Laundry machine and control method therefor

A method of controlling a washing machine, the method comprising:

• detecting properties of laundry in a drum of the washing machine,
• wherein detecting the properties of the laundry comprises:
• detecting a weight of the laundry,
• capturing an image of an interior of the drum using a single camera,
• detecting a volume of the laundry in the drum using the captured image, and
• calculating a density of the laundry based on the detected volume and the detected weight, and
• wherein the method further comprises:
• comparing the calculated density with a predetermined reference value,
• notifying a user of a change of at least one of a water level of wash water to be supplied to the drum, a rotation speed of the drum, a rotation time period of the drum, or a rotation change cycle of the drum based on whether the calculated density is higher or lower than the predetermined reference value,
• waiting for a user to perform an input operation in response to a notification of the change,
• based on receiving no input or a signal approving of the change while waiting for the user to perform an input operation, performing a washing process according to the change of at least one of the water level of wash water to be supplied to the drum, the rotation speed of the drum, the rotation time period of the drum, or the rotation change cycle of the drum, and
• based on receiving a signal disapproving of the change while waiting for the user to perform an input operation, performing a washing process according to at least one of a water level of wash water to be supplied to the drum, a rotation speed of the drum, a rotation time period of the drum, or a rotation change cycle of the drum that corresponds to the predetermined reference value.