Motion Compensated Interpolation

Elena Marcozzi; Stefano Tubaro

doi:10.1117/12.941297

14 October 1987 Motion Compensated Interpolation

Elena Marcozzi, Stefano Tubaro

Proceedings Volume 0804, Advances in Image Processing; (1987) https://doi.org/10.1117/12.941297
Event: Fourth International Symposium on Optical and Optoelectronic Applied Sciences and Engineering, 1987, The Hague, Netherlands

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.

Citation Download Citation

Elena Marcozzi and Stefano Tubaro "Motion Compensated Interpolation", Proc. SPIE 0804, Advances in Image Processing, (14 October 1987); https://doi.org/10.1117/12.941297

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