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    • 5. 发明授权
    • Divisional image transmission system and method
    • 分区图像传输系统及方法
    • US4797742A
    • 1989-01-10
    • US14016
    • 1987-02-12
    • Fumio SugiyamaKenshi Dachiku
    • Fumio SugiyamaKenshi Dachiku
    • H04N19/00H04N7/04
    • H04N19/112H04N19/126H04N19/154H04N19/619H04N19/124H04N19/132H04N19/60
    • In an image transmitting system such that an image frame is divided into plural blocks and video signals are transformed block by block in accordance with an orthogonal transform method before coding and transmission of the transform coefficients, transform coefficients are coded, only when differences in transform coefficient between the preceding frame and the current frame are significant, to reduce the coding speed and therefore the video signal transmission speed. In addition, transform coefficients are weighted under consideration of human visual characteristics (the weighting is increased with decreasing order of transform coefficient). Further, when only differences in transform coefficient are coded and transmitted, it is possible to further reduce the transmission speed.
    • 在图像发送系统中,在编码和发送变换系数之前,根据正交变换方法,将图像帧分割为多个块,并且视频信号被逐块变换,变换系数仅在变换系数的差异 在前一帧和当前帧之间是显着的,以降低编码速度,从而降低视频信号的传输速度。 另外,在考虑人类视觉特征的情况下对变换系数进行加权(加权随着变换系数的降低而增加)。 此外,当只有变换系数的差异被编码和发送时,可以进一步降低传输速度。