Dishwasher and control method thereof

A dishwasher, comprising:

• a wash tub to accommodate an object to be washed;
• a spray arm rotatably disposed within the wash tub, the spray arm configured to spray water towards the object and including a plurality of separate spray areas;
• a flow path diverter disposed at the spray arm and configured to selectively open and close a flow of water to the plurality of separate spray areas;
• a first actuator to rotate the spray arm;
• a second actuator to rotate the flow path diverter;
• and
• a camera disposed on the spray arm,
• wherein the plurality of separate spray areas comprise a first spray area, and a second spray area, and
• wherein the second spray area has at least one of an amount of sprayed water and a spray speed greater than that of the first spray area.

A control method of a dishwasher, comprising:

• washing an object by spraying water through a first spray area included in a spray arm;
• determining whether contaminants remain on the object based on an image captured by a camera disposed on the spray arm;
• positioning in a second spray area of the spray arm adjacent the contaminants by operation of a first actuator;
• diverting a flow path of water with a flow path diverter disposed at the spray arm to block a flow of water to the first spray area such that the water flows to the second spray area,
• wherein the flow path diverter is moved by operation of a second actuator;
• and
• washing a portion with the remaining contaminants by spraying water through the second spray area.