Method for processing picture information having a large dynamic

Details Method for processing picture information having a large dynamic Method for processing picture information having a large dynamic

1986-10-28

1988-09-20

Ng, Jin F.

Facsimile and static presentation processing

Facsimile

Recording apparatus

358223, H04N 5228, H04N 5235

Patent

active

047729538

ABSTRACT:
The blooming effect in pictures of a television camera tube (such as a vidicon, an orthicon or an isocon) is counteracted by setting the cathode potential to a first standard value during one scan of the scanning electron beam and to a second value during a number of subsequent scans of the scanning electron beam. During the one scan picture information is obtained both about bright and dark parts of the picture. During the subsequent scans only picture information is obtained from relatively bright parts of the picture. The videosignals of the different scannings are stored and combined. The resulting combined videosignal comprises picture information about bright or dark parts of the image that otherwise would have been lost.

REFERENCES:
patent: 3691302 (1972-09-01), Gaebele et al.
patent: 3955116 (1976-05-01), van den Berg
patent: 4229767 (1980-10-01), Ryan
patent: 4365271 (1982-12-01), Blom
patent: 4379310 (1983-04-01), Bendell
patent: 4380028 (1983-04-01), Pepin et al.
patent: 4387403 (1983-06-01), van Buul

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