Video encoder and portable radio terminal device using the video encoder
First Claim
1. A video encoder for encoding a motion picture signal, comprising:
- means for sequentially selecting one reference picture signal from a plurality of reference picture signals;
means for setting a center of search on a reference picture indicated by each of the reference picture signals sequentially selected;
means for setting, on the reference picture, a search range including the center of search;
means for performing block matching in the search range to search for a motion vector;
means for repeatedly performing, for a target block in the motion picture signal, selection of each of the reference picture signals, setting of the center of search, setting of the search range, and a search for the motion vector, thereby acquiring an optimal motion vector, the means then performing motion compensation on each of the reference picture signals sequentially selected, using the optimal motion vector, to generate a predicted picture signal; and
means for encoding a signal indicating a difference between the target block in the motion picture signal and the predicted picture signal, and side information, the means for setting the search range on a reference picture indicated by a last one of the reference picture signals sequentially selected, based on information related to the motion vector detected in the search range set on a reference picture indicated by a second last one of the reference picture signals.
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Accused Products
Abstract
A motion compensation predictor comprises a reference picture selection unit, a center-of-search-setting unit, a search-range-setting unit, a motion vector search unit and a motion compensation unit. The motion compensation unit repeatedly performs, for a target block in a motion picture signal, selection of a reference picture signal, setting of the center of search, setting of a search range, and a search for a motion vector, thereby acquiring an optimal motion vector. The unit then performs motion compensation on reference picture signals sequentially selected, using the optimal motion vector, to generate a predicted picture signal. The motion-vector-search unit sets the search range on a reference picture indicated by a currently selected reference picture signal, based on information related to a motion vector detected in the search range set on a reference picture indicated by a preceding reference picture signal.
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Citations
8 Claims
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1. A video encoder for encoding a motion picture signal, comprising:
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means for sequentially selecting one reference picture signal from a plurality of reference picture signals;
means for setting a center of search on a reference picture indicated by each of the reference picture signals sequentially selected;
means for setting, on the reference picture, a search range including the center of search;
means for performing block matching in the search range to search for a motion vector;
means for repeatedly performing, for a target block in the motion picture signal, selection of each of the reference picture signals, setting of the center of search, setting of the search range, and a search for the motion vector, thereby acquiring an optimal motion vector, the means then performing motion compensation on each of the reference picture signals sequentially selected, using the optimal motion vector, to generate a predicted picture signal; and
means for encoding a signal indicating a difference between the target block in the motion picture signal and the predicted picture signal, and side information, the means for setting the search range on a reference picture indicated by a last one of the reference picture signals sequentially selected, based on information related to the motion vector detected in the search range set on a reference picture indicated by a second last one of the reference picture signals. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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Specification