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51. 发明授权

US5841474A High-efficiency encoder and video information recording/reproducing apparatus 失效
公开(公告)号：US5841474A
公开(公告)日：1998-11-24
申请号：US559488
申请日：1995-11-15
申请人： Tomohiro Ueda , Takashi Itow , Yoshinori Asamura , Ken Onishi , Hidetoshi Mishima
发明人： Tomohiro Ueda , Takashi Itow , Yoshinori Asamura , Ken Onishi , Hidetoshi Mishima
IPC分类号： G06T9/00 , G11B27/032 , G11B27/034 , G11B27/036 , G11B27/28 , H04N5/00 , H04N5/7826 , H04N5/926 , H04N5/928 , H04N7/24 , H04N7/26 , H04N7/36 , H04N7/46 , H04N7/50 , H04N7/52 , H04N9/804 , H04N9/806 , H04N9/83 , H04N9/835 , H04N1/36
CPC分类号： G11B27/032 , G11B27/036 , G11B27/28 , H04N19/105 , H04N19/114 , H04N19/137 , H04N19/142 , H04N19/146 , H04N19/172 , H04N19/177 , H04N19/179 , H04N19/42 , H04N19/46 , H04N19/503 , H04N19/577 , H04N19/61 , H04N19/87 , H04N21/23418 , H04N21/23424 , H04N21/236 , H04N21/2383 , H04N21/4135 , H04N21/4334 , H04N21/434 , H04N21/4382 , H04N21/44016 , H04N5/9262 , H04N5/9264 , H04N9/8042 , G11B2220/20 , G11B2220/90 , G11B27/034 , H04N19/107 , H04N19/152 , H04N5/78263 , H04N5/78266 , H04N5/928 , H04N9/8063 , H04N9/83 , H04N9/835 , H04N9/8355
摘要： In a high-efficiency encoder which performs motion-compensation prediction, an intra-field is set every n fields. The presence of a scene change is detected. When a scene change occurs, a reference picture of motion-compensation prediction is switched, or the field immediately after the scene change is set as an intra-field.

52. 发明授权

US5583573A Video encoder and encoding method using intercomparisons of pixel values in selection of appropriation quantization values to yield an amount of encoded data substantialy equal to nominal amount 失效
标题翻译：视频编码器和编码方法使用像素值的比较来选择专用量化值以产生大量等于标称量的编码数据量
公开(公告)号：US5583573A
公开(公告)日：1996-12-10
申请号：US385987
申请日：1995-02-09
申请人： Yoshinori Asamura , Takashi Itow , Tomohiro Ueda , Kenji Tsunashima , Satoshi Kurahashi
发明人： Yoshinori Asamura , Takashi Itow , Tomohiro Ueda , Kenji Tsunashima , Satoshi Kurahashi
IPC分类号： H04N5/7826 , H04N5/783 , H04N7/26 , H04N7/30 , H04N7/50 , H04N9/804
CPC分类号： H04N9/8047 , H04N19/102 , H04N19/115 , H04N19/117 , H04N19/124 , H04N19/126 , H04N19/14 , H04N19/142 , H04N19/15 , H04N19/154 , H04N19/176 , H04N19/18 , H04N19/51 , H04N19/60 , H04N19/61 , H04N19/85 , H04N19/88 , H04N19/13 , H04N19/146 , H04N19/152 , H04N19/30 , H04N19/91 , H04N5/78266 , H04N5/783 , H04N9/8045
摘要： When a digital video signal is compressed, the amount of resulting data is predicted and the quantization level is controlled so as to obtain a constant bit rate. The prediction is made by computing a linear combination of a standard deviation and a number of non-zero coefficients, or by computing a sum of absolute differences between adjacent pixel values, or by computing a dynamic range of pixel values. The bit rate can also be controlled by deleting high-frequency coefficients. To avoid image degradation, the quantization level can also be controlled according to the sensitivity of small image areas to quantization noise. Sensitivity is determined by dividing an area into subblocks, which may overlap, and calculating statistics in each subblock. To reduce the amount of computation required in motion estimation, chrominance motion vectors are derived from luminance motion vectors.
摘要翻译：当数字视频信号被压缩时，预测所得到的数据量，并且控制量化电平以获得恒定的比特率。通过计算标准偏差和非零系数的线性组合，或者通过计算相邻像素值之间的绝对差的和，或通过计算像素值的动态范围来进行预测。比特率也可以通过删除高频系数来控制。为了避免图像劣化，也可以根据小图像区域对量化噪声的灵敏度来控制量化级别。通过将区域划分成可以重叠的子块和计算每个子块中的统计量来确定灵敏度。为了减少运动估计所需的计算量，从亮度运动矢量导出色度运动矢量。

