Television – Image signal processing circuitry specific to television – Special effects
Patent
1998-01-16
2000-05-23
Harvey, David E.
Television
Image signal processing circuitry specific to television
Special effects
348578, H04N 5262
Patent
active
060671246
ABSTRACT:
When an image size is changed by using a linear interpolating process, a picture quality is improved so as not to overlap the position of an original signal and the position of an interpolation signal. An interpolation interval Vdp which is derived from an original image and an image size after the conversion is stored into a register of an input side and is accumulated and added by an adder from a register of an output side through a selector. A predetermined calculation is performed and an offset value q.sub.0 is obtained in a circuit. The value q.sub.0 is selected by the selector and the register of the output side is initialized for a vertical blanking period. Thus, a value (.delta.+nVdp) in which the value q.sub.0 was added to the accumulation value of Vdp is derived. On the basis of the value (.delta.+nVdp), a read address (n) of the original image and linear interpolation coefficients q.sub.n1 and q.sub.n2 are obtained. A similar process is also executed for the horizonal direction and an address (m) and coefficients p.sub.n1 and p.sub.n2 are obtained. A proper offset value is added to the interpolating position and the picture quality can be improved without overlapping the original signal and the interpolating position.
REFERENCES:
Booth, Kellog S. "Tutorial: Computer Graphics", IEEE Computer Society, 78 and 79, 1978.
Miyazaki Shinichiro
Ohno Takeshi
Shirahama Akira
Ueki Nobuo
Frommer William S.
Harvey David E.
Sony Corporation
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