Video decoder and decoding method which decodes a code string having a plurality of components which are arranged in a descending order of importance
First Claim
1. A video decoding method, comprising the steps of:
- receiving an encoded video stream including a code string including a synchronization code, a group of coded coding mode information, a group of coded motion vectors and a group of coded prediction error information, which are arranged in this order corresponding to a descending order of importance in decoding;
obtaining from the code string the group of coded coding mode information, the group of coded motion vectors, and the group of the coded prediction error information;
creating a prediction error signal for an image using one of the group of the coded prediction error information; and
combining the prediction error signal with a prediction signal for the image and producing a reconstructed video signal.
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Abstract
A video coding/decoding apparatus comprises a prediction circuit that divides an input video signal into large regions and small regions in a hierarchical fashion and produces a prediction signal by performing prediction region by region, a subtracter for generating a prediction error signal for a prediction signal at the lowest level, a DCT circuit for coding a prediction error signal, a quantization circuit and a variable-length encoder, a variable-length encoder for coding the prediction mode and motion vector information obtained at each level from the prediction circuit, and a multiplexer for multiplexing the code strings obtained from the variable-length encoder and dividing them into the upper-layer and lower-layer code strings to output the code strings obtained at the variable-length encoder particularly as upper-layer code strings.
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Citations
10 Claims
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1. A video decoding method, comprising the steps of:
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receiving an encoded video stream including a code string including a synchronization code, a group of coded coding mode information, a group of coded motion vectors and a group of coded prediction error information, which are arranged in this order corresponding to a descending order of importance in decoding; obtaining from the code string the group of coded coding mode information, the group of coded motion vectors, and the group of the coded prediction error information; creating a prediction error signal for an image using one of the group of the coded prediction error information; and combining the prediction error signal with a prediction signal for the image and producing a reconstructed video signal. - View Dependent Claims (2, 3)
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4. A video decoding method, comprising the steps of:
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receiving an encoded video stream including a code string including a synchronization code, a group of coded coding mode information, and a group of coded prediction error information, which are arranged in this order corresponding to a descending order of importance in decoding; obtaining from the code string the group of coded coding mode information, and the group of the coded prediction error information; creating a prediction error signal for an image using one of the group of the coded prediction error information; and combining the prediction error signal with a prediction signal for the image and producing a reconstructed video signal. - View Dependent Claims (5)
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6. A video decoding apparatus, comprising:
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means for receiving an encoded video stream including a code string including a synchronization code, a group of coded coding mode information, a group of coded motion vectors and a group of coded prediction error information, which are arranged in this order corresponding to a descending order of importance in decoding; means for obtaining from the code string the group of coded coding mode information, the group of coded motion vectors, and the group of the coded prediction error information; means for creating a prediction error signal for an image using one of the group of the coded prediction error information; and means for combining the prediction error signal with a prediction signal for the image and producing a reconstructed video signal. - View Dependent Claims (7, 8)
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9. A video decoding apparatus, comprising:
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means for receiving an encoded video stream including a code string including a synchronization code, a group of coded coding mode information, and a group of coded prediction error information, which are arranged in this order corresponding to a descending order of importance in decoding; means for obtaining from the code string the group of coded coding mode information, and the group of the coded prediction error information; means for creating a prediction error signal for an image using one of the group of the coded prediction error information; and means for combining the prediction error signal with a prediction signal for the image and producing a reconstructed video signal. - View Dependent Claims (10)
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Specification