LOCATION MARK DETECTING METHOD FOR ROBOT CLEANER AND ROBOT CLEANER USING THE METHOD

A location mark detecting method of a robot cleaner capable of accurately detecting location marks from an image captured by an upwardly looking camera. The location mark detecting method comprises the steps of obtaining from the image object marks to be compared with the reference location marks, determining whether shapes of the object marks are identical to those of the reference location marks, determining whether a distance separating the object marks is identical to that between the reference location marks if it is determined that the shapes are identical, determining whether a surrounding image of the object marks is identical to that of the reference location marks if it is determined that the distances are identical, and identifying the object marks as the location marks if it is determined that the surrounding images are identical. A robot cleaner capable of wirelessly communicating with an external device comprises a driving unit, an upwardly-looking camera for capturing an image of a ceiling above an area to be cleaned on which location marks are disposed, and a control unit for detecting the location marks from the image captured by the upwardly-looking camera, the control unit commanding the driving unit utilizing information of the current location to perform a work command.