An apparatus of encoding an image can include an intra prediction unit that determines an intra prediction mode of a current prediction unit and generates one or more prediction blocks using the intra prediction mode, an inter prediction unit that determines motion information and generates a prediction block using the motion information, a transform unit that transforms residual signals generated using an original block and the prediction block to generate a transformed block, a quantization unit that determines a quantization parameter and quantizes the transformed block using a quantization matrix and the quantization parameter to generate a quantized block, a scanning unit that determines a scan pattern and applies the scan pattern to the quantized block to generate one-dimensional coefficient information, and an entropy coding unit the entropy-codes one-dimensional coefficient information from the scanning unit, intra prediction information from the intra prediction unit, and motion information from the inter prediction unit.