Adaptive frame interval control and its quality estimation

A frame-rate or frame-interval manipulation is one of the effective techniques utilized in the area of video coding. Although some adaptive frame insertion techniques have been proposed, they often introduce annoying artifact caused by a lack of "motion smoothness". The purpose of this paper is to propose a novel frame insertion technique that generates high subjective quality in the temporal direction. To this end, we first evaluate the relation among "necessity of frame insertion", a motion feature, and the frame rate. Then, a frame insertion algorithm based on the evaluation is proposed. Another advantage lies in the fact that the mean opinion score (MOS) for a sequence generated by our technique can be easily estimated by a very simple equation. We have verified the performance and the advantages of the proposed technique by evaluating the MOS for totally 12 test sequences.