Computer graphics processing and selective visual display system – Computer graphic processing system – Plural graphics processors
Patent
1996-06-18
1998-11-24
Tung, Kee M.
Computer graphics processing and selective visual display system
Computer graphic processing system
Plural graphics processors
345196, 345523, G06F 1300
Patent
active
058414452
ABSTRACT:
An image displaying apparatus comprises a line memory from which each line period segment of a first video signal is read during a half line period to produce a first half line period video signal segment, first and second field memories, from each of which each of line period segments contained in each odd or even field period portion of a second video signal is read during a half line period to produce a second or third half line period video signal segment, a signal selector operative to extract alternately the first and second half line period video signal segments to form a first field period video signal portion or extract alternately the first and third half line period video signal segments to form a second field period video signal portion, a dual image display portion for displaying double window picture images in response to the first and second field period video signal portions, an overtaking detector for detecting an overtaking reading condition possibly caused in the first and second field memories, and a writing and reading controller operative to control a timing for writing and reading of the field period portions in the first field memory and a timing for writing and reading of the field period portions in the second field memory so as to suppress defects of display resulting from the overtaking reading and appearing on the double window picture images displayed on the dual image display portion when the overtaking reading condition is detected by the overtaking detector.
REFERENCES:
patent: 4292652 (1981-09-01), Yumde et al.
patent: 4833371 (1989-05-01), Boon et al.
Masuda et al. "Picture in picture system with a digital memory for VCRs" IEEE Transactions on Consumer Electronics, vol. 33, No. 3 1987, New York pp. 230-238.
Abe et al. "Double-Window TV Display Full-Color Images Side by Side" JEE Journal of Electronics Engineering, vol. 31, No. 334, Oct. 1994, Tokyo, pp. 35-37.
Hamamatsu Toshihiko
Kondo Makoto
Suematsu Masayuki
Maioli Jay H.
Sony Corporation
Tung Kee M.
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