Modified edge-directed interpolation for images

We present a modification of the new edge-directed interpolation method that eliminates the prediction error accumulation problem by adopting a modified training window structure, and extending the covariance matching into multiple directions to suppress the covariance mismatch problem. Simulation results show that the proposed method achieves remarkable subjective performance in preserving the edge smoothness and sharpness among other methods in the literature. It also demonstrates consistent objective performance among a variety of images. (C) 2010 SPIE and IS&T. [DOI: 10.1117/1.3358372]