This paper presents a comparative study of different error concealment (EC) techniques in the context of distributed speech recognition (DSR) that exploits repetition, interpolation or subvector concealment to counteract transmission errors. A number of experiments are conducted and the results demonstrate that repetition is as good as, or even better than, linear interpolation whereas the subv...

In this paper, an original spatial scene level shape error concealment technique for segmented objectbased video scenes, to be used in error-prone environments such as mobile networks, is proposed. This technique is different from existing shape concealment techniques because it considers, not only the video objects that have to be concealed, but also the context in which these objects are inse...

In this paper, we present a new spatial error concealment algorithm with optimized directional decision and extrapolation. First, we employ the Sobel operator and a Hessian matrix to determine the exact direction in the cases of existing both step edges and line edges in the image. Then, with the accurately estimated direction, lost MBs are recovered by directional extrapolation pixel-by-pixel....

This paper presents a concealment method based on forward error correction (FEC) to improve speech quality deterioration caused by packet losses for CELP based coders. We applied our scheme to the standard ITU-T G729 standard speech coder to evaluate the proposed method. The perceptual evaluation of speech quality (PESQ) and enhanced modified bark spectral distortion (EMBSD) tests under various...

We propose a new multiple description method for wavelet transform coded images. The partitioning of the coefficients at the encoder is combined with concealment at the decoder to produce descriptions. An optimal concealment method for wavelet coefficients is derived based on statistical characteristics. Concealment in LL subband is treated differently and is based on its smoothness property. W...

The present cross-sectional study investigated whether psychological flexibility mediates the association between self-concealment and disordered eating (DE) symptoms among non-clinical college students. Data of 209 male and female participants (nfemale =165), aged 18-22 years old, were used for analyses. Self-concealment was found to be positively associated with DE symptoms (i.e., general eat...

INTRODUCTION Publishing protocols of randomized controlled trials (RCT) facilitates a more detailed description of study rational, design, and related ethical and safety issues, which should promote transparency. Little is known about how the practice of publishing protocols developed over time. Therefore, this study describes the worldwide trends in volume and methodological quality of publish...

In this paper we formulate an optimized temporal error concealment approach for H.264 based on the study of the performance of several temporal concealment features that apply to the different steps of the proposed method. Specifically we study how the concealment performance is affected by matching error measures, motion vector candidates and estimation enhancements. We show that the resulting...

When macroblocks are lost in a video decoder such as MPEG-2, the decoder can try to conceal the error by estimating or interpolating the missing area. Many different methods for this type of post-processing concealment have been proposed, operating in the spatial, frequency, or temporal domains, or some hybrid combination of them. In this paper, we show how the use of a decision tree that can a...

The error concealment is a very useful technique for real-time communication systems, such as video conferencing. In this paper, we propose an error concealment technique designated to minimize discontinuities between block boundaries in consideration of the fact that the human visual system is sensitive to discontinuities. Error concealment for each loss block is performed by surrounding regio...