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VIDEO ENCODER CAPABLE OF DIFFERENTIALLY CODING SPEAKER'S VIDEO IMAGE AT PICTORIAL CALL AND VIDEO SIGNAL COMPRESSION METHOD USING THE SAME
VIDEO ENCODER CAPABLE OF DIFFERENTIALLY CODING SPEAKER'S VIDEO IMAGE AT PICTORIAL CALL AND VIDEO SIGNAL COMPRESSION METHOD USING THE SAME
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机译:能够在幻影通话中不同地编码说话人的视频图像的视频编码器和使用相同方法的视频信号压缩方法
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摘要
PROBLEM TO BE SOLVED: To provide a video encoder capable of performing differential coding by dividing a speaker's image when making a pictorial call.;SOLUTION: The video encoder includes a motion estimation portion for estimating motions of an individual from a video signal and calculating a motion vector, a speaker region detection portion for detecting a speaker's region indicating a contour of the speaker from the motion vector, a discrete cosine transform portion for calculating a discrete cosine transform coefficient by performing discrete cosine transform on a video signal outputted from the motion estimation portion, a face region detection portion for generating a differential quantization table by detecting a face region of the speaker from the speaker region by using the discrete cosine transform coefficient and dividing the face region and a non-face region, an adaptive bit rate control portion for variably setting a quantization step size for performing quantization based on the speaker's region, and a quantization portion for performing quantization on the discrete cosine transform coefficient by the quantization step size and the differential quantization table.;COPYRIGHT: (C)2004,JPO&NCIPI
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