Transform domain semi-super resolution
This paper presents a transform-based approach to semi-super resolution. The idea of semi-super resolution is to enhance low-resolution frames from a video sequence encoded with different resolutions among frames. The proposed framework uses a DCT-based down-sampling method at the encoder process. At the decoder, DCT-based up-sampling plus high-frequency information from adjacent frames in full resolution are used to enhance interpolated low-resolution frames. The results show an increase of the overall quality without using any extra information from the encoder. The proposed technique can also outperfom previous semi-super resolution methods operating in pixel domain.