Difference recognition method and difference recognition system

1 . A difference recognition method for recognizing a difference, which indicates progress of a construction site, the difference recognition method comprising:

a first state acquiring step of acquiring first captured-image data captured in a first state at a first time point;

a second state acquiring step of acquiring second captured-image data captured in a second state at a second time point subsequent to the first time point;

a first difference recognition step of recognizing a first difference corresponding to a change from the first state to the second state based on the first captured-image data and the second captured-image data using a trained machine-learning model that outputs labels indicating newly installed building elements or removed building elements;

a middle state acquiring step of acquiring middle captured-image data captured in a middle state at a middle time point between the first time point and the second time point;

a second difference recognition step of recognizing a second difference corresponding to a change from the first state to the middle state based on the first captured-image data and the middle captured-image data; and

a work determination step of determining a first work corresponding to a process from the first time point to the middle time point based on the first difference and the second difference.

2 . The difference recognition method according to claim 1 , wherein the difference recognition step includes acquiring a change in recognition possibility of the difference when exchanging a chronological relationship of the first captured-image data and the second captured-image data, and recognizing a rework as the difference in accordance with the change in the recognition possibility.

3 . The difference recognition method according to claim 1 , wherein the difference recognition step includes recognizing a rework as the difference when an element included in the first captured-image data is determined as having been removed in the second captured-image data.

4 . The difference recognition method according to claim 1 , wherein the difference recognition step includes recognizing the rework by comparing a change in work from the first captured-image data to the second captured image data with a chronological order of works prepared in advance.

5 . The difference recognition method according to claim 1 , wherein the difference recognition step includes using a model that learns the difference so as to recognize the difference.

6 . The difference recognition method according to claim 5 , wherein the difference recognition step includes extracting a portion changed between the first-captured image data and the second captured-image data and then using the model to recognize the difference.

7 . The difference recognition method according to claim 5 , wherein the learning of the model includes assigning a label indicating the difference.

8 . The difference recognition method according to claim 5 , wherein the learning of the model includes generating captured-image data distinguishing a region indicating the difference.

9 . The difference recognition method according to claim 1 , wherein the difference recognition step includes categorizing the difference.

10 . The difference recognition method according to claim 1 , wherein the work determination step comprises:

specifying a second work corresponding to the second difference; and

determining the first work based on the second work and the first difference.

11 . A difference recognition system for recognizing a difference, which indicates progress of a construction site, the difference recognition system comprising:

a data management unit that acquires first captured-image data captured in a first state at a first time point, second captured-image data captured in a second state at a second time point that is subsequent to the first time point, and middle captured-image data captured in a middle state at a middle time point between the first time point and the second time point;

a difference recognition unit that recognizes a first difference and a second difference, the first difference corresponding to a change from the first state to the second state based on the first captured-image data and the second captured-image data using a trained machine-learning model that outputs labels indicating newly installed building elements or removed building elements, and the second difference corresponding to a change from the first state to the middle state based on the first captured-image data and the middle captured-image data; and

a work determination unit that determines a first work corresponding to a process from the first time point to the middle time point based on the first difference and the second difference.

12 . The difference recognition system according to claim 11 , wherein the work determination unit is further configured to:

specify a second work corresponding to the second difference; and

determine the first work based on the second work and the first difference.

13 . A difference recognition method for recognizing a difference, which indicates progress of a construction site, the difference recognition method comprising:

a first state acquiring step of acquiring first captured-image data captured in a first state at a first time point;

a second state acquiring step of acquiring second captured-image data captured in a second state at a second time point subsequent to the first time point;

a first difference recognition step of recognizing a first difference corresponding to a change from the first state to the second state based on the first captured-image data and the second captured-image data using a trained machine-learning model that outputs labels indicating newly installed building elements or removed building elements;

a third state acquiring step of acquiring third captured-image data captured in a third state at a third time point subsequent to the first time point and the second time point;

a second difference recognition step of recognizing a second difference corresponding to a change from the second state to the third state based on the second captured-image data and the third captured-image data; and

a work determination step of determining a first work corresponding to a process from the first time point to the second time point based on the first difference and the second difference.

14 . The difference recognition method according to claim 13 , wherein the work determination step comprises:

specifying a second work corresponding to the first difference; and

determining the first work based on the second work and the second difference.

15 . A difference recognition system for recognizing a difference, which indicates progress of a construction site, the difference recognition system comprising:

a data management unit that acquires first captured-image data captured in a first state at a first time point, second captured-image data captured in a second state at a second time point that is subsequent to the first time point, and third captured-image data captured in a third state at a third time point subsequent to the first time point and the second time point;

a difference recognition unit that recognizes a first difference and a second difference, the first difference corresponding to a change from the first state to the second state based on the first captured-image data and the second captured-image data using a trained machine-learning model that outputs labels indicating newly installed building elements or removed building elements, and the second difference corresponding to a change from the second state to the third state based on the second captured-image data and the third captured-image data; and

a work determination unit that determines a first work corresponding to a process from the first time point to the second time point based on the first difference and the second difference.

16 . The difference recognition system according to claim 15 , wherein the work determination unit is further configured to:

specify a second work corresponding to the first difference; and

determine the first work based on the second work and the second difference.