Facsimile and static presentation processing – Static presentation processing – Attribute control
Patent
1988-06-03
1990-04-10
Shepperd, John W.
Facsimile and static presentation processing
Static presentation processing
Attribute control
H04N 978
Patent
active
049165275
ABSTRACT:
A luminance signal/color signal separation circuit comprises a color signal separation circuit for obtaining a first color signal partially including luminance signal component from a composite image signal, a computation circuit for obtaining a second color signal including a color separation error signal by eliminating the luminance signal component from the first color signal to take out a signal of the second highest potential of the first and second color signals and a reference potential, thus to take out a third color signal excluding the color separation error signal, and a luminance signal separation circuit for obtaining a luminance signal from the composite signal and the third color signal. This circuit is constituted to first consider a signal which seems to be a C signal as a C signal once at least to effect computation between that signal and current line data, whereby when the result thereof indicates that considering that signal as C signal is correct, that signal is used as C signal, while when erroneous, that signal is not used as C signal. Thus, drawbacks, e.g., dot crawl of Y signal and/or half tone or color shift of C signal do not occur.
REFERENCES:
patent: 4524382 (1985-06-01), Tanaka et al.
patent: 4570177 (1986-02-01), Kondo et al.
patent: 4661842 (1987-04-01), Ishige et al.
Shepperd John W.
Victor Company of Japan Ltd.
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