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    • 63. 发明授权
    • Method for dual-standard coding of very low data-rate images and
coder-decoder for implementing this method
    • 用于实现该方法的用于非常低数据速率图像和编码器解码器的双标准编码的方法
    • US5459515A
    • 1995-10-17
    • US140128
    • 1993-11-08
    • Christophe ChevanceDominique Thoreau
    • Christophe ChevanceDominique Thoreau
    • H04N7/32G06T9/00H04N7/26H04N7/30H04N7/50
    • H04N19/423H04N19/103H04N19/112H04N19/124H04N19/152H04N19/176H04N19/44H04N19/60H04N19/61H04N19/107H04N19/13H04N19/146H04N19/30H04N19/91
    • A method for dual-standard coding of very low data-rate images and a coder-decoder system for implementing the method, wherein images can be transmitted with low spatial "Quarter of Common Intermediate Format" (QCIF) resolution and with high time resolution according to a first standard, or with high spatial "Common Intermediate Format" (CIF) resolution and low time resolution according to a second standard. In the method and system, the coding of the images includes calculating the mean value of the quantification steps used by a quantifier circuit, comparing the calculated mean value with a first predetermined threshold value and with a second predetermined threshold value higher than the first threshold value, and, chronologically, coding the images in the first standard when the mean value of the quantification steps is lower than the first predetermined threshold value, then coding the images in the first standard as long as the mean value of the quantification steps is lower than the second predetermined threshold value, then coding the images in the second standard as long as the mean value of the quantification steps is higher than the second predetermined threshold value, then coding the images in the first standard when the mean value of the quantification steps is lower than the first predetermined threshold value.
    • PCT No.PCT / FR93 / 00262 Sec。 371日期:1993年11月8日 102(e)日期1993年11月8日PCT 1993年3月16日PCT公布。 公开号WO93 / 19557 日期:1993年9月30日。一种用于实现该方法的非常低数据速率图像的双标准编码方法和用于实现该方法的编码器 - 解码器系统的方法,其中图像可以以低空间“公共中间格式”(QCIF) 根据第一标准具有高分辨率和高时间分辨率,或者根据第二标准具有高空间“通用中间格式”(CIF)分辨率和低时间分辨率。 在该方法和系统中,图像的编码包括计算由量化器电路使用的量化步骤的平均值,将计算的平均值与第一预定阈值和高于第一阈值的第二预定阈值进行比较 ,并且按照时间顺序,当量化步骤的平均值低于第一预定阈值时对第一标准中的图像进行编码,然后只要定量步骤的平均值低于第一标准,对第一标准中的图像进行编码 第二预定阈值,然后对第二标准中的图像进行编码,只要量化步骤的平均值高于第二预定阈值,则当定量步骤的平均值为 低于第一预定阈值。
    • 65. 发明授权
    • Derivation of frame/field encoding mode for a pair of video macroblocks
    • 推导一对视频宏块的帧/场编码模式
    • US08687696B2
    • 2014-04-01
    • US12223434
    • 2007-01-31
    • Dominique ThoreauFranck HironYannick Olivier
    • Dominique ThoreauFranck HironYannick Olivier
    • H04N7/26
    • H04N19/577H04N19/112H04N19/139H04N19/16H04N19/176H04N19/513H04N19/61
    • The method wherein the field or frame mode is selected according to the following steps: determination of a motion vector associated with a co-located macroblock of a macroblock to be coded and finding in the next reference picture, a predefined macroblock to be coded, for the selection, in field or frame mode, scaling of the motion vector according to the temporal distances between the reference pictures corresponding to this motion vector and between the current picture, field or frame, according to a predefined mode and a reference picture chosen from among the reference pictures corresponding to this motion vector, determination of the temporal macroblock in the chosen reference picture, designated by the motion vector scale attributed to the macroblock to be coded, and its field or frame coding mode, selection of field or frame coding mode of the temporal macroblock for the coding of the current macroblock. The applications relate to the compression of data using for example the MPEG4 part 10 standard.
    • 根据以下步骤选择场或帧模式的方法:确定与要编码的宏块的同位置宏块相关联的运动矢量,并在下一个参考图像中查找要编码的预定义宏块,用于 在场或帧模式中,根据预定义的模式和从以下的参考图像中选择的参考图像,根据与该运动矢量对应的参考图像与当前图像,场或帧之间的时间距离,运动矢量的缩放 对应于该运动矢量的参考图像,由归因于要编码的宏块的运动矢量标度指定的所选参考图像中的时间宏块的确定及其场或帧编码模式,场或帧编码模式的选择 用于当前宏块的编码的时间宏块。 这些应用涉及使用例如MPEG4第10部分的数据压缩数据。