Advanced Hybrid Interpolation Based on Edge Direction Extracted from the DCT Coefficient Distribution

In these days, video technology has successfully improved creating tremendous results. As video technologies improve, multimedia devices and demands from users are diversified. Therefore, the video codec used in these devices should support various displays with different resolutions. The technology to generate a higher resolution image from the associated low-resolution image is interpolation. The interpolations are generally performed in either the spatial domain or the DCT domain. To use the advantages of both domains, we proposed advanced hybrid interpolation algorithm based on edge direction, which adaptively uses interpolation in both domains. The experimental results demonstrate that our algorithm has good performance in terms of PSNR with reducing blocking artifacts.