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Proceedings Paper

Motion Compensated Interpolation
Author(s): Elena Marcozzi; Stefano Tubaro
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Paper Abstract

Temporal subsampling of the image sequences is a technique often used to reduce the bit-rate in video codecs. If a 2:1 time subsampling is used, the degradation introduced at the receiver by the repetition of the same frame is acceptable; if the subsampling rate drops to 4:1 or more, the interpolation of the missing frames by either repetition or linear interpolation is absolutely unsatisfactory. It is necessary, therefore, to use more sophisticated interpolation methods, using motion compensation. Using two successively transmitted images (called A and B) we estimate two motion fields. One indicates the displacements of the points of image A going towards image B, and the other the opposite. For this estimation we have used the pel-recursive displacement estimator proposed by Cafforio and Rocca. This algorithm presents a strong interaction between the direction of recursion and the direction of the displacement to be estimated. To minimize these effects four different recursions are utilized and, using an adequate motion selection rule on the four fields, a new motion field is defined, homogeneous and without visible recursion effects. Using these two motion fields a reliable connection between the points of the two images can be created. With this information, missing frames interpolation can be improved.

Paper Details

Date Published: 14 October 1987
PDF: 9 pages
Proc. SPIE 0804, Advances in Image Processing, (14 October 1987); doi: 10.1117/12.941297
Show Author Affiliations
Elena Marcozzi, Central Research Laboratories (Italy)
Stefano Tubaro, Centro Studi Telecomunicazioni Spaziali (Italy)

Published in SPIE Proceedings Vol. 0804:
Advances in Image Processing
Andre J. Oosterlinck; Andrew G. Tescher, Editor(s)

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