Image signal coding system
First Claim
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1. A coding system for digitally encoding a motion video signal comprising:
- a video memory for storing a previously input signal as field signals obtained by dividing a frame of said previously input signal into a plurality of fields;
means for outputting at least one of a plurality of predictive signals which predict a change of the input signal to be encoded based on the signals stored in said video memory;
means for interpolating between at least two of the plurality of predictive signals and for providing an interpolated predictive signal which is different from other predictive signals;
means, operatively connected to said means for outputting and means for interpolating, for subtracting the interpolated predictive signal from the input signal and producing a predictive error signal therefrom;
means, responsive to said means for subtracting, for encoding the predictive error signal to develop an encoded predictive error signal;
means for decoding the encoded predictive error signal to produce a decoded predictive error signal; and
means for generating a reproduced video signal to be stored in said video memory based on the decoded predictive error signal and the predictive signal.
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Abstract
An adaptive blocking coding system selects an effective blocking of an input image signal to be encoded in accordance with the correlation between fields, even if motion is detected between the fields. The blocking patterns include an individual field blocking, a non-interlace blocking, a split blocking and an inverted split blocking. Further, the coding system searches for motion from both odd and even fields of a frame for producing a motion compensated prediction signal in order to provide high-efficient coding.
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Citations
6 Claims
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1. A coding system for digitally encoding a motion video signal comprising:
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a video memory for storing a previously input signal as field signals obtained by dividing a frame of said previously input signal into a plurality of fields; means for outputting at least one of a plurality of predictive signals which predict a change of the input signal to be encoded based on the signals stored in said video memory; means for interpolating between at least two of the plurality of predictive signals and for providing an interpolated predictive signal which is different from other predictive signals; means, operatively connected to said means for outputting and means for interpolating, for subtracting the interpolated predictive signal from the input signal and producing a predictive error signal therefrom; means, responsive to said means for subtracting, for encoding the predictive error signal to develop an encoded predictive error signal; means for decoding the encoded predictive error signal to produce a decoded predictive error signal; and means for generating a reproduced video signal to be stored in said video memory based on the decoded predictive error signal and the predictive signal. - View Dependent Claims (2, 3, 4, 5, 6)
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Specification