Television – Format conversion – Line doublers type
Patent
1993-10-05
1996-05-14
Groody, James J.
Television
Format conversion
Line doublers type
348446, H04N 701
Patent
active
055172474
ABSTRACT:
Video signals of interlaced form are first converted to progressive scan (non-interlaced) form and then picture elements are generated that lie between the "progressive" picture elements and are interpolated by a vertical one-half (1/2) line shuffling by application of a vertical averaging. The interpolated picture elements are buffer stored and are read out again at twice the frame repetition rate whereby each second line of the stored interpolated picture elements is emitted delayed in time by 10 milli-seconds. Fields in the format 100 Hz, 2:1 interlace thereby ensue. Advantageously, interpolated picture elements are used in all of the output fields thereby avoiding picture disturbences at the frame rate (25 Hz) of the original video signal. For increasing the subjective vertical sharpness, a vertical peaking may additionally be carried out.
REFERENCES:
patent: 4745458 (1988-05-01), Hirano et al.
patent: 5081532 (1992-01-01), Rabii
patent: 5185663 (1993-02-01), Hackett
Hentschel, Christian: Theoretischer und subjektiver Vergleich verschiendener Flimmerreduktionsverfahren In: Rundfunktech. Mitteilunger, Jg 31, 1987, H.2, S.75-82.
van Buul, M. C. W.: vin de Polder, L. J.: Standards conversion of a videophone signal with 313 lines into a TV signal with 625 lines. In. Philips Res. Rpts., vol. 29, No. 5, Oct. 1974, S.413-428.
Correa Carlos
Stolte John
Coalter Richard G.
Cohen Cheryl
Deutsche Thomson-Brandt GmbH
Emanuel Peter M.
Groody James J.
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