| Min Wang,Bin Tan,Dongmei Zhu,Qin Zou.[J].重庆邮电大学新办英文刊,2020,(4):471-479 |
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| DVCast: denoising and variable dct for analog visual communications |
| Received: June 11, 2019 Revised: September 21, 2019 |
| DOI：https://doi.org/10.1016/j.dcan.2019.10.008 |
| 中文关键词: |
| 英文关键词: Analog visual communications;Image de-noising;DCT;Graphics processing units |
| 基金项目: |
| Author | Institution | E-mail | | Min Wang | The School of Mathematics and Computer Science, Gannan Normal University, Ganzhou, 341000, China;Key Laboratory of Jiangxi Province for Numerical Simulation and Emulation Techniques, Ganzhou, 341000, China | wangmin@gnnu.edu.cn | | Bin Tan | College of Electronics and Information Engineering, Jinggangshan University, Ji’an, 343009, China | tanbin@jgsu.edu.cn | | Dongmei Zhu | The School of Mathematics and Computer Science, Gannan Normal University, Ganzhou, 341000, China | zhudongmei1021@gmail.com | | Qin Zou | The School of Mathematics and Computer Science, Gannan Normal University, Ganzhou, 341000, China | zouqin@gnnu.edu.cn |
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| 中文摘要: |
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| 英文摘要: |
| Recently, analog visual transmission has attracted considerable attention owing to its graceful performance degradation for various wireless channels. In this study, we propose a novel analog visual communications system, named DVCast,in which an image denoising algorithm is used to fully utilize spatial correlation;moreover,the variable block size Discrete Cosine Transform (DCT) is used to preserve more correlation information in an image. Obviously, there is a tradeoff between system performance and computing complexity. Therefore, to improve the real-time performance of the proposed system, implementation of Block Matching with 3D filtering (BM3D) and DCT by Graphics Processing Units (GPUs) is introduced. According to DCT block size, i.e., 8×8, 16×16, and 32×32, the schemes DVCast8 , DVCast16 , and DVCast32 , respectively, are designed and implemented.Simulations show that DVCast with larger block size achieves better gain and visual quality than reference schemes. Moreover, it requires less computing time. DVCast32 outperforms conventional digital schemes by approximately 3.51 dB and achieves a 1.12 dB gain over state-of-the-art reference schemes. Furthermore, the analysis shows that DVCast can reduce overhead by at least 75%. |
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