiver;
a processor configured to perform a distance measurement operation by the light emitter and the light receiver and an imaging operation by the image sensor;
a derivation circuit performing the distance measurement operation; and
a display,
wherein in a case in which an erroneous measurement, in which an elapsed time from a light emission to a light reception of the directional light exceeds a predetermined time, or the directional light is not returned to be received by the light receiver, occurs predetermined times, the processor indicates an error on the display;
wherein the derivation circuit performs the derivation of the distance to the subject one or more times so as to derive a final distance; and
wherein, in a case of deriving the final distance, the derivation circuit determines a distance range for use or a time range from the emission of the directional light to the reception of the directional light based on focusing state specification information of the measurement device and derives the final distance within the determined distance range or the determined time range.