Processing apparatus for converting a scanning line number...

H - Electricity – 04 – N

Patent

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H04N 7/01 (2006.01) H04N 5/44 (2006.01)

Patent

CA 2134163

An apparatus of the present invention can achieve an improved image quality, irrespective of either a still image or a motion image to be obtained, when a scanning line number is converted. To this end, an interlaced scanning signal is input to a field delay circuit and to a vertical highpass filter, the output of the field delay circuit is input to a field delay circuit and to a vertical lowpass filter, and the output of the field delay circuit is input to a vertical highpass filter. The outputs of the vertical highpass filters are added together at an adder. The output of the adder is added by an adder to the output of the vertical lowpass filter to create an interpolation signal. The interpolation signal and direct-type signal, being time-compressed, is coupled to a switch where they are alternately selected. In this way, it is possible to create progressive scanning signals.

Appareil fournissant une image de meilleure qualité, qu'il s'agisse d'une image fixe ou d'une image en mouvement, lorsqu'un numéro de ligne de balayage est converti. € cette fin, un signal de balayage entrelacé est appliqué à un circuit d'excitation à retard et à un filtre passe-haut vertical, la puissance du circuit d'excitation à retard est appliquée à un circuit d'excitation à retard et à un filtre passe-bas vertical, et la puissance du circuit d'excitation à retard est appliquée à un filtre passe-haut vertical. La puissance combinée des filtres passe-haut verticaux est calculée au moyen d'un additionneur. La puissance de ce dernier est ajoutée, au moyen d'un additionneur, à la puissance du filtre passe-bas vertical pour créer un signal d'interpolation. Ce dernier et un signal de type direct, étant comprimés dans le temps, sont couplés à un sélecteur où ils sont sélectionnés en alternance. Il est ainsi possible de créer des signaux de balayage progressif.

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