In order to reduce the bit rate of video signals, motion compensation prediction is applied in modern video coding technology. This is a form of temporal redundancy reduction in which the current coding frame is predicted by a motion compensated prediction from some other already decoded frames according to a motion vector. As real motion has arbitrary precision, many video coding standards allow motion vectors to have "sub-pixel" resolution. The 1/4-pel displacement vector resolution is a part of AVS (audio video system). In order to estimate and compensate 1/4-pel displacements, the image signal on sub-pel position has to be generated by interpolation. This paper introduces a new 1/4-pel interpolation method, named as two steps four taps interpolation (TSFT). Compared with the 1/4-pel interpolation method of H.264, 11% spatial complexity is reduced, computation complexity is about the same, and a little more average SNR is gained.
[1]
Thomas Wedi.
Hybrid video coding based on high-resolution displacement vectors
,
2000,
IS&T/SPIE Electronic Imaging.
[2]
J. E. Taber,et al.
Evaluation of digital correction techniques for ERTS images
,
1973
.
[3]
Thomas Martin Deserno,et al.
Survey: interpolation methods in medical image processing
,
1999,
IEEE Transactions on Medical Imaging.
[4]
Hsieh Hou,et al.
Cubic splines for image interpolation and digital filtering
,
1978
.
[5]
R. Keys.
Cubic convolution interpolation for digital image processing
,
1981
.
[6]
Wen Gao,et al.
AVS standard - Audio Video Coding Standard Workgroup of China
,
2005,
14th Annual International Conference on Wireless and Optical Communications, 2005. WOCC 2005.