53. 发明授权

US5488482A High-efficiency encoder and video information recording/reproducing apparatus 失效
标题翻译：高效率编码器和视频信息记录/再现装置
公开(公告)号：US5488482A
公开(公告)日：1996-01-30
申请号：US30538
申请日：1993-03-12
申请人： Tomohiro Ueda , Takashi Iotow , Yoshinori Asamura , Ken Onishi , Hidetoshi Mishima
发明人： Tomohiro Ueda , Takashi Iotow , Yoshinori Asamura , Ken Onishi , Hidetoshi Mishima
IPC分类号： G06T9/00 , G11B27/032 , G11B27/036 , G11B27/28 , H04N5/7826 , H04N5/926 , H04N5/928 , H04N7/24 , H04N7/26 , H04N7/36 , H04N7/46 , H04N7/50 , H04N7/52 , H04N9/804 , H04N9/806 , H04N9/83 , H04N9/835 , H04N5/917
CPC分类号： H04N9/8042 , G11B27/032 , G11B27/036 , G11B27/28 , H04N19/105 , H04N19/114 , H04N19/137 , H04N19/142 , H04N19/177 , H04N19/179 , H04N19/42 , H04N19/46 , H04N19/503 , H04N19/577 , H04N19/61 , H04N19/87 , H04N5/9262 , H04N5/9264 , G11B2220/20 , G11B2220/90 , H04N19/107 , H04N19/146 , H04N19/152 , H04N5/78263 , H04N5/78266 , H04N5/928 , H04N9/8063 , H04N9/83 , H04N9/8355
摘要： In a high-efficiency encoder which performs motion-compensation prediction, an intra-field is set every n fields. The presence of a scene change is detected. When a scene change occurs, a reference picture of motion-compensation prediction is switched, or the field immediately after the scene change is set as an intra-field. In intra encoding mode, a digital video signal is encoded after dividing the digital video signal into subbands, and in predictive encoding mode, the digital video signal is encoded without dividing it into subbands.
摘要翻译：在执行运动补偿预测的高效编码器中，每n个场设定场内场。检测到场景变化的存在。当发生场景变化时，切换运动补偿预测的参考图像，或将场景改变之后的场设置为场内。在帧内编码模式中，数字视频信号在将数字视频信号划分成子带之后被编码，并且在预测编码模式中，数字视频信号被编码而不将其划分成子带。

54. 发明授权

US5204743A Coding apparatus 失效
公开(公告)号：US5204743A
公开(公告)日：1993-04-20
申请号：US631796
申请日：1990-12-21
申请人： Yoshiko Hatano , Yoshinori Asamura , Ken Onishi
发明人： Yoshiko Hatano , Yoshinori Asamura , Ken Onishi
摘要： A coding apparatus, in which each block having a plurality of picture elements with digital image signals is divided into a plurality of sub-blocks, and an appropriate quantization step or weighting factor is decided on the basis of the absolute value sum of difference of image signal level between adjacent picture elements in the sub-block, so that a digital image signal is reduced. Moreover, a coding apparatus, in which each block having a plurality of picture elements with digital image signals is divided into a plurality of sub-blocks, and an appropriate quantization step or weighting factor is decided on the basis of the maximum and minimum values of the image signals of the picture elements in the sub-block, so that a digital image signal is reduced. Accordingly, in the coding apparatus as above, the state of the image is recognized for every block, whereby a block whose degradation of image quality is hard to notice at the decoder side is quantized or subjected to weighting with low rate, that is, with large reduction rate, whereas a block whose degradation of image quality is conspicuous at the decoder side is quantized or subjected to weighting with high rate, i.e., with small reduction rate. As a result, the image quality of the background having little change in the signal is kept good.

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