MCPIC: a video coding algorithm for transmission and storage applications

Wong, Andria H.; Chen, C.-T.; Gall, D.J. Le; Jeng, Fure-Ching; Uz, K.M.

doi:10.1109/35.60375

Cited by 25 publications

(6 citation statements)

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“…The term "asymmetric" in ADSL refers to a high data rate in one direction only, as ADSL is distinguished from HDSL, the latter of which is bidirectional and will only be offered for the restricted set of loops within the so-called carrier serving area (CSA)'. Furthermore, HDSL is intended for conventional T1 or,DSl data rate services, while ADSL is a consumer service with the intended application being the transmission of compressed TV-quality video (see [2]) with distribution over almost the entire loop plant, including those outside of the CSA. Lastly, ADSL is also currently being considered, for economiCal reasons, to be superimposed on the same single twisted pair that delivers basic-rate access ISDN service [or possibly the plain-old telephone service (POTS)] while HDSL will be a substitute service for basic-rate access ISDN or POTS.…”

Section: Introductionmentioning

confidence: 99%

Performance evaluation of a multichannel transceiver system for ADSL and VHDSL services

Chow

Cioffi

1991

IEEE J. Select. Areas Commun.

131

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Section: Introductionmentioning

confidence: 99%

Performance evaluation of a multichannel transceiver system for ADSL and VHDSL services

Chow

Cioffi

1991

IEEE J. Select. Areas Commun.

131

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“…Step Size Fine Adjustment: The local spatial activity of macroblock is first computed as (11) Then normalized local activity of macroblock is defined as (12) Last, the final quantizer step size of macroblock is calculated as (13) where the average\_act indicates the average spatial activity of the previous coded picture. Detailed MPEG-2 TM5 ratecontrol strategy can be found in [5].…”

Section: ) Macroblock Quantizermentioning

confidence: 99%

“…The adjustment is made according to the short-term buffer occupation and variation tendency state, local scene activity, and the establishment of the statistical rate model from test images [7]- [13]. In most of the algorithms, the coding parameters and quantizer scaling factors are determined based on information derived from coded data.…”

Section: Introductionmentioning

confidence: 99%

An active scene analysis-based approach for pseudoconstant bit-rate video coding

Fan

Kan

1998

IEEE Trans. Circuits Syst. Video Technol.

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Digital video transmission across the network is now widely used in the Internet community. Visual information transmission will no doubt play an important role in a future national information infrastructure (NII) [1]. Very often, however, the channel bandwidth is fixed. Therefore, video coding based on an appropriate bit-rate control is a key to the success of accommodating visual communication in NII. In this paper, an extremely efficient rate-control algorithm for pseudoconstant bitrate video coder is proposed. The proposed technique, adaptive scene analysis, intelligently collects required information to obtain estimated bit counts from the previous, present, and future frames. This collected intelligent information is then employed to govern the resource allocation so that better objective quality can be achieved under the bit-rate restriction. Combined with a series of dynamic rate-control schemes, the proposed algorithm demonstrates impressive quality transition between successive frames. In addition, the bit-rate irregularities caused by dramatic scene transition can be smoothed out in a very short period. A comparison with the MPEG-2 Test Model 5 is also presented in this paper.Index Terms-Active sequence analysis, motion estimation, quantizer scaling factor, rate buffer control.

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“…One option would be to generate a truly VBR, constant quality stream without any rate control, bu ers or quantization feedback. Another possibility is to generate a Constant Bit Rate (CBR) stream in which quantization feedback is applied to implement a leaky bucket rate control mechanism in order to avoid bu er over ow or under ow 17,27].…”

Section: Introductionmentioning

confidence: 99%

Cost analyses for VBR video servers

Chang

Zakhor

1996

IEEE Multimedia

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In this paper we compare techniques for storage and real-time retrieval of Variable Bit Rate (VBR) video data for multiple simultaneous users. The motivation for considering VBR is that video results in inherently time varying data, and as such, with the same average bit rate, higher quality can be achieved with VBR than with Constant Bit Rate (CBR). We propose and compare the following three classes of VBR data placement and retrieval techniques: Constant Time Length (CTL) places and retrieves data in blocks corresponding to equal playback durations, Constant Data Length (CDL) places and retrieves constant-sized data blocks, and a hybrid solution uses CDL placement but retrieves a variable number of blocks in each service round. We have found that CTL data placement has much lower bu er requirements than CDL but su ers from fragmentation during video editing. We show hybrid placement to have both advantages of high e ciency and low fragmentation.We also address the issue of admission control policies by comparing statistical and deterministic techniques. \Statistical" admission control uses statistics of the stored data to ensure that the probability of \overload" does not exceed a prespeci ed threshold. \Deterministic" control uses the actual stored video bit traces to regulate the number of admitted users. We consider two types of deterministic admission control: data-limit and ideal deterministic. Data-limit admission control admits users based on precomputing the total amount of data requested by all users in future service rounds. In contrast, Ideal deterministic admission control not only precomputes the total amount of data requested, but also assumes we have control of data placement at the disk sector level in order to precompute the future seek and rotation times.We provide a cost/bene t analysis of the above placement/retrieval/admission control techniques and conclude that CTL and hybrid placement/retrieval techniques can reduce the total system cost by up to a factor of 3 in comparison with the strategy of padding the VBR video trace to achieve a constant data rate. For read-only systems, CTL has the lowest cost per user. For writable systems, the hybrid technique achieves a good compromise between low cost and low fragmentation. We nd that all forms of deterministic admission control can outperform statistical, but the greatest gain comes from using ideal deterministic admission control. We note, however, that this admission control may be di cult to implement on standard disk controllers. Finally, we have implemented a full disk model simulator that operates 1000 times faster than the real-time disk. Results using the simulator are very close to those measured on the real disk, making the simulator useful for future experiments.

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MCPIC: a video coding algorithm for transmission and storage applications

Cited by 25 publications

References 1 publication

Performance evaluation of a multichannel transceiver system for ADSL and VHDSL services

Performance evaluation of a multichannel transceiver system for ADSL and VHDSL services

An active scene analysis-based approach for pseudoconstant bit-rate video coding

Cost analyses for VBR video servers

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