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| Magnetic reproducing system for a digital signal |
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| Dual polarization transmission system |
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| Method for clock pulse synchronization |
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Motion-adaptive interpolation method for motion video signal and device for implementing the same
| Details |
Inventors: Furukawa, Akihiro;
Assignee: NEC Corporation (JP)
Primary Examiner: Goldberg; E. A.
Assistant Examiner: Foster; Patrick W.
Attorney, Agent or Firm: Ostrolenk, Faber, Gerb & Soffen
A motion-adaptive interpolation method for a motion video signal includes the steps of computing a representative motion vector of a moving object by using a certain number of motion vectors, and implementing a modification of the representative motion vector such that a variation of the representative motion vector at a present frame period with respect to the representative motion vector at a previous frame period is limited to a predetermined range, thus increasing the number of the frames per unit of time by using the modified representative motion vector. Further, a device for implementing the motion-adaptive interpolation includes motion estimation circuitry for evaluating an estimated motion of the motion video signal. The motion estimation circuitry has a function to compute the representative motion vector by using original motion vectors, a function to implement a modification of the representative motion vector so as to limit its variation of a present representative motion vector with respect to a previous one, and a function to create a motion vector for motion-adaptive interpolation. Thus, it is possible to provide an excellent smooth movement reproduction and high resolution in the moving area within the frame of the motion video signal. |
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DETAILED DESCRIPTION In view of the above, an object of this invention is to provide a motion-adaptive interpolation method for a motion video signal and a device for implementing the same which can eliminate the above-mentioned drawbacks encountered in the prior arts.
Another object of this invention is to provide an improved picture quality of an interpolated picture.
A further object of this invention is to realize a synthesized interpolated motion picture having both plane continuity in a moving area and continuity of a motion in a time axis direction.
A still further object of this invention is to provide an excellent smooth movement reproduction and high resolution in the moving area within a frame of a motion video signal.
According to the present invention, there is provided a motion-adaptive interpolation method for a motion video signal, the method comprising the steps of detecting an n number of motion vectors (n is a positive integer) of a moving object as units of a certain number of picture elements from two successive frames of the motion video signal, computing an m number of representative motion vectors (m is a positive integer: m<n) representative of motion of the moving object by using the n number of motion vectors, implementing a modification of the representative vector such that a variation of the representative motion vector at a present frame period with respect to the representative motion vector at a previous frame period is limited to a predetermined range, and increasing the number of the frames per unit of time by using the modified representative motion vector.
The motion-adaptive interpolation method may comprise the steps of detecting an n number of motion vectors of a moving object as units of a certain number of picture elements from two successive frames of the motion video signal, computing a frequency distribution of the n number of motion vectors, evaluating an m number of representative motion vectors (m<n) representative of motion of the moving object from the frequency distribution of the n number of the motion vectors, implementing a modification of the representative vector such that a variation of the representative motion vector at a present frame period with respect to the representative motion vector at a previous frame period is limited to a predetermined range, and increasing the number of the frames per unit of time by using the modified representative motion vector
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