Interactive projector and operation method thereof for determining depth information of object

An interactive projector and an operation method thereof for determining depth information of an object are provided. The interactive projector includes an optical engine, an image capture unit and a processing unit. The optical engine projects a visible image via a visible light source and an invisible pattern via an invisible light source to a projection area. The visible light source and the visible are integrated to the optical engine. The image capturing unit captures an image having depth information from the projection area, and the image is projected on an object via the invisible light source. The processing unit is electrically coupled to the optical engine and the image capturing unit. The processing unit receives the image having depth information and determines an interactive event according to the image having depth information. According to the interactive event, a status of the optical engine is refreshed.