Crack analysis device, crack analysis method, and crack analysis program

1. A crack analysis device comprising

an image acquisition unit configured to acquire an image of a road surface;

a crack detector configured to detect cracks in which a closed region is formed on the photographed road surface based on the photographed image; and

a display configured to display a detection result of the detected cracks; and

a deterioration degree calculator configured to calculate a degree of deterioration of the road surface in accordance with a range of the road surface on which the cracks are detected,

wherein the crack detector detects the cracks which intersect each other on the road surface to form the closed region,

the display performs display in accordance with the calculated degree of deterioration so that the display is superimposed on the photographed image, and

the deterioration degree calculator divides a range of the road surface into ranges of a wheel passage portion and other portions in a crossing direction of a road and calculates the degree of deterioration in the road surface in accordance with presence of the cracks within each of the divided ranges.

2. The crack analysis device according to claim 1 ,

wherein the deterioration degree calculator counts the number of detected cracks in the divided ranges; and

the deterioration degree calculator configured to make an evaluation on deterioration of the road surface based on the number of each counted cracks in the divided ranges.

3. The crack analysis device according to claim 2 ,

wherein the deterioration degree calculator makes an evaluation on deterioration of the road surface, based on an average calculated from a respective degree of deterioration of each of multiple adjacent areas of the road surface.

4. A crack analysis method comprising:

acquiring a photographed image obtained by photographing a road surface;

detecting cracks in which a closed region is formed on the photographed road surface based on the photographed image; and

displaying a detection result of the detected cracks;

calculating a degree of deterioration of the road surface in accordance with a range of the road surface on which the cracks are detected; and

wherein detecting detects the cracks which intersect each other on the road surface to form the closed region,

performing display in accordance with the calculated degree of deterioration so that the display is superimposed on the photographed image, and

dividing a range of the road surface into ranges of a wheel passage portion and other portions in a crossing direction of a road and calculates the degree of deterioration in the road surface in accordance with presence of the cracks within each of the divided ranges.

5. A non-transitory computer readable storage medium that stores a crack analysis program to be executed by a computer to cause the computer to perform:

a photographed image acquisition process of acquiring a photographed image obtained by photographing a road surface;

a crack detection process of detecting cracks in which a closed region is formed on the photographed road surface based on the photographed image;

a display process of displaying a detection result of the detected cracks; and

a deterioration degree calculation process of calculating a degree of deterioration of the road surface in accordance with a range of the road surface on which the cracks are detected,

wherein the crack detection process of detecting cracks which intersect each other on the road surface to form the closed region,

the display process of performing display in accordance with the calculated degree of deterioration so that the display is superimposed on the photographed image, and

the deterioration degree calculation process of dividing a range of the road surface into ranges of a wheel passage portion and other portions in a crossing direction of a road and calculates the degree of deterioration in the road surface in accordance with presence of the cracks within each of the divided ranges.