In this paper, we proposed an intra 16×16 line-by-line (LbL) prediction. First, we find suitable quantization parameters (QP) for the high resolution videos without the significant subjective quality degradation. Then, we show that closer reference pixels give better prediction through the experiment. Using this observation, we propose an improved intra prediction method. In the proposed method, the line-based prediction is performed instead of the block-based prediction used in the current H.264/AVC. Experimental results show that the proposed algorithm reduces approximately 6.07% bit-rate compared to the H.264/AVC.