Scanning conversion circuit

Details Scanning conversion circuit Scanning conversion circuit

2006-08-15

2006-08-15

Kostak, Victor R. (Department: 2614)

Television

Format conversion

Line doublers type

C348S448000

Reexamination Certificate

active

07092032

ABSTRACT:
A scanning conversion circuit which interpolates an image signal of an interpolation scanning line from an input image signal Vi of a scanning line adjacent to the upside or downside of an interpolation scanning line to output an image signal Vp doubled in scanning line, and which comprises a directivity detection unit (50) for detecting, in order to prevent an unnatural view of a slant line when a moving image is displayed with an image signal Vp, a direction having the strongest correlation out of a plurality of directions, including a vertical direction and a slant direction, centering on an interpolation point of an interpolation scanning line based on the signal Vi, and an average value computing unit (56) for computing an average value of image signals at two sampling points corresponding to the detected direction out of a plurality of sampling points in an upside scanning line and downside scanning line. When the directivity detection unit (50) judges that a slant-direction correlation is the strongest, the average value computing unit (56) computes an average value of image signals at corresponding and slant-direction two sampling points in an upside scanning line and downside scanning line to process the value as an image signal of an interpolation scanning line, thereby permitting a proper interpolation processing an a slant line in a moving image.

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