Non-linear Motion-compensated Interpolation for Low Bit Rate Video

By augmenting the ITU-T H.263 standard bit stream with supplementary motion vectors for to-be-interpolated frames, a new deformable block-based fast motion-compensated frame interpolation (DB-FMCI) scheme is presented. Unlike other motion-compensated interpolation methods, which assume a constant motion velocity between two reference P frames, the proposed scheme takes into account the non-linearity of motion to achieve a better interpolation result. The supplementary motion information for the so-called M frame (motion frame) is de ned, which consists of compressed residues of linear and non-linear motion vectors. The non-linear motion vectors of skipped frames are used at the decoder to determine the 6-parameter a ne-based DB-FMCI. Experimental results show that the proposed non-linear enhancement scheme can achieve a higher PSNR value and better visual quality in comparison with traditional methods based only on the linear motion assumption.