Earticle

초록

영어

Transmission of block-coded images over wireless channels results in lost blocks. These losses may occur in region-of-interest (ROI) of images which contain important information of images. In this paper, we propose a new error concealment method for covering up the high packet losses of an original image after its transmission through an error-prone channel. In this scheme, Discrete Wavelet Transform (DWT) is applied to each block of the original image in order to produce a lower resolution copy of the block. Then, we choose approximation coefficients of each block as replica of the block and embed it into a remote block (called masking block) of the image in the spatial domain. We use a new algorithm to find the masking block for embedding the replica. The advantage of this algorithm is that it avoids losing simultaneously the information of the block and its masking block. It is shown that the proposed scheme provides significant improvement over existing algorithms in terms of both subjective and objective evaluations. This technique can be implemented for wireless channels to combat degradations in a backward-compatible scheme. It is also shown that this scheme can efficiently restore the lost blocks in the ROI of images.

목차

Abstract
 1. Introduction
 2. The Proposed Algorithm
  2.1. Watermark Generation and Embedding
  2.2. Watermark Extraction and Error Concealment
 3. Capability of Restoring Lost Blocks in ROI
 4. Simulation Results and Discussion
  4.1. The Order of DWT and Scaling Coefficient Effect
  4.2. Performance Evaluation using Various Block Loss Patterns
  4.3. Comparison with Related Works
  4.4. Performance Evaluation in the ROI
 5. Conclusion
 References

키워드

저자

• Razieh Keshavarzian [ Department of Electrical Engineering, Heris Branch, Islamic Azad University, Heris, Iran ]
• Ali Aghagolzadeh [ Faculty of Electrical and Computer Engineering, Babol University of Technology, Babol, Iran ]

참고문헌

발행기관

간행물

표지보기 관심저널 등록

• 간행물명

  International Journal of Advanced Science and Technology

• 간기

  월간

• pISSN

  2005-4238

• 수록기간

  2008~2016

• 십진분류

  KDC 505 DDC 605