ATM網(wǎng)中可變比特率小波視頻編碼和碼率控制
VBR WAVELET VIDEO CODING AND RATE CONTROL IN ATM NETWORKS
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摘要: 本文提出了小波視頻編碼系統(tǒng)及其碼率控制的新方法。對原始圖像序列進(jìn)行時間、水平和垂直三維小波分解,并采用改進(jìn)的等級樹集合分區(qū)的算法對小波系數(shù)進(jìn)行量化。在圖像組級上對該編碼器進(jìn)行碼率控制,使其輸出碼流遵循漏桶控制器的參數(shù),并對不同大小的漏桶緩沖器進(jìn)行了討論。仿真實(shí)驗(yàn)證明了該編碼系統(tǒng)及其碼率控制方法的有效性。
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關(guān)鍵詞:
- ATM網(wǎng)絡(luò); 視頻編碼; 小波變換; 碼率控制
Abstract: In this paper, a new video coding system based on wavelet transform is presentea,and a rate centrel algorithm is preposed for it．First: 3D wavelet transform is performed to the original image sequence,and an extension of set partitioning in hierarchical trees algorithm is used to quantize the wavelet coefficients.the rate of the coder is contrelled at GOP scale.ensuring that output conforms to the parameters of a leaky bucket Controller.Several leaky buckets with different sizes are discussed too.The simulation shows the efficiency of our coding system and rate control algorithm. -
Garrett M W，Willinger W．Analysis，modeling and generation of self-similar VBR video traffic.in Proc．SigComm.,ACM，New Mexico、USA：Sept，1995[2]Heeke H．A traffic control algorithm for ATM networks IEEE Trans.on Circuits and Syst.,Video Technol 1993、CAS VT-3(3)：182-189．[3]Reibman A R，Haskell B G．Constraints on variable bit rate video for ATM networks．IEEE Trans.on Circuits and Syst，Video Technol 1992，CAS VT-2(6)：361-372．[4]Coelho R, Tohme S．Video Coding Mechanism to Predict Video Traffic in ATM, Networks in Proc．IEEE GLOBECOM93，Orlando，USA：1993，447-451．[5]LeGall D J. The MPEG video compression algorithm．Signal Processing：Image Commun，1992、4(2)：129-140[6]Shapiro J M．Embedded image coding using zerotrees of wavelets coefficients．IEEE Trans.on Signal Processing：1993，SP-41(12)：3445-3462．[7]Said A, Pearlman W A.A new,fast, and efficient image codec based on set partitioning in hierarchicl trees IEEE Trans.on Circuits and Syst.,Video Technology, 1996, CAS VT-6(3): 243-249. -
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