Apparatus, method, and program for determining abnormality in internal devices

1. An apparatus for determining an abnormality in internal devices, comprising:

an image acquiring unit configured to acquire an image inside a moving body;

a luminance acquiring unit configured to acquire luminance of the image;

a lighting unit configured to illuminate an occupant of the moving body; and

an abnormality determining unit configured to determine, based on the luminance of the image, whether an abnormality is present or absent in the image acquiring unit and the lighting unit,

wherein

the abnormality determining unit determines that the internal devices are normal when the luminance of the image is equal to or greater than a first threshold while the lighting unit receives an instruction to turn light on;

the abnormality determining unit determines that the lighting unit is abnormal when the luminance of the image is equal to or greater than a third threshold and less than a second threshold while the lighting unit receives an instruction to turn light on;

the abnormality determining unit determines that at least the image acquiring unit is abnormal when the luminance of the image is less than the third threshold while the lighting unit receives an instruction to turn light on; and

the second threshold is less than the first threshold and greater than the third threshold.

2. The apparatus of claim 1 , wherein the abnormality determining unit executes an outside light detection mode in which the luminance acquiring unit acquires the luminance of the image, indicating brightness of outside light, while the lighting unit receives an instruction to turn light off and executes an inside detection mode in which the luminance acquiring unit acquires the luminance of the image while the lighting unit receives an instruction to turn light on; and

the abnormality determining unit sets, based on the luminance of the image under the outside light detection mode, the second threshold used in the inside detection mode.

3. The apparatus of claim 2 , wherein the abnormality determining unit sets, based on the luminance of the image under the outside light detection mode, the first threshold used in the inside detection mode.

4. The apparatus of claim 3 , further comprising a speed detection unit configured to detect a speed of the moving body,

wherein the abnormality determining unit executes the outside light detection mode and the inside detection mode when the speed is a predetermined value or less.

5. The apparatus of claim 3 , further comprising a display unit configured to display a given matter about the moving body,

wherein the image acquiring unit is installed at or near the display unit, and

the abnormality determining unit is configured to

execute both the outside light detection mode and the inside detection mode either while the display unit is operated, or while the display unit is not operated.

6. The apparatus of claim 3 , wherein the abnormality determining unit is configured to

determine, immediately after the outside light detection mode, whether or not the luminance of the image is less than the third threshold and

determine that the image acquiring unit is abnormal if the luminance of the image is less than the third threshold and then avoid the inside detection mode.

7. The apparatus of claim 2 , further comprising a speed detection unit configured to detect a speed of the moving body,

wherein the abnormality determining unit executes the outside light detection mode and the inside detection mode when the speed is a predetermined value or less.

8. The apparatus of claim 2 , further comprising a display unit configured to display a given matter about the moving body,

wherein the image acquiring unit is installed at or near the display unit, and

the abnormality determining unit is configured to

execute both the outside light detection mode and the inside detection mode either while the display unit is operated, or while the display unit is not operated.

9. The apparatus of claim 2 , wherein the abnormality determining unit is configured to

determine, immediately after the outside light detection mode, whether or not the luminance of the image is less than the third threshold and

determine that the image acquiring unit is abnormal if the luminance of the image is less than the third threshold and then avoid the inside detection mode.

10. The apparatus of claim 1 , wherein the lighting unit comprises, in the moving body, a first lighting unit configured to illuminate one side of the moving body in a vehicle widthwise direction and a second lighting unit configured to illuminate the other side of the moving body in the vehicle widthwise direction; and

the abnormality determining unit is configured to

execute a first inside detection mode in which the luminance acquiring unit acquires the luminance of the image while the first lighting unit receives an instruction to turn light on and the second lighting unit receives an instruction to turn light off and determine, based on a result of the first inside detection mode, a presence or absence of an abnormality in the first lighting unit, and

execute a second inside detection mode in which the luminance acquiring unit acquires the luminance of the image while the first lighting unit receives an instruction to turn light off and the second lighting unit receives an instruction to turn light on and determine, based on a result of the second inside detection mode, a presence or absence of an abnormality in the second lighting unit.

11. The apparatus of claim 1 , wherein the lighting unit comprises, in the moving body, a first lighting unit configured to illuminate one side of the moving body in a vehicle widthwise direction and a second lighting unit configured to illuminate the other side of the moving body in the vehicle widthwise direction; and

the abnormality determining unit is configured to

execute an inside detection mode in which the luminance acquiring unit acquires the luminance of the image while the first lighting unit and the second lighting unit each receive an instruction to turn light on and

determine a presence or absence of an abnormality in the first lighting unit on a basis of luminance in an area that is within the image obtained under the inside detection mode and is illuminated by the first lighting unit and

determine a presence or absence of an abnormality in the second lighting unit on a basis of luminance in an area that is within the image obtained under the inside detection mode and is illuminated by the second lighting unit.

12. A method for determining an abnormality in internal devices including an image acquiring unit configured to acquire an image inside a moving body, a luminance acquiring unit configured to acquire luminance of the image, and a lighting unit configured to illuminate an occupant of the moving body, the method comprising

an abnormality determining step of determining, based on the luminance of the image, a presence or absence of an abnormality in the image acquiring unit and/or the lighting unit,

wherein

the abnormality determining step determines that the internal devices are normal when the luminance of the image is equal to or greater than a first threshold while the lighting unit receives an instruction to turn light on;

the abnormality determining step determines that the lighting unit is abnormal when the luminance of the image is equal to or greater than a third threshold and less than a second threshold while the lighting unit receives an instruction to turn light on;

the abnormality determining step determines that at least the image acquiring unit is abnormal when the luminance of the image is less than the third threshold while the lighting unit receives an instruction to turn light on; and

the second threshold is less than the first threshold and greater than the third threshold.

13. A non-transitory computer readable recording medium recording a program for executing, in a computer, the method of claim 12 .