Proceedings ArticleDOI
Hybrid DFT/DPCM interframe image quantization
William A. Pearlman,P. Jakatdar +1 more
- Vol. 6, pp 1121-1124
TLDR
A non-adaptive scheme for encoding an image sequence is described that yields better results than any previous comparable interframe image coding method and uses a full image DFT and an optimal quantization algorithm.Abstract:
A non-adaptive scheme for encoding an image sequence is described that yields better results than any previous comparable interframe image coding method. The scheme uses a hybrid of two-dimensional transform coding for the spatial dimension and DPCM for the time dimension similar to some previous works [e.g., 1]. Unlike the previous efforts, which use discrete cosine transforms (DCT's) of image subblocks and suboptimal quantization, we utilize a full image DFT and an optimal quantization algorithm. The results with the standard sixteen frame sequence of Walter Cronkite are visually superior to previous transform coding efforts, especially at rates lower than 1 bit/pixel/ frame. The signal-to-noise ratios are higher than those of nonadaptive hybrid DCT/DPCM in [1] by 2.6 to 10.5 dB depending on rate.read more
Citations
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Journal ArticleDOI
Advances in picture coding
TL;DR: This paper presents a review of the advances in digital coding of video signals during the last four years, and summarizes the first promising results of motion adaptive frame interpolation.
Journal ArticleDOI
Fixed and Adaptive Predictors for Hybrid Predictive/Transform Coding
TL;DR: The usual formulation is to first apply a unitary transform and then code the transform coefficients with independent DPCM coders, i.e., the prediction is performed in the transform domain, while the spatial domain structure is preferred for motion compensation and for line interlaced video signals.
Journal ArticleDOI
Interfield Hybrid Coding of Component Color Television Signals
Farhad Kamangar,K. Rao +1 more
TL;DR: It is shown that the interfield adaptive hybrid coding of color TV signals in component form results in significant savings in bit rates for transmission over a digital link.
References
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