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    • 10. 发明授权
    • Method and device for data encoding and method for data transmission
    • 用于数据编码的方法和装置以及用于数据传输的方法
    • US06628713B1
    • 2003-09-30
    • US09292650
    • 1999-04-15
    • Takashi KojimaHideki KoyanagiShigeto FunadoYoshihiro Murakami
    • Takashi KojimaHideki KoyanagiShigeto FunadoYoshihiro Murakami
    • H04B166
    • H04N19/142H04N5/147H04N19/179H04N19/59H04N19/87
    • The present invention generates coded data having always high image quality irrespective of the change amount of a picture. When a difference between two adjacent frames in inputted picture data is calculated as well as a motion vector between the above frames is calculated, and the picture data is encoded based on the difference and the motion vector between the above frames as well as the motion vector is encoded, a scene change in the above picture data is detected based on the difference between the two adjacent frames in the picture data, and the feature quantity of the picture data is calculated. If the above feature quantity exceeds a prescribed threshold value, the number of pixels of the picture data is reduced in a prescribed conversion ratio at the prescribed timing according to the detected scene change. And the picture data and the motion vector are encoded so as to be the amount of generating codes obtained by allotting the amount of signal of the motion vector representing the movement of the picture data reduced based on the picture data reduced in pixel, to the amount of signal of the picture data.
    • 本发明生成始终具有高图像质量的编码数据,而与图像的变化量无关。 当计算输入的图像数据中的两个相邻帧之间的差异并且计算上述帧之间的运动矢量时,并且基于上述帧之间的差和运动矢量以及运动矢量对图像数据进行编码 基于图像数据中的两个相邻帧之间的差异来检测上述图像数据中的场景变化,并且计算图像数据的特征量。 如果上述特征量超过规定的阈值,则根据检测到的场景变化,以规定的定时将图像数据的像素数减少为规定的转换比。 并且将图像数据和运动矢量编码为通过将表示基于像素中减少的图像数据而减少的图像数据的移动的运动矢量的信号量分配给所获得的生成代码的量, 的图像数据的信号。