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    • 2. 发明授权
    • Method to compensate for a fade in a digital video input sequence
    • 补偿数字视频输入序列中的褪色的方法
    • US6040875A
    • 2000-03-21
    • US046290
    • 1998-03-23
    • Charles E. BoiceJohn M. KaczmarczykAgnes Y. NgaiMichael P. Vachon
    • Charles E. BoiceJohn M. KaczmarczykAgnes Y. NgaiMichael P. Vachon
    • H04N5/265H04N7/26H04N7/50H04N9/74H04N5/14H04N7/12
    • H04N5/265
    • A method to compensate for a fade in a digital video input sequence is provided where the video input sequence is to be compressed according to the MPEG-2 video compression standard. The method comprises a first step of dividing each frame of a current frame into two fields. In a second step, each field of the current frame is divided into at least one field band. In a third step, the luminance and chrominance pixel values are individually summed for the pixels in each field of the current frame. In a fourth step, the luminance pixel values are summed for the pixels in each field band of the current frame. In a fifth step, each respective field band sum and field sum of the current frame is compared with that of the previous frame in the video input sequence. In a sixth step, detection of whether or not a fade has occurred is provided, based upon the comparison in the fifth step. In a seventh step, the encoding algorithm is adjusted if a fade has occurred. Lastly, the first through seventh steps are repeated for at least one subsequent frame in the input video sequence.
    • 提供一种补偿数字视频输入序列中的褪色的方法,其中视频输入序列将根据MPEG-2视频压缩标准进行压缩。 该方法包括将当前帧的每帧划分成两个场的第一步骤。 在第二步骤中,当前帧的每个场被划分成至少一个场频带。 在第三步骤中,针对当前帧的每个场中的像素对亮度和色度像素值进行单独相加。 在第四步骤中,针对当前帧的每个场频带中的像素求和亮度像素值。 在第五步骤中,将当前帧的每个相应的场频和和和与视频输入序列中的前一帧的场和进行比较。 在第六步骤中,基于第五步的比较,提供是否发生褪色的检测。 在第七步中,如果发生褪色,则调整编码算法。 最后,对输入视频序列中的至少一个后续帧重复第一至第七步骤。
    • 6. 发明授权
    • On-chip dynamic buffer level indicators for digital video encoder
    • 用于数字视频编码器的片上动态缓冲器电平指示器
    • US06961378B1
    • 2005-11-01
    • US09186584
    • 1998-11-05
    • James D. GreenfieldJohn M. KaczmarczykAgnes Y. Ngai
    • James D. GreenfieldJohn M. KaczmarczykAgnes Y. Ngai
    • H04N7/26H04N7/32H04N7/46H04N7/50
    • H04N19/00H04N19/152H04N19/50H04N19/51H04N19/577H04N19/61
    • Method and encoder for encoding a digital video image stream. The encoding includes spatial compression of still images in the video stream and temporal compression between the still images. The spatial compression is carried out by converting a time domain image of a macroblock to a frequency domain image of the macroblock, taking the discrete cosine transform of the frequency domain image, transforming the discrete cosine transformed macroblock image by a quantization factor, and run length encoding the quantized discrete cosine transformed macroblock image. The temporal compression is carried out by reconstructing the run length encoded, quantized, discrete cosine transformed image of the macroblock, searching for a best match macroblock, and constructing a motion vector between them. This forms a bitstream of run length encoded, quantized, discrete cosine transform macroblocks and of motion vectors. This bitstream is passed to and through an external buffer to a transmission medium. The number encoded bits read by a host from the external buffer is fed back to the encoder for calculation in real time of a dynamic buffer level indicator indicative of the fullness of the external buffer. The encoder may generate a BUFFER—EMPTY flag, BUFFER—ALMOST—FULL flag and/or BUFFER—FULL flag for the host.
    • 用于对数字视频图像流进行编码的方法和编码器。 编码包括视频流中的静止图像的空间压缩和静止图像之间的时间压缩。 空间压缩通过将宏块的时域图像转换为宏块的频域图像,以频域图像的离散余弦变换为单位,将离散余弦变换的宏块图像变换为量化因子,运行长度 对量化的离散余弦变换宏块图像进行编码。 通过重建宏块的游程长度编码,量化,离散余弦变换图像,搜索最佳匹配宏块,并在它们之间构建运动矢量来执行时间压缩。 这形成游程长度编码,量化,离散余弦变换宏块和运动矢量的比特流。 该比特流被传递到外部缓冲器并传送到传输介质。 主机从外部缓冲器读取的编码比特数被反馈给编码器,用于实时地计算表示外部缓冲器的饱和度的动态缓冲器级别指示符。 编码器可以生成BUFFER EMPTY标志,BUFFER - ALMOST - FULL标志和/或BUFFER - FULL 标志为主机。