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Three-dimensional measurement device and three-dimensional measurement method

a three-dimensional measurement and measurement device technology, applied in the field of three-dimensional measurement devices and three-dimensional measurement methods, can solve the problems of difficult high-speed measurement at short distances, difficult to make a device compact, and difficult to measure distance range, so as to increase the distance range

Inactive Publication Date: 2006-06-15
MINOLTA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention provides a three-dimensional measurement method and device that can measure the distance to multiple positions on an object by projecting light and receiving the reflected light. The method and device have several advantages, including high-resolution, compact form factor, and the ability to input desired precision in the measurement. Additionally, the method and device can increase the distance range of the measurement. The technical effects of the invention include improved accuracy and efficiency in three-dimensional measurement.

Problems solved by technology

It is difficult to make a device compact since a light modulation device must be included in a construction for controlling the exposure timing of the solid state area sensor by light modulation as described above.
In a construction for standardizing the amount of light of the reflected pulse light, disadvantages arise inasmuch as the allowed range of reflectivity of the object and the measurable distance range are limited by the performance of the optical system used for such standardization, such that resolution is determined by the period of the projection.
In the aforesaid conventional constructions, high-speed measurement at short distances is difficult because each uses a method of detection of the length of the time-of-flight based on the amount of exposure light.

Method used

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  • Three-dimensional measurement device and three-dimensional measurement method
  • Three-dimensional measurement device and three-dimensional measurement method

Examples

Experimental program
Comparison scheme
Effect test

first embodiment

Device Structure

[0035] FIGS. 1(a) and 1(b) show the structure of a three-dimensional measure device of the first embodiment. FIG. 1(a) shows the entire structure, and FIG. 1(b) shows the structure of the image sensing surface.

[0036] A three-dimensional measurement device 1 is provided with a light source 11, projection lens 12, light receiving lens 21, and solid state area sensor 22. The light source 11 receives power from a light generating circuit 32, and emits laser light. An object Q is illuminated by the laser light passing through the projection lens 12. The light reflected from the object Q passes through the light receiving lens 21, and impinges the solid state area sensor 22. The solid state area sensor 22 has pixels which block the light from outside the device, and part of the laser light from the light source 11 passes through an internal optical path 15 comprised of optical fiber without passing outside and directly impinges the pixel as “standard light.” Hereinafter...

second embodiment

[0103] Laser light is most suitable as the signal medium in distance measurement using the TOF method. However, since measurement of light propagation time is an event performed at high speed, it is difficult to ensure high accuracy at near-field distances. measurement of constant precision can be realized regardless of whether the distance is near-field or not by using the TOF method and the triangulation method.

Device Construction

[0104]FIG. 18 shows the structure of a three-dimensional measurement device of the second embodiment.

[0105] The three-dimensional measurement device 2 has, in addition to the structural elements of the three-dimensional measurement device 1 shown in FIG. 1, a triangulation density gradient filter 19, filter controller 38, and mode switch 39.

[0106] The function of the density gradient filter 19 is variable, an includes projecting a first light and a second light having different luminous intensity distributions, and a substantially through-like state ...

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Abstract

The purpose of the present invention is to realize a compact three-dimensional measurement device of high resolution. In the present invention, a pulse light is projected on an object, the light reflected from the object is received by a solid state area sensor having a plurality of photoelectric conversion elements, the area sensor is controlled with a timing synchronized with the projection of the pulse light, and the distance to each photoelectric conversion element is measured based on the output of the solid state area sensor.

Description

RELATED APPLICATION [0001] This application is based on Patent Application No. 2000-155768 filed in Japan, the entire content of which is hereby incorporated by reference. BACKGROUND OF THE INVENTION [0002] 1. Field of the Invention [0003] The present invention relates to a three-dimensional measurement method and device for obtaining position information of an object by projecting light and receiving the light reflected from the object. [0004] 2. Description of the Related Art [0005] Three-dimensional measurement can be accomplished using the time of flight (TOF) from the moment of light pulse transmission to the reception of the returning light pulse reflected by an object since this TOF is dependent on distance. [0006] Japanese Laid-Open Patent Application No. H11-508371 discloses a device using a solid state area sensor as a photoreceptor device for modulating light entering the solid state area sensor by a photoelectric modulator. The distance is reflected in the amount of expo...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): G01C3/08G01B11/00G01B11/25G01C3/06G01S7/4863G01S7/4865G01S17/14G01S17/42G01S17/46G01S17/89G06F3/00G06F3/038G06F3/0487G06K9/00
CPCG01B11/25G01S7/4863G01S7/4865G01S7/497G01S17/105G01S17/42G01S17/89G06T7/0057G06T7/521G01S17/14
Inventor KAMON, KOICHINORITA, TOSHIOUCHINO, HIROSHI
Owner MINOLTA CO LTD
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