Interpolative BTC image coding
Bing Zeng, Yrjo A. Neuvo, A.N. Venetsanopoulos · 1992
Two interpolative block truncation coding (BTC) schemes with vector quantization (VQ) and median filters as the interpolator are proposed. The first scheme is based on quincunx subsampling and the second one on every-other-row-and-every-other-column subsampling. Compared to the standard BTC, the new schemes yield a significant reduction in bit rate, only a small degradation in quality, and better channel error resisting capabilities. Moreover, the methods are shown to outperform the BTC schemes with pure VQ at the same bit rate and require minimal computations for the interpolation.>