Information processing device, information processing method and medium

Patent metadata

Field	Value
Publication number	US-10197502-B2
Application number	US-201515304484-A
Country	US
Kind code	B2
Filing date	Feb 19, 2015
Priority date	Apr 16, 2014
Publication date	Feb 5, 2019
Grant date	Feb 5, 2019

Abstract

For detecting a crack formed on a structure surface without erroneously, an information processing device that detects a crack on a structure, includes a change detection unit that detects a change in positions of at least two measurement points on the structure; and a crack detection unit that detects a crack based on the change in the positions of the measurement points detected by the change detection unit.

First claim

The invention claimed is:

1. An information processing device configured to detect a crack on a structure, comprising:
a memory storing a program; and
a processor configured to execute the program to:
receive image data corresponding to images of the structure acquired at different times;
calculate displacement features of at least two arbitrary regions in the image data, each displacement feature indicating a temporal change in position of an arbitrary region in the image data corresponding to an arbitrary measurement point on the structure;
compare the displacement features for the at least two arbitrary regions to detect at least one of a location or an existence of the crack in the structure;

calculate a displacement distribution, which indicates a distribution of the change in the positions of the at least two arbitrary regions; and
divide the displacement distribution into a plurality of regions based on the proximity of the change in the positions of the at least two arbitrary regions, and detect that the location of the crack is at a boundary between divided regions.

2. The information processing device according to claim 1 , wherein the processor is further configured to execute the program to:
detect that the crack is located between a first measurement point in a first arbitrary region and a second measurement point in a second arbitrary region based on a relation between the displacement features for the first and second arbitrary regions.

3. The information processing device according to claim 2 , wherein the processor is further configured to execute the program to:
detect that there is the crack between the first and second measurement points when the relation between the displacement features satisfies a predetermined condition.

4. The information processing device according to claim 2 , wherein the processor is further configured to execute the program to:
detect that there is the crack between the first and second measurement points based on a relation of the displacement features of the first and second arbitrary regions and a relation of a change in positions of measurement points around the first and second measurement points.

5. The information processing device according to claim 1 , wherein the processor is further configured to execute the program to:
calculate a crack opening displacement, which is a displacement of a crack opening of the detected crack, based on the displacement features.

6. The information processing device according to claim 5 , wherein the processor is further configured to execute the program to:
calculate, as the crack opening displacement, a maximal value of the displacement of the crack opening of the detected crack.

7. The information processing device according to claim 5 , wherein the processor is further configured to execute the program to:
evaluate soundness of the structure based on the calculated crack opening displacement.

8. The information processing device according to claim 7 , wherein the processor is further configured to execute the program to:
store, in the memory, a standard crack opening displacement as a standard of soundness evaluation;
compare the calculated crack opening displacement with the standard crack opening displacement; and
evaluate the soundness of the structure based on the comparison result.

9. The information processing device according to claim 8 , wherein the processor is further configured to execute the program to:
acquire external force applied to the structure having the detected crack;
estimate a crack opening displacement at standard external force, which is a crack opening displacement when external force used as a standard in soundness evaluation is applied, based on the external force acquired at a time of calculation of the crack opening displacement, and the crack opening displacement; and
evaluate the soundness of the structure based on a comparison result of the crack opening displacement at standard external force and the standard crack opening displacement.

10. The information processing device according to claim 5 , wherein the processor is further configured to execute the program to:
acquire additional image data indicating the structure that is a target for checking for cracks; and
calculate the crack width of the detected crack, based on the additional image data in which the calculated crack opening displacement is maximal.

11. The information processing device according to claim 5 , wherein the processor is further configured to execute the program to:
acquire external force applied to the structure having the detected crack; and
calculate a depth of the detected crack, based on the external force acquired at the time of the calculation of the crack opening displacement, and the crack opening displacement.

12. The information processing device according to claim 11 , wherein the processor is further configured to execute the program to:
evaluate the soundness of the structure based on the calculated depth of the crack.

13. The information processing device according to claim 12 , wherein the processor is further configured to execute the program to:
evaluate the soundness of the structure based on a result of comparison of the calculated depth of the crack with a standard crack depth representing a standard of soundness evaluation.

14. The information processing device according to claim 1 , wherein the processor is further configured to execute the program to:
calculate the displacement features before and after a predetermined external force is applied, and
detect the crack based on the displacement features before and after the predetermined external force is applied.

15. The information processing device according to claim 1 , wherein
the displacement features include at least one of a displacement direction and a displacement quantity, and
the processor is further configured to execute the program to detect the existence or location of the crack based on at least one of the displacement direction or the displacement quantity.

16. The information processing device according to claim 1 , wherein the processor is further configured to execute the program to:
divide the displacement distribution into the plurality of regions such that regions in which the change satisfies a predetermined condition are consolidated.

17. An information processing method for detecting a crack on a structure, comprising:
receiving image data corresponding to images of the structure acquired at different times;
calculating displacement features of at least two arbitrary regions in the image data, each displacement feature indicating a temporal change in position of an arbitrary region in the image data corresponding to an arbitrary measurement point on the structure;
comparing the displacement features for the at least two arbitrary regions to detect at least one of a location or an existence of the crack in the structure;
calculating a displacement distribution, which indicates a distribution of the change in the positions of the at least two arbitrary regions; and
dividing the displacement distribution into a plurality of regions based on the proximity of the change in the positions of the at least two arbitrary regions, and detect that the location of the crack is at a boundary between divided regions.

18. A computer readable non-transitory medium storing a program that, when executed by a computer, causes the computer to perform a method, the method comprising:
receiving image data corresponding to images o

Assignees

• Nec Corp

Inventors

• Ohta Masahiko
• Takada Jun
• Imai Hiroshi
• Hatabu Atsushi
• Nakano Gaku
• Wang Zhen
• Senda Yuzo

Classifications

• G01B11/16

  for measuring the deformation in a solid, e.g. optical strain gauge · CPC title

• G01N21/8851 Primary

  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 title

• G01N21/88

  Investigating the presence of flaws or contamination · CPC title

• G01N21/84

  Systems specially adapted for particular applications · CPC title

• G06T2207/30132

  Masonry; Concrete · CPC title