Evaluation method of road surface property, and evaluation device of road surface property

• US 10,578,430 B2
• Filed: 02/03/2017
• Issued: 03/03/2020
• Est. Priority Date: 02/04/2016
• Status: Active Grant

• Current Assignee: Topcon Corporation
• Original Assignee: Topcon Corporation
• Inventors: Sasaki, You, Ogawa, Kazuhiro, Ito, Tadayuki
• Primary Examiner(s): Park, Hyun D
• Application Number:
  US15/423,746
• Publication Number:
  US 20170307369A1
• Time in Patent Office: 1,124 Days
• CPC Class Codes: G01B 11/306 for measuring evenness
• CPC Class Codes: G01N 21/8851 Scan or image signal processing specially adapted therefor, e.g. for scan signal adjustment, for detecting different kinds of defects, for compensating for structures, markings, edges G01N21/8806 and G01N21/93 - G01N21/95692 take precedence; optical measurement of dimensions G01B11/00; optical scanning G02B26/10; image transformation G06T3/00; computerised image enhancement G06T5/00; image processing per se for flaw detection G06T7/0002
• CPC Class Codes: G01N 2201/12 Circuits of general importance; Signal processing
• CPC Class Codes: G06F 7/552 Powers or roots , e.g. Pythagorean sums
• CPC Class Codes: H04N 7/183 for receiving images from a single remote source

Abstract

To carry out evaluation of a road surface property easily and in a short period of time without being costly. Measurement data of a road surface measured for a predetermined road width along a path of a road to be measured is acquired; a unit area having a preset length dimension along the path in the road width is set along the path; a model plane in the unit area is set based on the measurement data at each point in the unit area; point group data is generated from a spaced amount of the model plane and each point in the unit area, visualize and display the spaced amount in the path, and display a result of evaluation obtained through statistical processing with the path shown on a map.

Claims

1. An evaluation method of a road surface property comprising the steps of:

scanning a road surface to obtain measurement data based on reflected scan light;

acquiring the measurement data on a spaced amount from a measurement reference plane of each point of the road surface measured for a predetermined road width along a path of a road to be measured;

setting a unit area having a preset length dimension along the path in the predetermined road width along the path;

setting a model plane in the unit area based on the measurement data at each point in the unit area;

generating point group data on a spaced amount of each point from the model plane in the unit area including;

dividing the unit area into a plurality of sections and calculating a first Root Mean Square (RMS) statistic of the point group data in each section thereby obtaining a representative value representing each unit area as an evaluation value;

extracting a section having in which a second RMS statistic satisfies a predefined reference value; and

assuming a section selected based on a changing amount of the second RMS statistic of the extracted section and a third RMS statistic associated with a section adjacent to the extracted section as a deformed area candidate; and

evaluating the road surface property using the point group data generated and identifying at least one recess candidate associated with the road.

2. The evaluation method of the road surface property according to claim 1, further comprising a step of visualizing the point group data in the path.

3. The evaluation method of the road surface property according to claim 2, further comprising a step of statistically processing the point group data for every unit area, for the evaluating the road surface property.

4. The evaluation method of the road surface property according to claim 3, further comprising a step of displaying a result of evaluation obtained through statistical processing with the path shown on a map.

5. The evaluation method of the road surface property according to claim 1, wherein the model plane is calculated with a plurality of regions spaced apart in a direction of the predetermined road width in the unit area as a reference.

6. An evaluation device of a road surface property comprising:

a scanner that obtains measurement data of a road surface based on reflected scan light;

a unit area setting means that acquires the measurement data on a spaced amount from a measurement reference plane of each point of the road surface measured for a predetermined road width along a path of a road to be measured, sets a unit area having a preset length dimension along the path in the predetermined road width along the path;

a model plane setting means that sets a model plane in the unit area based on the measurement data at each point in the unit area;

a point group data generating means that generates point group data on a spaced amount of each point from the model plane in the unit area including;

dividing the unit area into a plurality of sections and calculating a first Root Mean Square (RMS) statistic of the point group data in each section thereby obtaining a representative value representing each unit area as an evaluation value;

extracting a section having in which a second RMS statistic satisfies a predefined reference value; and

assuming a section selected based on a changing amount of the second RMS statistic of the extracted section and a third RMS statistic associated with a section adjacent to the extracted section as a deformed area candidate; and

an evaluation map generating means for evaluating the road surface property using the point group data generated and identifying at least one recess candidate associated with the road for use in repairing the road.

7. The evaluation device of the road surface property according to claim 6, further comprising an image generating means for visualizing the point group data in the path.

8. The evaluation device of the road surface property according to claim 7, wherein the evaluation map generating means statistically processes the point group data for every unit area, for the evaluating the road surface property.

9. The evaluation device of the road surface property according to claim 8, further comprising a displaying means that displays a result of evaluation obtained through statistical processing with the path shown on a map.

10. The evaluation device of the road surface property according to claim 6, wherein the model plane is calculated with a plurality of regions spaced apart in a direction of the predetermined road width in the unit area as a reference.