Abstract: As the advertisement market of a subway has emerged, a new subway advertisement system for displaying a video in a window of a moving train is suggested. The video quality in such a subway advertisement system is dependent on the accurate and rapid measurement of the speed of the train and achievement of the frame and horizontal pixel synchronization of the video to be represented. A sensor network of a cluster structure is provided that is effective to the subway advertisement system offering based on the network a high-speed/high precision speed measurement and the adaptive synchronization algorithm. Further, the video contents must be often renewed in the subway advertisement system and a speedy data downloading is essential. The tunnel video system suggests a method for improving the data speed through constructing a new structure of a data exclusive network in addition to the sensor network.

Abstract: Disclosed is a method for arranging light emitting diode (LED) modules, a data converting method for displaying a moving picture by using the LED modules and a data converting apparatus therefor. The apparatus includes: a data storage module for storing the moving picture and the image data; and a data conversion module for converting the moving picture into images according to frames, arranging the plurality of LED modules by matching the plurality of LED modules to the image according to each frame, determining locations of the plurality of LED modules, extracting color coordinates of each central point of regions in which the plurality of LED modules have been arranged from the image according to each frame, and generating color coordinates according to the locations as the image data.