Adaptive signal processing for digital HDTV 280 Mbit/s transmission
| Autor: | G. Schamel |
|---|---|
| Přispěvatelé: | Publica |
| Jazyk: | angličtina |
| Rok vydání: | 1988 |
| Předmět: |
television systems
280 mbit/s Computer science two-stage coding system Luminance human visual system horizontal band limiting intrafield dpcm digital HDTV signal Computer vision Electrical and Electronic Engineering predictive coding Digitization adaptive signal processing fieldquincunx High-definition television analogue-digital conversion spatio temporal subsampling prefiltering business.industry television broadcasting video signals Quantization (signal processing) linequincunx sampling patterns interpolation quantizer Adaptive filter luminance signal interlaced source signal computerised picture processing filtering and prediction theory Control and Systems Engineering digital filter chrominance signals digitization Signal Processing Human visual system model Chrominance Computer Vision and Pattern Recognition Artificial intelligence Chroma subsampling business Digital filter Software Interpolation |
| Popis: | A two-stage coding system for reducing the high data rate of a digital HDTV signal ( approximately=1 Gbit/s) is described. Spatio-temporal subsampling of the interlaced source signal is used in conjunction with an intrafield DPCM of the remaining samples. For the luminance signal two well-known sampling patterns, fieldquincunx and linequincunx, are proposed; both provide a 2:1 subsampling. Prior to subsampling, a digital filter which adapts itself to the movement in the scene, adjusts the three-dimensional spectrum of the television signal to some reduced region supported by the sampling pattern and the properties of the human visual system. Different filter structures are suggested for prefiltering and for interpolation of the missing samples in the receiver. The chrominance signals are horizontally bandlimited before digitization. A modified linequincunx sampling structure is used for subsampling the chrominance signals. Two-dimensional digital prefilters and interpolators are required. Then predictive coding with a fixed quantizer and predictor is applied to the picture elements which remain in the luminance and chrominance paths after subsampling. Sixteen quantization levels are used for the luminance and for each chrominance component to reduce the whole data rate to less than 280 Mbit/s. |
| Databáze: | OpenAIRE |
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