A Fast Algorithm of 1/4-pel Accuracy Motion Estimati on Basedon SAD Composite Vector[J]. Journal of Image and Graphics, 2005, 10(12): 1591. DOI: 10.11834/jig.2005012292.
H.264 has an enhanced motion estimation method based on block matching that each partition in an inter-coded macroblock is predicted from an area of the same size in a reference picture
the offset between the two areas(the motion vector) has 1/4-pel resolution(for the luma component).Sub-pixel motion compensation can provide significantly better compression performance than integer-pixel compensation
at the expense of increased complexity.Quarter-pixel accuracy outperforms half-pixel accuracy.Motion estimation
whose efficiency has great effect to the whole coding efficiency
is an important part during the video coding process.In this paper
we compare the basic algorithm and some fast algorithms of 1/4-pel accuracy motion estimation
then put forward a fast algorithm which use composite vector.Experiments show that this algorithm is effective.