Abstract
A new error concealment technique for block-based image coding, like JPEG or MPEG, is described in this paper. We propose a projective interpolation scheme, which is based on the fact that a 2D image object can be well reconstructed by its projection data. In our projective interpolation scheme, the projection data and the interpolation direction are estimated using boundary pixels surrounding a missing block and then the missing block is interpolated by using bilinear reconstruction. Also, the edge pattern of the missing block is examined and utilized with the projective interpolation scheme so as to guarantee the continuity of edge. The proposed algorithm reveals superior subjective quality as well as objective quality to the conventional schemes. The improvement in subjective quality is mainly due to the fact that edges are well preserved and that blocking artifacts are negligible. The proposed algorithm is expected to be useful for the error resilience scheme in any type of block-based image processing and will be applicable to various image coding schemes.
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