Arbitrarily shaped video objects are an important concept in modern video coding methods. The techniques presently used are not based on image elements but rather video objects having an arbitrary shape. In this paper, spatial shape error concealment techniques to be used for object-based image in error-prone environments are proposed. We consider a geometric shape representation consisting of ...

Nonlinear multichannel filters have successfully been applied to biomedical signals, multichannel images as well as processing of vector fields. In multichannel signals, component variances and correlations among components may be unequal and time-varying. Such changes can be expressed as an affine transformation of the input signal. In this paper, we investigate how the performance and statist...

Reconstruction of normal skulls from deformed skulls is a very important but difficult task in practice. Active shape model (ASM) is among the most popular methods for reconstructing skulls. To apply ASM to skull reconstruction, it is necessary to establish shape correspondence among the training and testing samples because wrong correspondence will introduce unwanted shape variations in ASM re...

The encoding of shape information is a distinguishing feature of MPEG-4. In error prone communication networks, it is important and efficient to conceal shape errors spatially, so as to avoid propagation of errors in the video frames. The proposed system first defines the missing area’s four rectangular neighbors. It then detects in the neighbors the lines that intersect the borders and redefin...

Introduction of Video Objects (VOs) is one of the major contributions of MPEG-4 to the previous MPEG standards. The a-plane of a VO defines its shape and hence determines the boundary of its texture. In error prone communication networks, shape information, as well as texture information is subject to bit error contamination. In this paper, we propose two post-processing shape concealment techn...