Frame rate conversion system in television signal
First Claim
1. A video frame rate conversion method for converting a first video signal having a first frame rate into a second video signal having a second frame rate differeing from said first frame rate, comprising:
- storing a first frame of said first video signal;
storing a second frame of said first video signal next succeeding first frame;
selecting a first picture block cell from said first frame of said first video signal, and a second picture block cell from said second frame of said first video signal, said second picture block cell corresponding to said first picture block cell and being moved in position relative said first picture block cell, by selecting video signals corresponding to said first picture block cell and said second picture block cell respectively from four adjacent lattice point cells enclosing each of said first and second picture block cells and calculating said first and second picture block cells respectively from said four adjacent lattice point cells enclosing each of said respective first and second picture block cells;
generating an interpolated frame temporally between said first and second frame of said first video signal, by performing an interpolation operation between said first picture block cell and said second picture block cell;
storing said interpolated frame in a frame memory; and
outputting said interpolated frame from said frame memory at said second frame rate as said second video signal.
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Abstract
A frame rate conversion, for instance between NTSC and PAL, or SECAM, has been improved by interpolation system in which an interpolation is performed from picture elements of two consecutive frames of an original picture signal whose positions are shifted from the position of a picture element to be interpolated by amounts related to the move length of a picture block between the two consecutive frames period, instead of using picture elements of two consecutive frames of the original signal that have the same position coordinates as those of the picture element to be interpolated. Picture quality of the converted signal is improved in particular when a picture moves.
49 Citations
2 Claims
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1. A video frame rate conversion method for converting a first video signal having a first frame rate into a second video signal having a second frame rate differeing from said first frame rate, comprising:
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storing a first frame of said first video signal; storing a second frame of said first video signal next succeeding first frame; selecting a first picture block cell from said first frame of said first video signal, and a second picture block cell from said second frame of said first video signal, said second picture block cell corresponding to said first picture block cell and being moved in position relative said first picture block cell, by selecting video signals corresponding to said first picture block cell and said second picture block cell respectively from four adjacent lattice point cells enclosing each of said first and second picture block cells and calculating said first and second picture block cells respectively from said four adjacent lattice point cells enclosing each of said respective first and second picture block cells; generating an interpolated frame temporally between said first and second frame of said first video signal, by performing an interpolation operation between said first picture block cell and said second picture block cell; storing said interpolated frame in a frame memory; and outputting said interpolated frame from said frame memory at said second frame rate as said second video signal.
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2. A video frame rate conversion system for converting a first video signal having a first frame rate into a second video signal having a second frame rate differing from said first frame rate, comprising:
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a first frame memory having a first calculating circuit for providing a first signal Xi-av.sbsb.x.sub., j-av.sbsb.y for a first frame of said first video signal, a second frame memory having a second calculating circuit for providing a second signal Xi+bv.sbsb.x.sub.,j+bv.sbsb.x.sub., for a second frame of said first video signal next succeeding said first frame; means for generating an interpolated frame temporally between said first frame and said second frame and providing an interpolation frame signal Yi, j according to said first signal and said second signal; a third frame memory for storing said interpolated frame; and means for outputting said interpolated frame from said third frame memory at said second frame rate for providing said second video signal at a frame rate converted from that of said first video signal; where i and j are values of a video frame scanning line number and a picture cell number respectively indicating two-dimensional coordinates, a and b are determined according to the length of time between said first and said interpolated frame and the length of time between said second frame and said interpolated frame and satisfy the relation a+b=1, and vx amd vy values representing the move quantity of a picture block cel per frame of said first video signal on the x and y coordinates respectively.
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Specification