Abstract: A method for decoding an image based on an intra prediction, comprising: obtaining a first prediction pixel of a first region in a current block by using a neighboring pixel adjacent to the current block; obtaining a second prediction pixel of a second region in the current block by using the first prediction pixel of the first region; and decoding the current block based on the first and the second prediction pixels.

Abstract: Disclosed is a system for providing a manual. The system includes a memory device storing the manual, a port into which the memory device is inserted, and an electronic device provided with a display unit that displays the manual if the portable memory device is connected with the port. According to the system, manuals of various electronic devices are stored in a portable memory device, and the manuals are displayed on the electronic devices after the portable memory device is connected with the electronic devices whenever the manuals are necessary, so that users may more easily locate and refer to the manuals.