High Quality, Low Complexity Image Scaler Suitable for Rational Factors
Christian Hentschel, Stefan Schiemenz · 2006
2D image resizing is an important issue for pixel oriented displays with variable input formats. With current separable filters including high order polyphase filters, the problem of jagged lines at diagonal edges remains. Another issue is the need of simple but high-quality sealers for a wide range of applications. The novel approach investigated for high-quality resizing by rational factors is based on pixel and line repetition with suitable post-filtering. The resizing method uses simple, non-separable filters, limiting the number of coefficients for up-scaling at any factor to maximal 7 coefficients. Jagged lines can be smoothened perfectly. Realization for up- and down-scaling will be presented including implementation details