Journal ArticleDOI
Adaptive sub-band DCT coding for HDTV signal transmission
Kazunari Irie,Ryozo Kishimoto +1 more
TLDR
An adaptive sub-band DCT coding for high-quality HDTV signal transmission and a coder configuration that reduces noise accumulation to less than 1 dB after three tandem links is proposed.Abstract:
This paper presents an adaptive sub-band DCT coding for high-quality HDTV signal transmission. In the coder, the first stage quadrature mirror filters (QMFs) decompose the input signal into two bands in the horizontal direction, while the second stage filters decompose the two bands into four bands in the vertical direction. An adaptive DCT is adopted for horizontal-low and vertical-low (LL) signal coding. To maximize bit-rate reduction efficiency, this paper proposed adaptive selection of the input signal mode to the DCT coding from the intra-field signal as well as the inter-field and motion compensated inter-frame signals. One-dimensional DPCM coding is applied to the signals on the same horizontal line of the LH band. The other-band signals are coded by PCM having a dead zone. To further reduce information bit-rates, variable length coding and run-length coding are applied to the quantized signal in each band. Computer simulation results are presented in terms of bit-per-pel and SNR of the reconstructed picture. This paper also presents codec characteristics when it is connected in tandem. It focuses mainly on causes of quantization-noise accumulation in digital tandem connections which are essential to coding algorithms. A coder configuration that reduces noise accumulation to less than 1 dB after three tandem links is proposed.read more
Citations
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Patent
Compression of video signals
TL;DR: In this paper, a digital video signal is compressed by spatial sub-band filtering to form data sets constituting respective sub-bands of the two-dimensional spatial frequency domain, and the quantized data sets are then encoded in an entropy encoder which has a first coding portion for coding quantised data representative of dc luminance information and a second coding portion to represent ac luminance.
Patent
Method and apparatus for picture coding and method and apparatus for picture decoding
TL;DR: In this paper, an excellent picture coding scheme, adapted to suit any particular picture movement, divides an input picture data into two-dimensional small blocks including frame small blocks and field small blocks.
Patent
Storage of video signals
TL;DR: In this paper, the authors propose a quantiser that quantises the data sets in accordance with respective values, such that the amount of quantisation of one of the data set constituting a sub-band to which dc luminance information of the signal is at least predominantly confined is less than the average of the amounts of quantization of the remaining data sets, and an entropy encoder that encodes at least some of the quantised data sets.
Journal ArticleDOI
Classification and overview of research in real-time imaging
TL;DR: A classification scheme is outlined and an overview of current research in real-time imaging is provided to lend structure to this growth.
Journal ArticleDOI
Motion compensation and multiresolution coding
TL;DR: This paper addresses the problem of motion compensation in a multiresolution environment, considering both QMF-SBC and wavelet transform approaches, and different motion compensation schemes are derived and their efficiency is considered with regard to scalability and to the lengths of subband analysis and synthesis filters.
References
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Journal ArticleDOI
Sub-band coding of monochrome and color images
H. Gharavi,A. Tabatabai +1 more
TL;DR: An efficient subband coding method for encoding monochrome and color images is presented and results indicate that good quality reproduction can be achieved at high compression rates.
Proceedings ArticleDOI
Application of quadrature mirror filtering to the coding of monochrome and color images
H. Gharavi,A. Tabatabai +1 more
TL;DR: Simulation results show that, by using a DPCM coding scheme, good quality pictures can be reconstructed at low transmission rates.
Journal ArticleDOI
Bit-rate reduction in the transmission of high-definition television signals
TL;DR: Systeme de reduction d'un quart des donnees d'origine utilisant une combinaison de multiplexage a compression de temps, sous-echantillonnage and modulation d'impulsions codees intraimage.
Proceedings ArticleDOI
Multiprocessor DSP With Multistage Switching Network And Its Scheduling For Image Processing
TL;DR: A dynamic load balancing method using a multistage switching network is proposed to solve one of the greatest problems in multiprocessor DSPs for image processing: load concentration on certain processors.