Flush water control method, control device, and non-transitory computer readable recording medium

1. A flush water control method for a controller communicably connected to a flush water controller that controls a flow of flush water into a toilet of a flush type, the flush water control method comprising:

acquiring image data captured by a camera which is located at the toilet to capture an image of a bowl of the toilet;

determining whether an unacceptable matter being an object having a possibility of clogging the toilet is in the bowl by performing image recognition based on the image data; and

sending, to the flush water controller, a flow prohibition signal of prohibiting the flush water from flowing when it is determined that the unacceptable matter is in the bowl.

2. The flush water control method according to claim 1 , further comprising:

acquiring sensing data from a sensor which detects whether a user sits on the toilet;

determining whether a user sits on the toilet by using the sensing data when it is determined that the unacceptable matter is in the bowl; and

sending the flow prohibition signal when it is determined that no user sits on the toilet, and suspending sending of the flow prohibition signal when it is determined that a user sits on the toilet.

3. The flush water control method according to claim 1 , further comprising:

determining whether the unacceptable matter has been removed from the bowl by performing the image recognition based on the image data after sending the flow prohibition signal; and

sending, to the flush water controller, a flow permission signal of permitting the flush water to flow when it is determined that the unacceptable matter has been removed.

4. The flush water control method according to claim 1 , wherein,

in the determining of the unacceptable matter, when the image data contains an image of an object having a predetermined size or larger except for stool and urine, the object is determined as the unacceptable matter.

5. The flush water control method according to claim 1 , wherein,

the image data includes color image data having a plurality of color components, and

in the determining of the unacceptable matter, a difference image between base image data indicating a state of the bowl having no stool, urine, and unacceptable matter, and the image data is calculated, and it is determined, based on luminance of each of the color components of the difference image, whether the image data contains an image of stool and urine.

6. The flush water control method according to claim 1 , wherein

the unacceptable matter includes a diaper.

7. A controller communicably connected to a flush water controller that controls a flow of flush water into a toilet of a flush type, the controller comprising:

an image data acquisition part that acquires image data captured by a camera which is located at the toilet to capture an image of a bowl of the toilet;

an unacceptable matter determination part that determines whether an unacceptable matter being an object having a possibility of clogging the toilet is in the bowl by performing image recognition based on the image data; and

a communication control part that sends, to the flush water controller, a flow prohibition signal of prohibiting the flush water from flowing when the unacceptable matter determination part determines that an unacceptable matter is in the bowl.

8. A non-transitory computer-readable recording medium storing A flush water control program for causing a computer to serve as a controller communicably connected to a flush water controller that controls a flow of flush water into a toilet of a flush type, the flush water control program causing the computer to:

acquire image data captured by a camera which is located at the toilet to capture an image of a bowl of the toilet;

determine whether an unacceptable matter being an object having a possibility of clogging the toilet is in the bowl by performing image recognition based on the image data; and

send, to the flush water controller, a flow prohibition signal of prohibiting the flush water from flowing when it is determined that the unacceptable matter is in the bowl.