Digital HDTV compression using parallel motion-compensated transform coders

Hang, Hsueh-Ming; Leonardi, Riccardo; Haskell, Barry G.; Schmidt, Robert; Bheda, H.; Othmer, J.

doi:10.1109/76.97976

Cited by 7 publications

(4 citation statements)

References 8 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The frequency-dependent step size design implies a frequency-weighted bit allocation scheme discussed in Section II-A in the sense that some frequency components get assigned fewer bits because their actual step sizes used in quantization are larger; that is [from 12 They completely describe the bits and distortion behavior of an MPEG or JPEG transform coder under the ergodic Gaussian signal assumption. A special case that and for all has been reported in [7].…”

Section: Practical Transform Codermentioning

confidence: 87%

“…A case of interest is that at low distortion when (or is empty), (4) becomes . And thus, (5) becomes (6) or (7) where (8) Essentially, we are approximating a joint Gaussian source by multiple i.i.d. Gaussian sources.…”

Section: Region and Regionmentioning

confidence: 99%

“…If the approximation errors can be viewed as white noise, because the power of high frequency components is much lower than that of low frequency components for typical images, the SNR values of high frequency components are smaller. According to (7) and (8), the total distortion is proportional to the product of component power. Hence, a 50% error in one component would translate to 50% total error.…”

Section: Region and Regionmentioning

confidence: 99%

“…Although the analytic model of a simple quantizer already existed for a long time [4]- [6], the complete analysis of a standard transform coder has not, to our knowledge, been fully explored. An attempt is made by Hang et al [7], but it does not contain rigorous theoretical justification. On the other hand, several studies on source modeling [8], [9] based on the empirical data have been reported.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Source model for transform video coder and its application. I. Fundamental theory

Hang

Chen

1997

IEEE Trans. Circuits Syst. Video Technol.

224

View full text Add to dashboard Cite

A source model describing the relationship between bits, distortion, and quantization step sizes of a large class of block-transform video coders is proposed. This model is initially derived from the rate-distortion theory and then modified to match the practical coders and real image data. The realistic constraints such as quantizer dead-zone and threshold coefficient selection are included in our formulation. The most attractive feature of this model is its simplicity in its final form. It enables us to predict the bits needed to encode a picture at a given distortion or to predict the quantization step size at a given bit rate. There are two aspects of our contribution: one, we extend the existing results of rate-distortion theory to the practical video coders, and two, the nonideal factors in real signals and systems are identified, and their mathematical expressions are derived from empirical data. One application of this model, as shown in the second part of this paper, is the buffer/quantizer control on a CCITT P 2 64 k coder with the advantage that the picture quality is nearly constant over the entire picture sequence.

show abstract

Section: Practical Transform Codermentioning

confidence: 87%

Section: Region and Regionmentioning

confidence: 99%