V. Parthasarathy, J. W. Modestino, and K. S. Vastola, "Design of a transport coding scheme for high quality video over ATM networks," IEEE Trans. CAS Video Tech., vol. 7, No. 2, pp. 358-376, Apr. 1997.  Home/Search   Document Not in Database   Summary   Related Articles   Check

....and ARQ based structure needs less overhead as compared to usage of FEC alone for similar visual quality. Work at the University of Southampton [17,39] also uses hybrid ARQ and unequal FEC codes to improve robustness in transport of DCT based compressed QCIF videophone sequences. Modestino et.al. [33] recently studied the design of forward error correction codes for video transmissin over ATM networks. Recent work by Han and Messerschmitt [16] provides a leaky ARQ scheme that successively improves the quality of delay non critical portions of graphics by sending more refined versions. It ....

V. Parthasarathy, J.W. Modestino, and K.S. Vastola. Design of a transport coding scheme for high-quality video over atm networks. IEEE Transactions on Circuits and Systems for Video Technology, 7(2):358--376, April 1997. 27

.... aim at limiting spatial and or temporal error propagation [11] 13] These techniques, however, do not take the local relevance of video data into account [14] Finally, in the third category, unequal error protection schemes try to efficiently recover the missing video information [15] [17]. They try to minimize degradation due to losses by providing class based degree of protection. Similar to the resynchronization techniques, the best results are however obtained only with a judicious packet prioritization process [18] 19] In this category, layered coding [20] 21] and the ....

V. Parthasarathy, J. W. Modestino, and K. S. Vastola, "Design of a transport coding scheme for high-quality video over ATM networks," IEEE Trans. Circuits Syst. Video Technol., vol. 7, pp. 358--376, Apr. 1997.

....high loss ratios. But, of course, concealment is less effective with high error rates. If a significant level of errors affect the bitstream (especially I or P frames) concealment is not sufficient. Other methods are necessary to recoevr an acceptable Quality of Service; these can be FEC 6 [Par97] methods, for example, or MPEG 2 compatible bitstream robustness improvements, as we will see later. 6 Forward Error Correction 7 3 Transmission Backgrounder 3.1 Overview The most interesting network protocols to consider today for broadband communication are the asynchronous transfer mode ....

Parthasarathy V., Modestino J. W. and Vastola K. S. Design of a Transport Coding Scheme for High-Quality Video over ATM Netwroks. IEEE Transactions on Circuits and Systems for Video Technology, 7(2):358--376, April 1997.

.... techniques aim at limiting spatial and or temporal error propagation [11 13] These techniques however do not take into account the local relevance of video data [14] Finally, in the third category, unequal error protection schemes try to eciently recover the missing video information [15 17]. They try to minimize degradations due to losses by providing di erent degrees of protection to each data classes. Similarly to the resynchronization techniques, the best results are however obtained only with a judicious packet prioritization process [18,19] In this category, layered coding ....

Parthasarathy V., Modestino J. W. and Vastola K. S. Design of a Transport Coding Scheme for High-Quality Video over ATM Networks. IEEE Transactions on Circuits and Systems for Video Technology, 7(2):358-376, April 1997.

....high loss ratios. But, of course, concealment is less effective with high error rates. If a significant level of errors affect the bitstream (especially I or P frames) concealment is not sufficient. Other methods are necessary to recoevr an acceptable Quality of Service; these can be FEC 6 [Par97] methods, for example, or MPEG 2 compatible bitstream robustness improvements, as we will see later. 6 Forward Error Correction 7 3 Transmission Backgrounder 3.1 Overview The most interesting network protocols to consider today for broadband communication are the asynchronous transfer mode ....

Parthasarathy V., Modestino J. W. and Vastola K. S. Design of a Transport Coding Scheme for High-Quality Video over ATM Netwroks. IEEE Transactions on Circuits and Systems for Video Technology, 7(2):358--376, April 1997.

....FEC and ARQ based structure needs less overhead as compared to usage of FEC alone for similar visual quality. Work at the University of Southampton [15,35] uses hybrid ARQ and unequal FEC codes to improve robustness in transport of DCT based compressed QCIF videophone sequences. Modestino et.al. [29] recently studied the design of forward error correction codes for video transmissin over ATM networks. Recent work by Han and Messerschmitt [14] provides a leaky ARQ scheme that successively improves the quality of delay non critical portions of graphics by sending more refined versions. It ....

V. Parthasarathy, Modestino J.W., and K.S. Vastola. Design of a transport coding scheme for high-quality video over atm networks. IEEE Transactions on Circuits and Systems for Video Technology, 7(2):358--376, April 1997.

....bits makes it necessary to reduce the source coder s data rate to avoid increasing network congestion. Active concealment has the advantage of permitting perfect reconstruction at the decoding end, if the amount of data lost is within the limit that the error control coding scheme can withstand [59, 60].In addition unequal error protection can be provided by varying the number of bits used according to the priority of the data being protected [2, 3, 61, 62, 63, 64, 65] Although passive concealment does not result in perfect reconstruction of the lost data, it is necessary in many applications ....

