Transcoding of MPEG-2 video in the frequency domain

Assunção, Pedro; Ghanbari, Mohammed

doi:10.1109/icassp.1997.595329

Cited by 34 publications

(25 citation statements)

References 8 publications

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“…In [14], the shared information in a macroblock is used to speed up the process of IMC. It shows about 19% and 13.5% improvement over the method presented in [12], [13] respectively. In [15], a Macroblockwise Inverse Motion Compensation (MBIMC) scheme is presented to predict a complete macroblock in single step.…”

Section: Introductionmentioning

confidence: 79%

“…One has to reconstruct these motion compensated frames using inverse motion compensation(IMC) techniques before downscaling. This problem of inverse motion compensation (IMC) in DCT domain was studied in the work of Chang and Messerschmit [9], and subsequently in [12], [13], [14], [15]. Merhav [12] has proposed an excellent scheme to perform IMC in the DCT domain.…”

Section: Introductionmentioning

confidence: 99%

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An Integrated Approach for Downscaling MPEG Video

Porwal

Mukherjee

2006

Computer Vision, Graphics and Image Processing

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Abstract. Digital video databases are widely available in compressed format. In many applications such as video browsing, picture in picture, video conferencing etc. data transfer at lower bit rate is required. This requires downscaling of the video before transmission. The conventional spatial domain approach for downscaling video is computationally very expensive. The computation can greatly be reduced if downscaling and inverse motion compensation (IMC) are performed in Discrete Cosine Transform (DCT) domain. There are many algorithms in the literature to perform IMC in the DCT domain. In this paper, we propose an efficient integrated technique to perform IMC and downscaling in DCT domain. This new approach results in significant improvement in computational complexity.

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Section: Introductionmentioning

confidence: 79%

Section: Introductionmentioning

confidence: 99%

An Integrated Approach for Downscaling MPEG Video

Porwal

Mukherjee

2006

Computer Vision, Graphics and Image Processing

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“…The frequency-domain transcoders employing motion compensation in the DCT domain (MC-DCT) proposed in [4] and [5] achieve a reduction of 81% in computational complexity over the pixel domain transcoders proposed in [6] and [7].…”

Section: Introductionmentioning

confidence: 99%

A Novel Algorithm for Reducing Computational Complexity of MC-DCT in Frequency-Domain Video Transcoders

Nayak

Mehta

Desai

2005 IEEE International Symposium on Circuits and Systems

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Abstract-In order to transmit pre-encoded digital video over heterogeneous networks, it becomes necessary to employ transcoding techniques that convert pre-encoded video streams into streams having different bit rates and quality. This process is referred to as rate shaping or rate adaptation. Such video transcoders save computational overheads incurred in the IDCT (stream decode) and DCT (stream encode) operations, by performing motion compensation (MC) in the frequency (block-DCT) domain (MC-DCT). MC-DCT involves pre-and postmultiplication of 8 × 8 DCT blocks with 8 × 8 matrices derived from motion vectors. The specific contribution of this work is towards developing a novel method for implementing the preand post-multiplication with minimum computational overhead. The proposed method gives time savings of upto 50% over normal block multiplication.

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“…A closer look at (2)(3)(4)(5) indicates that all h matrices can be formed by cascading a diagonal of 1's from one end of an 8 × 8 matrix to the other.…”

Section: Proposed Scheme : a Unified Framework For Mc-dctmentioning

confidence: 99%

“…Frequency-domain transcoders employing MC-DCT ( [3], [4]) achieve a reduction of 81% in computational complexity over pixel domain transcoders ( [5], [6]). …”

Section: Introductionmentioning

confidence: 99%

A Unified MC-DCT Framework for Reducing the Computational Complexity of Frequency-Domain Transcoders for MPEG-2 Video

Nayak

Mehta

Desai

Seventh IEEE International Symposium on Multimedia (ISM'05)

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In order to transmit pre-encoded digital video over heterogeneous networks, it becomes necessary to employ transcoding techniques that convert pre-encoded video streams into streams having different bit rates and quality. Video transcoders save computational overheads incurred in the IDCT and DCT operations, by performing motion compensation (MC) in the frequency (block-DCT) domain (MC-DCT). Most of the computational complexity of the frequency-domain video transcoder comes from the MC-DCT operation. MC-DCT involves pre-and postmultiplication of

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Transcoding of MPEG-2 video in the frequency domain

Cited by 34 publications

References 8 publications

An Integrated Approach for Downscaling MPEG Video

An Integrated Approach for Downscaling MPEG Video

A Novel Algorithm for Reducing Computational Complexity of MC-DCT in Frequency-Domain Video Transcoders

A Unified MC-DCT Framework for Reducing the Computational Complexity of Frequency-Domain Transcoders for MPEG-2 Video

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