Picture decoding method and apparatus
    6.
    发明授权
    Picture decoding method and apparatus 失效
    图像解码方法及装置

    公开(公告)号:US06580830B1

    公开(公告)日:2003-06-17

    申请号:US09358032

    申请日:1999-07-21

    IPC分类号: G06K936

    摘要: An MPEG downdecoder is to be provided which eliminates dephasing of pixels of moving picture data without losing properties inherent in a picture obtained on interlaced scanning. In the case of a field DCT mode, 4×4 decimating IDCT is executed for phase correction for a ¼ pixel for pixels in the vertical direction of a top field and for phase correction for ¾ pixel for pixels in the vertical direction of a bottom field. In the case of a frame DCT mode, the totality of coefficients of a DCT block are IDCTed and separated into two pixel blocks associated with interlaced scanning. The low-frequency components of these two pixel blocks are IDCTed to synthesize the two pixel blocks. The pixels in the vertical direction of the top field are phase-corrected by a ¼ pixel, while those in the vertical direction of the bottom field are phase-corrected by a ¾ pixel.

    摘要翻译: 将提供一种MPEG降解编码器,其消除了运动图像数据的像素的去相位,而不会损失在隔行扫描中获得的图像中固有的特性。 在场DCT模式的情况下,对顶场的垂直方向上的像素的1/4像素执行4×4抽取IDCT,并且对于底场的垂直方向上的像素的¾像素进行相位校正。 在帧DCT模式的情况下,DCT块的系数的总和被IDCT化并分离成与隔行扫描相关联的两个像素块。 这两个像素块的低频分量被IDCTed以合成两个像素块。 顶场的垂直方向上的像素被1/4像素相位校正,而底场的垂直方向上的像素被¾像素相位校正。