Patent
1991-07-16
1994-11-22
Herndon, Heather R.
395140, 395162, G06F 1562
Patent
active
053676165
ABSTRACT:
An apparatus for adding isopleths to image data includes an input device for sequentially inputting image data to be displayed on an image screen of a display device, a horizontal delay circuit for delaying the inputted data by one horizontal scanning period, a column comparator for comparing the inputted data, that is, a sample, with a delayed sample from the horizontal delay circuit to thereby generate a signal indicating a sample to be converted into isopleth data, a sample delay circuit for delaying the sample outputted from the horizontal delay circuit by one sampling period, a row comparator for comparing the sample outputted from the horizontal delay circuit with the sample outputted from the sample delay circuit to thereby generate a signal indicating a sample to be converted into isopleth data, and an isoplete data generator responsive to the output of the column and row comparators for replacing the indicated input sample by predetermined distinguishable data and for outputting the predetermined distinguishable data to the display device.
REFERENCES:
patent: 4193122 (1980-03-01), Bowers
patent: 4674046 (1987-06-01), Ozeki et al.
patent: 4841292 (1989-06-01), Zeno
patent: 4945498 (1990-07-01), Mitamura
patent: 5038285 (1991-08-01), Jouandet
Abe Hitoshi
Tajima Katsutoshi
Takagi Tsutomu
Washiya Nobuhiro
Yoshida Naozane
Herndon Heather R.
Hitachi , Ltd.
Jankus Almis
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