Electronic device and method for detecting filter status

An electronic device, comprising:

• a filter;
• an optical sensing element;
• a human-machine interface device;
• and
• a processor coupled to the optical sensing element and the human-machine interface device and configured to:
• start timing and obtain an accumulated operating time in response to activation of the electronic device,
• detect a level of dirtiness of the filter through an optical sensing element in response to the accumulated operating time being greater than or equal to a time threshold value,
• adjust the time threshold value according to the level of dirtiness of the filter, and
• provide a notification related to the filter according to the level of dirtiness of the filter through the human-machine interface device.