Title:
【発明の名称】空間フィルタを用いた移動距離測定装置
Document Type and Number:
Japanese Patent JP3072675
Kind Code:
B2
Abstract:
PURPOSE:To enhance accuracy by flickering illumination on a pavement (moving face) stroboscopically thereby realizing highly accurate measurement even under high speed movement. CONSTITUTION:A CCD line sensor camera 3 detects reflection light corresponding to light and dark pattern of a pavement. Reflection light signals are sampled at a predetermined period, read out through a read out circuit 4, and then converted through an A/D converter 5. Data signals thereof are then subjected to product-sum operation together with a spatial weighting function fed from a weighting function generator 6 thus obtaining a spatial frequency component vector. A moving distance is then determined based on the differential phase angle between previously detected vector and a currently detected vector. In case of high speed movement, the CCD line sensor 2 detects a reflected light accompanied with variation of light and dark pattern due to movement within a storage time and thereby the moving distance can not be measured accurately. When an illumination light source 8 is flickered stroboscopically, i.e., with a shorter lighting time as compared with the CCD storage time, comps frequency component pattern in the light and dark pattern can be detected stably and accurately.
Inventors:
Toshio Nagao
Masakatsu Nomura
Masakatsu Nomura
Application Number:
JP12240892A
Publication Date:
July 31, 2000
Filing Date:
May 15, 1992
Export Citation:
Assignee:
KABUSHIKI KAISHA MEIDENSHA
International Classes:
G01C22/00; G05D1/02; G01B11/00; (IPC1-7): G01B11/00
Domestic Patent References:
| JP3152468A | ||||
| JP62194415A |
Attorney, Agent or Firm:
Fujiya Shiga (1 person outside)