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For each scan line, a small period of time (16% to 18% of total line time), called blanking or retrace, is allocated to return the scanning beam to the left edge of the next scan line. European systems (PAL and SECAM) have 625 lines/frame, but 50 fields/s. The larger number of lines results in better vertical resolution, whereas larger numbers of frames result in better motion rendition and lower flicker. While there is no agreement worldwide yet, high definition TV (HDTV) will have approximately twice the horizontal and vertical resolution of standard television.
518 DIGITAL-TO-ANALOG CONVERSION BIBLIOGRAPHY 1. P. Mertz and F. Gray, A theory of scanning and its relation to the characteristics of the transmitted signal in telephotography and television, Bell Syst. Tech. , 13: 464–515, 1934. 2. W-T. Wintringham, Color television and colorimetry, Proc. IRE, 39 (10): 1951. 3. K. B. ), Television Engineering Handbook, New York: McGraw-Hill, 1986. 4. A. Netravali and B. G. Haskell, Digital Pictures, New York: Plenum, 1988. 5. B. G. Haskell, A. Puri, and A. N.
However, interlace often shows flickering artifacts in scenes with sharp detail and has poor motion rendition, particularly for fast vertical motion of small objects. In addition, digital data compression is more easily done on progressively scanned frames. Compatibility with film and computers also favors progressive scanning. In the future, since different stages of the television chain have different requirements, it is likely that creation (production studios), transmission, and display may employ different scanning methods.