Abstract: A multi-projector system and a method of calibrating the multi-projector system are provided. The method includes: controlling a first projector to project a first image, and capturing and generating a first captured image including the first image to obtain a first color value from the first captured image through an image capturing device; projecting a second image according to a first projection parameter, and capturing and generating a second captured image including the second image to obtain a second color value from the second captured image through the image capturing device, wherein the first projection parameter includes an electrical parameter of a light source module of the second projector; calculating an absolute difference between the first color value and the second color value; and adjusting the first projection parameter to update the absolute difference in response to the absolute difference being greater than a first threshold.

Abstract: A multimedia digital video recorder and player capable of recording/playing audio and video while detecting a place is disclosed comprising a display on the outside wall for audio and video output, a digital video recorder and player module, which comprises a memory unit for storing data, a control interface for the connection of an external control device for system operation control, a signal processing unit for receiving and processing/editing signals obtained from video cameras connected thereto for display on the display and storage in the memory unit, an external signal interface for input of external audio/video signals from external signal storage devices, a multimedia player module, which comprises an audio/video decoder for editing audio and video signals received from the external signal sources and outputting edited audio and video signals to the display through an audio/video interface thereof for play.