US 4,791,487 A · Picture signal conversion device

Abstract

A picture signal conversion device arranged to obtain an interpolation signal by using a scanning line signal of a first picture signal which has scanning line signals corresponding to a predetermined number of scanning lines within one field period and to convert the first picture signal into a second picture signal which has a greater number of scanning lines than that of the first picture signal comprises: first interpolation signal generating means which generates a first interpolation signal for the present field by using a scanning line signal obtained within the present field; second interpolation signal generating means which generates a second interpolation signal for the present field by using a scanning line signal of another field; output means arranged to detect the correlativity of scanning line signal between fields and to selectively produce, according to the detected correlativity, the first or second interpolation signal generated from the first or second interpolation signal generating means; and detection characteristic control means for controlling the correlativity detecting characteristic of the output means according to the inclination of the correlativity among scanning lines obtained within a predetermined period.

Claims31

Dependent claims

A picture signal conversion device arranged to obtain an interpolation signal by using a scanning line signal corresponding to a predetermined number of scanning lines within one field period and to covert said first picture signal into a second picture signal which has a greater number of scanning lines than that of said first picture signal, comprising:

(a) first interpolation signal generating means which generates a first interpolation signal for the present field by using a scanning line signal obtained within the present field;
(b) second interpolation signal generating means which generates a second interpolation signal for the present field by using scanning line signals of other fields;
(c) correlativity detecting means for detecting correlativity between scanning line signals of other fields by comparing a difference in signal level between said scanning line signals of the other fields and a threshold level;
(d) output means arranged to selectively output said first or second interpolation signal generated from said first or second interpolation signal generating means, in accordance with the correlativity detected by said correlativity detecting means;
and
(e) threshold control means for controlling said threshold level in accordance with a variation of the correlativity detected by said correlativity detecting means within a predetermined period.

3 more elements

(a) first interpolation signal generating means which generates a first interpolation signal for the present field by using a scanning line signal obtained within the present field;
(b) second interpolation signal generating means which generates a second interpolation signal for the present field by using scanning line signals of other fields;
(c) third interpolation signal generating means for generating a third interpolation signal for the present field, using a scanning line signal in another field preceding the present field;
(d) first mixing means for mixing said first interpolation signal generated by said first interpolation signal generating means and said third interpolation signal generated by said third interpolation signal generating means;
(e) second mixing means for mixing the second interpolation signal generated by said second interpolation signal generating means and the third interpolation signal generated by said third interpolation signal generating means;
and
(f) mixing ratio control means arranged to detect the correlativity of scanning lines among different fields and to control a mixing ratio in which the third interpolation signal is mixed by said first and second mixing means according to the correlativity detected.

4 more elements

(a) first interpolation signal generating means which generates a first interpolation signal for the present field by using a scanning line signal obtained within the present field;
(b) second interpolation signal generating means which generates a second interpolation signal by using at least a scanning line signal of another field;
(c) third interpolation signal generating means for generating a plurality of different third interpolation signals by utilizing at least either of said first and second interpolation signals;
(d) first correlativity detecting means for detecting correlativity between the scanning line signal of the present field and the scanning line signal of another field immediately preceding the present field;
(e) second correlativity detecting means for detecting correlativity between the scanning line signal of the present field and that of another field immediately ensuing the present field;
and
(f) output means for selectively producing one of the interpolation signals generated by said third interpolation signal generating means, one of the third interpolation signals being selected according to the results of detection made by said first and second correlativity detecting means.

4 more elements

Dependencies are inferred from the claim text.

Picture signal conversion device

Life of this patent

Picture signal conversion device

Life of this patent

Abstract

Claims31