| 单词 | line scan |
| 释义 | > as lemmasline scan line scan n. (a) the motion of a scanning beam or spot along a line; (b) the electrical signal which causes this; (c) an apparatus or technique which scans an object or scene line by line. ΘΚΠ the world > physical sensation > sight and vision > optical skills and techniques > [noun] > optical scanning > line scan line scan1938 society > communication > broadcasting > television > visual element > [noun] > signals, types, or parts of picture frequency1926 picture signal1927 black level1935 line frequency1936 pedestal1937 line scan1938 picture black1938 white level1938 porch1941 test signal1945 spot wobble1950 luminance1953 society > communication > broadcasting > television > visual element > [noun] > scanning, etc. scanning1927 scanning spot1929 flying spot1933 interlacing1935 line scanning1935 interlace1936 line scan1938 matrixing1951 line blanking1952 society > communication > broadcasting > television > transmitting or receiving apparatus > [noun] > scanning devices mirror drum1927 scanning disc1927 scanner1929 Nipkow disc1934 line scan1938 scanning coil1938 the world > physical sensation > sight and vision > optical instruments > instruments for observing > [noun] > scanning devices > other scanning devices line scan1938 1938 J. H. Reyner Testing Television Sets iv. 46 If the time base is operating the appropriate noise will be heard—a rapid ticking on the frame scan and a high squeal on the line scan. 1957 D. G. Fink Television Engin. Handbk. x. 12 The harmonic components of the line-scan spectrum may thus be thought of as carrier waves, each with a 60-cps modulation envelope. 1962 Daily Tel. 28 Aug. 13/5 Line scan is a system for reconnaissance and mapping at low levels. 1966 D. G. Brandon Mod. Techniques Metallogr. 257 The line scans being automatically repeated 50 μm apart. 1971 Daily Tel. 22 Jan. (Colour Suppl.) 22/1 False colour photography..does not record gradations of temperatures exactly, and these can be very important. The instrument which does this is the infra-red linescan, which scans the scene line by line like a television scanner, building up a composite picture from the heat records. < as lemmas |
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