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Extra resources for 09.Circuits and Systems for Video Technology
However, this sequence of operations introduces delay and complexity, and results in a loss of quality. A common compressed representation from which a variety of low-resolution or higher resolution presentations can be easily derived is desirable. Such scalability of the compressed signal puts a constraint on the compression efficiency in the sense that algorithms with the highest compression efficiency usually are not very scalable. that sample. This converts the original signal into its unpredictable part (usually called prediction error).
In the digital domain, considerable flexibility exists by which the transmitter and the receiver can negotiate the parameters for scanning, resolution, and so forth, and thus create the best picture consistent with the capability of each sensor and display. The process of digitization of video consists of prefiltering, sampling, quantization, and encoding (see Fig. 3). Filtering This step is also referred to as prefiltering, since it is done prior to sampling. Prefiltering reduces the unwanted frequencies as well as noise in the signal.
Thus, to have available digital compression methods for full-resolution standard definition TV (SDTV) pictures such as shown in Fig. 4(a) or high definition TV (HDTV) pictures such as shown in Fig. 4(b), ISO (International Standard Organization) developed a second standard known colloquially as MPEG-2 and officially as ISO 13818. Since the resolution of entertainment TV is approximately four times that of videophone, the bit rate chosen for optimizing MPEG-2 was 4 Mbps. SUMMARY A brief survey of digital television has been presented in this article.