In this paper, a new motion compensated frame interpolation method is proposed based on the reliability of
motion vectors determined by the block residual energy. Additional motion re-estimation is applied to those
blocks where unreliable motion vectors are detected. The motion estimation algorithm employed in this work
combines block-based motion estimation with optical flow-based estimation, resulting in a more accurate representation
with only modest computational complexity. The experimental results show that it can improve the
visual quality of the interpolated frames where competing methods fail.
Adaptive warping methods for motion estimation and reconstruction at the receiver side have been considered
recently for low-bit rate video coding. Such approaches are attractive because they are compatible with the
existing MPEG and H.264/AVC standards. This paper follows in that path, introducing an improved method
for low bit rate coding of video in which a forward-backward warping algorithm is employed.
The base algorithm involves an integration of low and high spatial resolution frames where the low resolution
frames are dense in time while the high resolution frames are sparse in time. The forward-backward warping
algorithm presented in this paper improves the robustness of the original warping algorithm. Since conventional
H.264/AVC is based on macroblocks, block artifacts often surface at low bit rates. The proposed approach
tends to eliminate this problem at low bit rates, resulting in improved subjective quality and improved PSNR
performance relative to H.264/AVC.
In this paper, an H.264/AVC video coding strategy is introduced that employs a spatial-temporal video sequence
representation in which video frames are coded at a low spatial sampling rate and reference I frames are coded
at high spatial resolution. High spatial frequency information is re-synthesized at the receiver side using an
adaptive motion estimation and warping method. The approach as presented is shown to improve coding quality
for sequences with low to moderate motion.
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