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In video coding, an intra (I)-frame is used as an anchor frame for referencing the subsequence frames, as well as error propagation prevention, indexing, and so on. To get better rate-distortion performance, a frame should have the following quality to be an ideal I-frame: the best similarity with the frames in a group of picture (GOP), so that when it is used as a reference frame for a frame in the GOP we need the least bits to achieve the desired image quality, minimize the temporal fluctuation of quality, and also maintain a more consistent bit count per frame. In this paper we use a most common frame of a scene in a video sequence with dynamic background modeling and then encode it to replace the conventional I-frame. The extensive experimental results confirm the superiority of our proposed scheme in comparison with the existing state-of-art methods by significant image quality improvement and computational time reduction.