基于MPEG-4的視頻聯(lián)合信源信道編碼
Joint Source Channel Coding of MPEG-4 Video
-
摘要: 該文提出了一種用于提高M(jìn)PEG-4碼流在噪聲信道下的抗誤碼性能的聯(lián)合信源信道編碼方法。該方法將MPEG-4基本層按重要性進(jìn)行碼流重排后進(jìn)行交織打包，并根據(jù)率失真函數(shù)將基本層紋理信息進(jìn)一步劃分為多個(gè)子層。編碼器根據(jù)反映信道狀態(tài)的反饋信息動(dòng)態(tài)地調(diào)整傳輸?shù)淖訉訑?shù)目和每個(gè)子層的糾錯(cuò)強(qiáng)度(信道編碼速率)，使得系統(tǒng)失真最小。仿真結(jié)果表明，該方法明顯優(yōu)于未保護(hù)的MPEG-4方法，在相同信道帶寬及丟包率條件下比等糾錯(cuò)保護(hù)的MPEG-4編碼方法獲得更加穩(wěn)定的性能。同時(shí)由于該方法根據(jù)反饋的出錯(cuò)分組數(shù)進(jìn)行傳輸子層數(shù)和糾錯(cuò)強(qiáng)度的聯(lián)合優(yōu)化，與Puri等人提出的按照確定信道條件設(shè)計(jì)目標(biāo)函數(shù)進(jìn)行優(yōu)化的MDFEC方法相比，更能夠適應(yīng)信道條件的變化，從而獲得更高的性能。
-
關(guān)鍵詞:
- MPEG-4;聯(lián)合信源信道編碼; Reed-Solomon(RS); 率失真
Abstract: A new robust joint source channel coding method for MPEG-4 video over noisy channel is proposed. In the method, the base layer bit streams are reordered according to their relative importance and then interlaced packetized. Multiple sub-layers of texture information are generated based on their rate distortion function, the number of which is adjusted dynamically by the encoder according to the feedback information to minimize the overall distortion. Simulation results show that the method has the performance obviously higher than that of un-protected MPEG-4, and can be more stable than MPEG-4 equal error protection method under the same conditions of bandwidth and packet loss rate. Since the method makes joint optimization to the the number of transmission sublayers and the protection level according to the feedback parameter, it can be more adaptive to the channel situation and can obtain higher performance compared with MDFEC method proposed by Puri, which design the object functions and perfoms optimization according to the fixed channel situation. -
Sherwood P G, Zeger K. Progressive image coding for noisy channel[J].IEEE Signal Processing Letters.1997, 4 (7):189-191[2]Lu J, Nostratinia A, Aazhang B. Progressive source channel coding for images over bursty error channels. Proceedings ofInternational Conference on Image Processing, Chicago,Oct.1998: 127-131.[3]Chande V, Farvardin N. Joint source-channel coding for progressive transmission of embedded source coder. Proceedings of Data Compression Conference, Utah, Mar.1999: 52-61.[4]Alatan A Aydin, Zhao M, Akansu Ali N. Unequal error protection of SPIHT encoded image bit streams[J].IEEE J.on Select. Areas Commun.2000, 18 (6):814-818[5]Brystrom M, Modestino J W. Combined source channel coding for transmission of video over a slow-fading Rician channel. Proceedings of International Conference on Image Processing, Chicago, Oct.1998, 2: 147-151.[6]Tse-Hua Lan, Tewfik A H. Power optimized mode selection for H.263 video coding and wireless communications. Proceedings of International Conference on Image Processing, Chicago, Oct.1998, 2: 113-117.[7]Zheng H, Liu K J R. Image and video transmission over wireless channel: A subband modulation approach. Proceedings of International Conference on Image Processing, Chicago, Oct.1998, 2: 132-136.[8]Boyce Jill M. Packet loss resilient transmission of MPEG video over the Internet[J].Signal Processing: Image Communication.1999, 15(1-2):7-24[9]Rohit Puri, Kang-Won Lee, Vaduvur Bharghavan, An integrated source transcoding and congestion control paradigm for video streaming in the Internet. IEEE Trans[J].on Multimedia.2001, 3(1):18-32[10]Gilbert E N. Capacity of a burst-noise channel. Bell Syst. Tech. J., 1960, 39(5): 1253-1265. -
計(jì)量
- 文章訪問(wèn)數(shù): 2459
- HTML全文瀏覽量: 98
- PDF下載量: 782
- 被引次數(shù): 0
下載:
