Motion picture coding apparatus
First Claim
1. A motion picture coding apparatus comprising:
- first coding means for prediction-coding a high-resolution interlaced picture as a frame picture;
first local decoding means for decoding a coding result from said first coding means to obtain a high-resolution local decoded signal;
first prediction means for attaining a high-resolution predictive signal from the high-resolution local decoded signal;
converting means for converting the high-resolution interlaced picture to a low-resolution picture;
second coding means for coding the low-resolution picture signal;
second local decoding means for decoding a coding result from said second coding means to obtain a low-resolution local decoded signal;
up-sampling means for up-sampling the low-resolution local decoded signal;
second prediction means for attaining a low-resolution predictive signal from a signal up-sampled by said up-sampling means; and
selection means for selecting an optimal one of the low-resolution predictive signal and the high-resolution predictive signal, used when performing predictive coding, as the frame picture for each of even and odd fields,whereby a predictive signal is produced from the low-resolution predictive signal and the high-resolution predictive signal.
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Abstract
A motion picture coding apparatus for performing predictive coding on a high-resolution picture signal and coding a low-resolution picture signal obtained by converting the high-resolution picture signal. One field is thinned out from one frame of a picture by a field skip circuit, the other field is down-sampled by a down-sampling circuit 29, thereby forming a low-resolution picture. A low-resolution predictive signal, obtained by up-sampling the low-resolution picture by an up-sampling circuit, and a high-resolution predictive signal, which is produced from a high-resolution picture and corresponds to the thinned-out one field, are alternately combined by a predictor to form a predictive signal.
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Citations
5 Claims
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1. A motion picture coding apparatus comprising:
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first coding means for prediction-coding a high-resolution interlaced picture as a frame picture; first local decoding means for decoding a coding result from said first coding means to obtain a high-resolution local decoded signal; first prediction means for attaining a high-resolution predictive signal from the high-resolution local decoded signal; converting means for converting the high-resolution interlaced picture to a low-resolution picture; second coding means for coding the low-resolution picture signal; second local decoding means for decoding a coding result from said second coding means to obtain a low-resolution local decoded signal; up-sampling means for up-sampling the low-resolution local decoded signal; second prediction means for attaining a low-resolution predictive signal from a signal up-sampled by said up-sampling means; and selection means for selecting an optimal one of the low-resolution predictive signal and the high-resolution predictive signal, used when performing predictive coding, as the frame picture for each of even and odd fields, whereby a predictive signal is produced from the low-resolution predictive signal and the high-resolution predictive signal.
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2. A motion picture decoding apparatus comprising:
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first decoding means for prediction-decoding a coded signal of a high-resolution interlaced picture as a frame picture to obtain a high-resolution decoded signal; first prediction means for attaining a high-resolution predictive signal from the high-resolution decoded signal obtained by said first decoding means; second decoding means for decoding a coded signal of a low-resolution picture to obtain a low-resolution decoded signal; up-sampling means for up-sampling the low-resolution decoded signal obtained by said second decoding means; second prediction means for attaining a low-resolution predictive signal from an up-sampled signal attained by said up-sampling means; and means for applying at least one of the high-resolution predictive signal and the low-resolution predictive signal as a reference signal for each of even and odd fields in accordance with a prediction mode corresponding to the coded signal, when the coded signal of the high-resolution interlaced picture is prediction-decoded as a frame picture. - View Dependent Claims (3, 4)
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5. A method of coding and decoding a motion picture comprising:
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a coding process including;
the steps ofprediction-coding a high-resolution interlaced picture as a frame picture; decoding a coding result to obtain a high-resolution local decoded signal; attaining a high-resolution predictive signal from the high-resolution local decoded signal; converting the high-resolution interlaced picture to a low-resolution picture; coding the low-resolution picture signal to obtain a coding result; decoding the coding result to obtain a low-resolution local decoded signal; up-sampling means for up-sampling the low-resolution local decoded signal; attaining a low-resolution predictive signal from an up-sampled signal; and selecting an optimal one of the low-resolution predictive signal and the high-resolution predictive signal, used when performing predictive coding, as the frame picture for each of even and odd fields, whereby a predictive signal is produced from the low-resolution predictive signal and the high-resolution predictive signal; and a decoding process including;
the steps ofprediction-decoding the coded signal of the high-resolution interlaced picture as a frame picture to obtain a high-resolution decoded signal; attaining a high-resolution predictive signal from the high-resolution decoded signal; decoding a coded signal of a low-resolution picture corresponding to the high-resolution interlaced picture to obtain a low-resolution decoded signal; up-sampling means for up-sampling the low-resolution decoded signal; attaining a low-resolution prediction signal from an up-sampled signal; selecting at least one of the high-resolution predictive signal and the low-resolution predictive signal for each of even and odd fields in accordance with a prediction mode corresponding to the coded signal, when the coded signal of the high-resolution interlaced picture is prediction-decoded as a frame picture.
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Specification