A method applied to a camera that includes a visible light sensor, a phase sensor, and a processor. The visible light sensor collects a visible light image of a shooting scene. The phase sensor collects a phase image of the shooting scene. The processor obtains depth information based on the phase image, and superimposes the depth information on the visible light image to obtain a depth image. Optionally, the camera may also include an infrared illuminator that may be turned on when a scene illumination is insufficient to increase an accuracy of the depth information.