Fast DCT-Based Spatial Domain Interpolation of Block
Dong Wang · Microcomputer Development · 2003
An efficient method is presented to restore a block in an image, using a reduced set of border pixels. The basic assumption is that, if the set of pixels consisting of the missing block and its boder pixels is transformed by the DCT, the high frequency coefficients obtained can be set to zero. A systen of linear equation results, whose solution yields approximations for the values of the lost pixels. In this interpolation scheme, only eight border pixels are used in the compulation of any missing pixel.