Dikbas et al. [6]. In [9], the block size is set to 8×8 and the search range is set to 16 pixels for both horizontal and vertical directions. However, a boundary block can be divided into multiple 4×4 or 2×2 sub-blocks in various-size block interpolation. Full search motion estimation on 8×8 block is applied in [13] with a search range of 50 pixels. In [14], the block size and the search range are set to 8×8 and 16 pixels. [6] performs 8×8 and 4×4 block ME with predictive search. However, it does not provide any information of search range. For fair comparison, search ranges of algorithms [9], [13] and [14] are set to 16 pixels and the predictive search range of the proposed method is 8 pixels. [9] and [14] use the popular adaptive bidirectional overlapped block motion compensation (AOBMC) to obtain the final interpolations; [13] mixes the interpolations using forward and backward unilateral MVFs and performs trilateral filter to reduce errors. [6] uses dense bilateral MVFs to generate two interpolations and mixes them with soft decision. The proposed method employs AOBMC using two MVFs and simply averages them to get the final interpolation. Both the peak signal-to-noise ratio (PSNR) and the structural similarity (SSIM) are used for comparison. In addition, the video quality is assessed subjectively for the artifacts. The results of average PSNR and SSIM comparison is presented in Tables I and II, respectively. Number of frames used in comparison is shown in first column of the table along with the sequence name. The results demonstrate that our proposed algorithm outperforms benchmark methods. [9] uses the bilateral ME in the unknown frame thus gets inferior performance than other methods. [14] performs better than [9] and [13] due to its correct selection between forward and backward MVs. The proposed algorithm achieves an increase in PSNR by 0.80dB compared with [14] and 0.36dB compared with [6]. The SSIM is improved for eight out of eleven sequences, while suffers from a degradation for Forman, Football and Highway