....encoders, the particular encoder being chosen according to the priority of the data being sent. Each coded block of data is then divided into groups of 384 bytes (the size of 8 ATM cells) The data in each group is interleaved to disperse the e#ect of packet loss over the entire coded block [59, 104]. After interleaving the data is sent across a data network. This was modeled as a queue with a fixed service rate and a finite input bu#er. Data packets arriving to the bu#er were queued for service if the bu#er capacity had not been exceeded, otherwise they were discarded. The arrival rate, #, ....

V. Parthasarathy, J. Modestino, and K. S. Vastola, "Design of a transport coding scheme for high quality video over ATM networks," IEEE Transactions on Circuits and Systems for Video Technology, vol. 7, no. 2, pp. 358--376, April 1997.

....2 : 1) decompression reconstruction: With further approximations, an optimized reconstructionbased DCT (ORB DCT) can be derived [58] that takes the same forms for both intra and inter coded blocks. Source coding and channel coding achieves error resilience by adding error correction codes [2, 46]. It differentiates from FEC in coder independent schemes because its distribution of protection is closely related to the sourcecoder output. For example, I frames are guarded by more protection bits in H.263 alike coders [2] Again, the use of such schemes in video communications must be based ....

V. Parthasarathy, J. W. Modestino, and K. S. Vastola. Design of a transport coding scheme for high quality video over ATM networks. IEEE Trans. on Circuits and Systems for Video Technology, 7(2):358-376, Apr. 1997.

....to buffer overflow during multiplexing [1] Several approaches have been proposed in order to recover or at least ameliorate the effect of cell loss during data transmission. Among the most important are Forward Error Control (FEC) and Error Concealment (EC) with interleaving (see [2] 3] 4] [5], 12] FEC is an open loop scheme that involves the transmission of fixed redundant information along with the original data so that in case of cell losses, this lost information can be fully recovered at the receiver. The advantage is that there is no retransmission of information as in ....

V. Parthasarathy, J W. Modestino, and K. Vastola, "Design of Transport Coding Scheme for High-Quality Video over ATM Networks", in IEEE Trans. Circuits Syst. Video Technol., vol. 7, no. 2, April 1997.

....against transmission error propagation, scalability, and low computational complexity. 3. CHANNEL CODING AND PACKETIZATION In the past decade, there have been intensive research in video transmission over ATM networks mainly focusing on the wireline case. In most of the developed schemes [5, 6, 7, 8], there is limited interaction among the source codec, channel codec, and packetizer, i.e. they usually apply equal error protection (EEP) making little use of the semantics of the video bitstream. Recently, unequal error protection (UEP) is proposed to increase the quality of the decoded video ....

....packetized into ATM cells in column major order. After interlaced unequal FEC, ATM cells are directly sent to the ATM layer (bypassing the AAL) in row major order. The ATM layer is responsible for adding the usual five byte header to each cell. The major enhancements of the proposed scheme over [6, 8] include (1) SN and CRC to detect lost ATM 0 12 25 38 50 62 75 Unit Number 0 25 50 75 100 125 150 175 200 Cell Number Total Number of Cells Erroneous Cells Figure 5: Transmitted and erroneously received ATM cells per coding unit. cells, so as to double the error correction ....

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V. Parthasarathy, J.W. Modestino, and K.S. Vastola, "Design of a transport coding scheme for high-quality video over ATM networks," IEEE Transactions on Circuits and Systems for Video Technology, vol. 7, no. 2, pp. 358--376, Apr. 1997.

....in [12, 6] The base layer is transmitted through a lossless channel, whereas the enhancement layer is sent over a low priority channel. In the event of cell loss, the base layer is used to reassemble the video sequence. Alternative techniques for reducing the e#ect of cell loss were proposed in [5, 15]. In [5] the underlying idea is to decrease the data rate of the encoded bitstream when the cell loss rate temporarily increases. A similar approach for subband coded sequences is described in [15] wherein 2 The cell loss priority flag is a single bit present in the 5 byte header of each cell. ....

....the video sequence. Alternative techniques for reducing the e#ect of cell loss were proposed in [5, 15] In [5] the underlying idea is to decrease the data rate of the encoded bitstream when the cell loss rate temporarily increases. A similar approach for subband coded sequences is described in [15], wherein 2 The cell loss priority flag is a single bit present in the 5 byte header of each cell. When set to 0, this bit indicates that its cell has higher priority than cells with CLP bits set to 1 [14] Thus the cell is not to be discarded, for instance, in the case of bu#er overflow. 6 ....

V. Parthasarathy, J. Modestino, and K. S. Vastola, "Design of a transport coding scheme for high quality video over ATM networks," IEEE Transactions on Circuits and Systems for Video Technology, vol. 7, no. 2, pp. 358--376, April 1997.

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V. Parthasarathy, J. W. Modestino, and K. S. Vastola, "Design of a transport coding scheme for high quality video over ATM networks," IEEE Trans. CAS Video Tech., vol. 7, No. 2, pp. 358-376, Apr. 1997.

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Parthasarathy V., Modestino J. W. and Vastola K. S., Design of a Transport Coding Scheme for High-Quality Video over ATM Networks, IEEE Transactions on Circuits and Systems for VideoTechnology,vol. 7, pp. 358376, April 1997.

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Parthasarathy V., Modestino J. W. and Vastola K. S., \Design of a Transport Coding Scheme for High-Quality Video over ATM Netwroks," IEEE Transactions on Circuits and Systems for Video Technology 7, pp. 358-376, April 1997.

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